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• PHP: Can pcntl_alarm() and socket_select() peacefully exist in the same thread?

  - by DWilliams

  I have a PHP CLI script mostly written that functions as a chat server for chat clients to connect to (don't ask me why I'm doing it in PHP, thats another story haha). My script utilizes the socket_select() function to hang execution until something happens on a socket, at which point it wakes up, processes the event, and waits until the next event. Now, there are some routine tasks that I need performed every 30 seconds or so (check of tempbanned users should be unbanned, save user databases, other assorted things). From what I can tell, PHP doesn't have very great multi-threading support at all. My first thought was to compare a timestamp every time the socket generates an event and gets the program flowing again, but this is very inconsistent since the server could very well sit idle for hours and not have any of my cleanup routines executed. I came across the PHP pcntl extensions, and it lets me use assign a time interval for SIGALRM to get sent and a function get executed every time it's sent. This seems like the ideal solution to my problem, however pcntl_alarm() and socket_select() clash with each other pretty bad. Every time SIGALRM is triggered, all sorts of crazy things happen to my socket control code. My program is fairly lengthy so I can't post it all here, but it shouldn't matter since I don't believe I'm doing anything wrong code-wise. My question is: Is there any way for a SIGALRM to be handled in the same thread as a waiting socket_select()? If so, how? If not, what are my alternatives here? Here's some output from my program. My alarm function simply outputs "Tick!" whenever it's called to make it easy to tell when stuff is happening. This is the output (including errors) after allowing it to tick 4 times (there were no actual attempts at connecting to the server despite what it says): [05-28-10 @ 20:01:05] Chat server started on 192.168.1.28 port 4050 [05-28-10 @ 20:01:05] Loaded 2 users from file PHP Notice: Undefined offset: 0 in /home/danny/projects/PHPChatServ/ChatServ.php on line 112 PHP Warning: socket_select(): unable to select [4]: Interrupted system call in /home/danny/projects/PHPChatServ/ChatServ.php on line 116 [05-28-10 @ 20:01:15] Tick! PHP Warning: socket_accept(): unable to accept incoming connection [4]: Interrupted system call in /home/danny/projects/PHPChatServ/ChatServ.php on line 126 [05-28-10 @ 20:01:25] Tick! PHP Warning: socket_getpeername() expects parameter 1 to be resource, boolean given in /home/danny/projects/PHPChatServ/ChatServ.php on line 129 [05-28-10 @ 20:01:25] Accepting socket connection from PHP Notice: Undefined offset: 1 in /home/danny/projects/PHPChatServ/ChatServ.php on line 112 PHP Warning: socket_select(): unable to select [4]: Interrupted system call in /home/danny/projects/PHPChatServ/ChatServ.php on line 116 [05-28-10 @ 20:01:35] Tick! PHP Warning: socket_accept(): unable to accept incoming connection [4]: Interrupted system call in /home/danny/projects/PHPChatServ/ChatServ.php on line 126 [05-28-10 @ 20:01:45] Tick! PHP Warning: socket_getpeername() expects parameter 1 to be resource, boolean given in /home/danny/projects/PHPChatServ/ChatServ.php on line 129 [05-28-10 @ 20:01:45] Accepting socket connection from PHP Notice: Undefined offset: 2 in /home/danny/projects/PHPChatServ/ChatServ.php on line 112

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• How to get an ARM CPU clock speed in Linux?

  - by MiKy

  I have an ARM-based embedded machine based on S3C2416 board. According to the specifications I have available there should be a 533 MHz ARM9 (ARM926EJ-S according to /proc/cpuinfo), however the software running on it "feels" slow, compared to the same software on my Android phone with a 528MHz ARM CPU. /proc/cpuinfo tells me that BogoMIPS is 266.24. I know that I should not trust BogoMIPS regarding performance ("Bogo" = bogus), however I would like to get a measurement on the actual CPU speed. On x86, I could use the rdtsc instruction to get the time stamp counter, wait a second (sleep(1)), read the counter again to get an approximation on the CPU speed, and according to my experience, this value was close enough to the real CPU speed. How can I find the actual CPU speed of given ARM processor? Update I found this simple Pi calculator, which I compiled both for my Android phone and the ARM board. The results are as follows: S3C2416 # cat /proc/cpuinfo Processor : ARM926EJ-S rev 5 (v5l) BogoMIPS : 266.24 Features : swp half fastmult edsp java ... #./pi_arm 10000 Calculation of PI using FFT and AGM, ver. LG1.1.2-MP1.5.2a.memsave ... 8.50 sec. (real time) Android # cat /proc/cpuinfo Processor : ARMv6-compatible processor rev 2 (v6l) BogoMIPS : 527.56 Features : swp half thumb fastmult edsp java # ./pi_android 10000 Calculation of PI using FFT and AGM, ver. LG1.1.2-MP1.5.2a.memsave ... 5.95 sec. (real time) So it seems that the ARM926EJ-S is slower than my Android phone, but not twice slower as I would expect by the BogoMIPS figures. I am still unsure about the clock speed of the ARM9 CPU.

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• "Learning" Linux

  - by Strider

  I've been interested in computers for a long time and have fiddled with a lot of stuff which includes Linux. I started out with Red Hat when I was young (around 13) and lost all data, converting a FAT32 drive to something else. Later it was Knoppix which was really helpful in recovery and such. Then, it was Ubuntu. Also, I fiddled with Arch for some time, but, it breaks too often for my liking (maybe, I should have been more careful). Anyway, currently I use Ubuntu 9.04. I want to dig deeper into the Linux world now. I want to learn how things work and use the terminal more. I am a programmer as well, so, it will help a lot. So, the thing I wanted to ask were: Good books to learn and understand Linux Good habits to use Linux more efficiently. Good tools about which I should know. Amount of time you set aside to learn about new things each day. As a programmer, how do you setup and use Linux efficiently. Long list. I will be grateful to the answerers.

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• Google Chrome not loading web pages correctly unless multiple refreshes

  - by Brandon Wilson

  Webpages in Google Chrome do not load correctly from time to time. I can't reproduce it, it just happens. Some times it happens when I load the browser other times it happens when I am just browsing. Just now I went to five different web sites which 3 out of 5 of them did not load correctly. I have attached a photo of how Super User loaded the first time I loaded it. If I refreshed it it will load correctly. Facebook is bad like this. Some times Facebook will load correctly but some of there back end scripting may not load so the page may not refresh automatically. Not sure what is going on. I have tried other browsers (Firefox and Internet Explorer) and they seem to be working correctly. Chrome seems to be acting up only on this computer. All my computers are running Windows 8 and I have removed Chrome completely off this computer and re-installed. I even disabled all extensions and cleared all the caches. I even tried running Chrome without being logged in. Not sure what else to do at this point. An example of superuser.com not loading correctly: When I refresh the problem will go away until it happens again. Sometimes it takes two or three refreshes in order for it to correctly load.

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• Graphics and USB devices freezing soon after OS loads

  - by Andrew

  I run Ubuntu/Windows dual boot. Last night I started the upgrade to Ubuntu 12.04, and my computer has not worked since in either Windows or Ubuntu. Here's what I got when I rebooted after the upgrade, and continue to get every time I boot: Gets to GRUB screen OK. Choose Ubuntu - black screen or crazy purple lines. At first I assumed something went wrong with the upgrade (often happens). Choose Windows - works fine, I log in, but soon after that the graphics freeze (sometimes with purple artifacts). The keyboard and mouse (both USB) also lose power at the same instant, and none of the USB ports have power to them. This happens sooner or later every time I boot. Update: the HDD also appears to lose power at the same point. I have tried a live CD, but my computer refuses to boot any CD even after disabling all other boot options in the BIOS. I have disconnected everything except keyboard, mouse, graphics card with one monitor, one RAM sick and HDD; no change. I also took the little battery out to reset CMOS. I am pretty sure no matter how wrong the Ubuntu upgrade went, it wouldn't cause the above symptoms in Windows. So the only explanation I can think of is that a hardware failure occurred at the same time. Some possible causes of this I can think of are: A couple of days before this, I added a third screen (which worked fine). About a week before, my house lost power in a storm (no ill effects over the past few days though). What can I do, other than buy a new motherboard/CPU and hope it works? Unfortunately I don't have another box to swap parts into to test at the moment.

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• Why is Windows Update trying to install an update I don't need?

  - by Oliver Salzburg

  I have a Windows 7 system that currently has a single update pending: Windows Internet Explorer 9 for Windows 7 for x64-based Systems If I try to install the update, Windows Update will: Create a restore point Fail with the error: Code 9C48 Windows Update encountered an error. The event log for the event reads: Installation Failure: Windows failed to install the following update with error 0x80070643: Windows Internet Explorer 9 for Windows 7 for x64-based Systems. If you search the web for that error, there are many other people with the exact same issue. Sadly, I am unable to apply the proposed solutions to my case, because I just installed this system. There is nothing on it, except Windows 7. I installed the system and ran through the updates. I also did the exact same process with this machine several times over the past few days due to a long-term test we just started. I didn't have any problems with any Windows Update on the previous installation runs and I know I didn't do anything different this time because I followed the installation procedures instructions which are to be used during the test. How did this happen and how do I solve it? Further Investigation So, as I always like to do, I ran the update again while running Process Monitor and dug up further details. WindowsUpdate.log First of all, there is a Windows Update log file located at C:\Windows\WindowsUpdate.log which I didn't know about. But I fail to see any significant entry in it, maybe you're more lucky: 2012-04-10 22:46:58:017 956 728 AU AU received approval from Ux for 1 updates 2012-04-10 22:46:58:017 956 728 AU AU setting pending client directive to 'Progress Ux' 2012-04-10 22:46:58:095 956 728 AU BeginInteractiveInstall invoked for Download 2012-04-10 22:46:58:095 956 728 AU Auto-approving update for download, updateId = {B33ACEC1-3265-4D01-9C37-AC0892E95ED9}.100, ForUx=1, IsOwnerUx=1, HasDeadline=0, IsMinor=0 2012-04-10 22:46:58:095 956 728 AU Auto-approved 1 update(s) for download (for Ux) 2012-04-10 22:46:58:110 956 728 AU UpdateDownloadProperties: 0 download(s) are still in progress. 2012-04-10 22:46:58:110 956 728 AU ############# 2012-04-10 22:46:58:110 956 728 AU ## START ## AU: Download updates 2012-04-10 22:46:58:110 956 728 AU ######### 2012-04-10 22:46:58:110 956 728 AU # Approved updates = 1 2012-04-10 22:46:58:110 956 728 AU AU initiated download, updateId = {B33ACEC1-3265-4D01-9C37-AC0892E95ED9}.100, callId = {35DF928B-B428-4BAC-8C63-55295967EFBB} 2012-04-10 22:46:58:110 956 728 AU Setting AU scheduled install time to 2012-04-11 01:00:00 2012-04-10 22:46:58:110 956 728 AU Successfully wrote event for AU health state:0 2012-04-10 22:46:58:110 956 728 AU Currently showing Progress UX client - so not launching any other client 2012-04-10 22:46:58:110 956 bb8 DnldMgr ************* 2012-04-10 22:46:58:110 956 bb8 DnldMgr ** START ** DnldMgr: Downloading updates [CallerId = AutomaticUpdatesWuApp] 2012-04-10 22:46:58:110 956 bb8 DnldMgr ********* 2012-04-10 22:46:58:110 956 bb8 DnldMgr * Call ID = {35DF928B-B428-4BAC-8C63-55295967EFBB} 2012-04-10 22:46:58:110 956 bb8 DnldMgr * Priority = 3, Interactive = 1, Owner is system = 0, Explicit proxy = 0, Proxy session id = 1, ServiceId = {9482F4B4-E343-43B6-B170-9A65BC822C77} 2012-04-10 22:46:58:110 956 bb8 DnldMgr * Updates to download = 1 2012-04-10 22:46:58:110 956 bb8 Agent * Title = Windows Internet Explorer 9 for Windows 7 for x64-based Systems 2012-04-10 22:46:58:110 956 bb8 Agent * UpdateId = {B33ACEC1-3265-4D01-9C37-AC0892E95ED9}.100 2012-04-10 22:46:58:110 956 bb8 Agent * Bundles 1 updates: 2012-04-10 22:46:58:110 956 bb8 Agent * {6D9A90B7-FAF9-4A47-9EFE-A506264873B3}.100 2012-04-10 22:46:58:110 956 bb8 DnldMgr *********** DnldMgr: New download job [UpdateId = {6D9A90B7-FAF9-4A47-9EFE-A506264873B3}.100] *********** 2012-04-10 22:46:58:110 956 728 AU Successfully wrote event for AU health state:0 2012-04-10 22:46:58:110 956 728 AU # Pending download calls = 1 2012-04-10 22:46:58:110 956 728 AU ## RESUMED ## AU: Download update [UpdateId = {B33ACEC1-3265-4D01-9C37-AC0892E95ED9}, succeeded] 2012-04-10 22:46:58:313 956 bb8 Agent ** END ** Agent: Downloading updates [CallerId = AutomaticUpdatesWuApp] 2012-04-10 22:46:58:313 956 bb8 Agent ************* 2012-04-10 22:46:58:313 956 718 AU ######### 2012-04-10 22:46:58:313 956 718 AU ## END ## AU: Download updates 2012-04-10 22:46:58:313 956 718 AU ############# 2012-04-10 22:46:58:313 956 718 AU Setting AU scheduled install time to 2012-04-11 01:00:00 2012-04-10 22:46:58:313 956 718 AU Successfully wrote event for AU health state:0 2012-04-10 22:46:58:313 956 718 AU Currently showing Progress UX client - so not launching any other client 2012-04-10 22:46:58:313 956 718 AU Successfully wrote event for AU health state:0 2012-04-10 22:46:58:313 956 aac AU Getting featured update notifications. fIncludeDismissed = true 2012-04-10 22:46:58:313 956 aac AU No featured updates available. 2012-04-10 22:47:00:107 956 aac AU BeginInteractiveInstall invoked for Install 2012-04-10 22:47:00:107 956 aac AU Auto-approving update for install, updateId = {B33ACEC1-3265-4D01-9C37-AC0892E95ED9}.100, ForUx=1, IsOwnerUx=1, HasDeadline=0, IsMinor=0 2012-04-10 22:47:00:107 956 aac AU Auto-approved 1 update(s) for install (for Ux), installType=1 2012-04-10 22:47:00:107 956 aac AU ############# 2012-04-10 22:47:00:107 956 aac AU ## START ## AU: Install updates 2012-04-10 22:47:00:107 956 aac AU ######### 2012-04-10 22:47:00:107 956 aac AU # Initiating manual install 2012-04-10 22:47:00:107 956 aac AU # Approved updates = 1 2012-04-10 22:47:00:107 956 aac AU ## RESUMED ## AU: Installing update [UpdateId = {B33ACEC1-3265-4D01-9C37-AC0892E95ED9}] 2012-04-10 22:47:13:773 2232 9fc Handler : WARNING: Exit code = 0x8024200B 2012-04-10 22:47:13:773 956 718 AU # WARNING: Install failed, error = 0x80070643 / 0x00009C48 2012-04-10 22:47:13:773 2232 9fc Handler ::::::::: 2012-04-10 22:47:13:773 2232 9fc Handler :: END :: Handler: Command Line Install 2012-04-10 22:47:13:773 2232 9fc Handler ::::::::::::: 2012-04-10 22:47:13:851 956 a7c Agent ********* 2012-04-10 22:47:13:851 956 a7c Agent ** END ** Agent: Installing updates [CallerId = AutomaticUpdates] 2012-04-10 22:47:13:851 956 718 AU Install call completed. 2012-04-10 22:47:13:851 956 a7c Agent ************* 2012-04-10 22:47:13:851 956 718 AU # WARNING: Install call completed, reboot required = No, error = 0x00000000 2012-04-10 22:47:13:851 956 718 AU ######### 2012-04-10 22:47:13:851 956 718 AU ## END ## AU: Installing updates [CallId = {FCFF2A5C-25AB-4FB9-AB2B-35C65CCA6A9F}] 2012-04-10 22:47:13:851 956 718 AU ############# 2012-04-10 22:47:13:851 956 718 AU Install complete for all calls, reboot NOT needed 2012-04-10 22:47:13:851 956 718 AU Setting AU scheduled install time to 2012-04-11 01:00:00 2012-04-10 22:47:13:851 956 718 AU Successfully wrote event for AU health state:0 2012-04-10 22:47:13:851 956 498 AU Getting featured update notifications. fIncludeDismissed = true 2012-04-10 22:47:13:851 956 498 AU No featured updates available. 2012-04-10 22:47:14:366 956 168 AU No featured updates notifications to show 2012-04-10 22:47:14:366 956 168 AU UpdateDownloadProperties: 0 download(s) are still in progress. 2012-04-10 22:47:14:366 956 168 AU Triggering Offline detection (non-interactive) 2012-04-10 22:47:14:366 956 168 AU AU setting pending client directive to 'Install Complete Ux' 2012-04-10 22:47:14:366 956 168 AU Changing existing AU client directive from 'Progress Ux' to 'Install Complete Ux', session id = 0x1 2012-04-10 22:47:14:366 956 168 AU Successfully wrote event for AU health state:0 2012-04-10 22:47:14:366 956 b78 AU ############# 2012-04-10 22:47:14:366 956 b78 AU ## START ## AU: Search for updates 2012-04-10 22:47:14:366 956 b78 AU ######### 2012-04-10 22:47:14:366 956 b78 AU ## RESUMED ## AU: Search for updates [CallId = {0198DD3A-D7B0-48F5-A77D-795F8A1BDCE8}] 2012-04-10 22:47:16:097 956 718 AU # 1 updates detected 2012-04-10 22:47:16:097 956 718 AU ######### 2012-04-10 22:47:16:097 956 718 AU ## END ## AU: Search for updates [CallId = {0198DD3A-D7B0-48F5-A77D-795F8A1BDCE8}] 2012-04-10 22:47:16:097 956 718 AU ############# 2012-04-10 22:47:16:097 956 718 AU No featured updates notifications to show 2012-04-10 22:47:16:097 956 718 AU Setting AU scheduled install time to 2012-04-11 01:00:00 2012-04-10 22:47:16:097 956 718 AU Successfully wrote event for AU health state:0 2012-04-10 22:47:16:097 956 718 AU Successfully wrote event for AU health state:0 2012-04-10 22:47:16:113 956 55c AU Getting featured update notifications. fIncludeDismissed = true 2012-04-10 22:47:16:113 956 55c AU No featured updates available. 2012-04-10 22:47:18:780 956 bb8 Report REPORT EVENT: {27479C66-E930-4F9C-AFF2-27EDD76DED8F} 2012-04-10 22:47:13:773+0200 1 182 101 {B33ACEC1-3265-4D01-9C37-AC0892E95ED9} 100 80070643 AutomaticUpdates Failure Content Install Installation Failure: Windows failed to install the following update with error 0x80070643: Windows Internet Explorer 9 for Windows 7 for x64-based Systems. 2012-04-10 22:47:18:780 956 bb8 Report CWERReporter::HandleEvents - WER report upload completed with status 0x8 2012-04-10 22:47:18:780 956 bb8 Report WER Report sent: 7.5.7601.17514 0x80070643 B33ACEC1-3265-4D01-9C37-AC0892E95ED9 Install 101 Unmanaged 2012-04-10 22:47:18:780 956 bb8 Report CWERReporter finishing event handling. (00000000) WU-IE9-Windows7-x64.exe The actual update that is executed is downloaded and stored at the following location: C:\Windows\SoftwareDistribution\Download\Install\WU-IE9-Windows7-x64.exe Executing that file manually, results in the following error message: IE9_main.log The IE9 installer/updater also creates an own log file located at C:\Windows\IE9_main.log For the update session in question, the installer logged: 00:00.000: ==================================================================== 00:00.016: Started: 2012/04/10 (Y/M/D) 23:10:53.897 (local) 00:00.032: Time Format in this log: MM:ss.mmm (minutes:seconds.milliseconds) 00:00.063: Command line: "C:\Windows\SoftwareDistribution\Download\Install\WU-IE9-Windows7-x64.exe" 00:00.078: INFO: Setup installer for Internet Explorer: 9.0.8112.16421 00:00.094: INFO: Previous version of Internet Explorer: 9.0.8112.16443 00:00.110: INFO: Checking if iexplore.exe's current version is between 9.0.6001.0... 00:00.125: INFO: ...and 9.1.0.0... 00:00.141: INFO: Maximum version on which to run IEAK branding is: 9.1.0.0... 00:00.156: ERROR: A newer version of Internet Explorer is already installed on the system. 00:00.188: ERROR: Internet Explorer version check failed. 01:03.789: INFO: Setup exit code: 0x00009C48 (40008) - A more recent version of Internet Explorer is installed. 01:03.820: INFO: Scheduling upload to IE SQM server: http://sqm.microsoft.com/sqm/ie/sqmserver.dll 01:03.852: INFO: SQM Upload returned 403 01:03.867: INFO: Cleaning up temporary files in: C:\Windows\TEMP\IE978E.tmp 01:03.883: INFO: Unable to remove directory C:\Windows\TEMP\IE978E.tmp, marking for deletion on reboot. 01:03.898: INFO: Released Internet Explorer Installer Mutex Which pretty much confirms what the error message says when executing the update manually; it's simply already installed or even obsolete because a newer version is installed. So, why does it try to keep installing the update? Possible solutions? Uninstalling Windows Internet Explorer 9 and manually installing the cached C:\Windows\SoftwareDistribution\Download\Install\WU-IE9-Windows7-x64.exe will result in the same error after applying all pending updates. Applying the FixIt for the issue You receive “0x80070643” or “0x643” error codes when you try to install .NET Framework updates through Windows Update or Microsoft Updates will not resolve the issue. Applying the suggested solution for the issue Error message when you try to install updates by using the Windows Update or Microsoft Update Web site: "0x80070003" will not resolve the issue. Running the FixIt Automatically diagnose and fix common problems with Windows Update does report having resolved issues with Windows Update, but didn't resolve the issue. Running the FixIt for the issue How to troubleshoot Windows Update or Microsoft Update when you are repeatedly offered an update does not resolve the issue. Neither with normal nor with aggressive settings.

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• PS/2 to USB adapter doesn't work with Model M keyboard

  - by mickburkejnr

  I bought a server about 3 months ago from a friend, and I have only had time to tinker with it in the last week. I noticed that this server doesn't have any PS/2 ports, which meant configuring it was near impossible. I don't have any USB keyboards in the house, I only have an IBM Model M keyboard (built 1994) and another IBM keyboard that was built circa 2001. Both of them have PS/2 connections. I bought an adapter off eBay, and when I used it with the Model M keyboard the three lights on the keyboard flashed for a split second, but then the keyboard is then unresponsive. I can bash away at the keys for ages and nothing will happen. The same applies to the later built IBM keyboard. What could I do to make the adapter work? I am getting the loan of a USB keyboard in two weeks time, but I'd like a more permanent solution without having to rely on getting the loan of a keyboard every time I have to perform maintenance on the server. And as I already have two keyboards which work fine and I like using, I don't really want to have to buy another keyboard just for use on the server.

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• XAMPP CURL not working!

  - by MiffTheFox

  Nope, it's not. Windows Vista Home Premium x32: Relevant section of php.ini: ; Windows Extensions ; Note that ODBC support is built in, so no dll is needed for it. ; Note that many DLL files are located in the extensions/ (PHP 4) ext/ (PHP 5) ; extension folders as well as the separate PECL DLL download (PHP 5). ; Be sure to appropriately set the extension_dir directive. ;extension=php_apc.dll ;extension=php_apd.dll ;extension=php_bcompiler.dll ;extension=php_bitset.dll ;extension=php_blenc.dll ;extension=php_bz2.dll ;extension=php_bz2_filter.dll ;extension=php_classkit.dll ;extension=php_cpdf.dll ;extension=php_crack.dll extension=php_curl.dll ;extension=php_cvsclient.dll ;extension=php_db.dll ;extension=php_dba.dll ;extension=php_dbase.dll ;extension=php_dbx.dll Proof it's not working: c:\users\miff>curl http://localhost/xampp/phpinfo.php | grep curl % Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed 100 62592 0 62592 0 0 1971k 0 --:--:-- --:--:-- --:--:-- 3319k <tr><td class="e">HTTP_USER_AGENT </td><td class="v">curl/7.16.3 (i686-pc-cygwin) libcurl/7.16.3 OpenSSL/0.9.8k zlib/1.2.3 libssh2/0.15-CVS </td></tr> <tr><td class="e">User-Agent </td><td class="v">curl/7.16.3 (i686-pc-cygwin) libcurl/7.16.3 OpenSSL/0.9.8k zlib/1.2.3 libssh2/0.15-CVS </td></tr> <tr><td class="e">_SERVER["HTTP_USER_AGENT"]</td><td class="v">curl/7.16.3 (i686-pc-cygwin) libcurl/7.16.3 OpenSSL/0.9.8k zlib/1.2.3 libssh2/0.15-CVS</td></tr> c:\users\miff>

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• Benefit of using multiple SIMD instruction sets simultaneously

  - by GenTiradentes

  I'm writing a highly parallel application that's multithreaded. I've already got an SSE accelerated thread class written. If I were to write an MMX accelerated thread class, then run both at the same time (one SSE thread and one MMX thread per core) would the performance improve noticeably? I would think that this setup would help hide memory latency, but I'd like to be sure before I start pouring time into it.

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• Is there a way to reuse an XmlReader?

  - by uriDium

  I have a process that uses an XmlReader. I have already done a lot to squeeze maximum performance out of it. So far we have had huge gains from using the Reader as opposed to XmlDoc or DataSet.GetXml(). We expect to get XML many times a second and I would like to avoid the overhead of recreating the reader every time. I have already cached the XmlReaderSettings but is there anyway to reuse the XmlReader or do I need to recreate it every time?

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• Intermittent CNAME forwarding

  - by Godric Seer

  I host a personal website on an old desktop that is LAMP based. Since I have a dynamic IP, I use no-ip to make sure I have a working domain name at all times. I also have a domain I have bought on GoDaddy where I have a CNAME record forwarding the www subdomain to my no-ip domain. At all times, I can connect to my website through the no-ip domain without issue. For the past several weeks, I never had an issue using the GoDaddy domain to connect (ssh or https). As of today, however, the GoDaddy domain only works for about 10 minutes at a time. I get server not found errors most of the time. Also, if I happen to be using the GoDaddy domain for an ssh connection, the connection will freeze. I have attempted to run tests using a couple of online DNS check websites, but have not gotten any errors at any time. I also contacted GoDaddy support but they had no issues connecting to the website, and therefore did not see any issues. I would like advice on how I could debug/resolve this issue. Since the problem appeared without me changing anything on my end, I hope it will resolve itself, but knowing the cause in case it happens again would be preferable. EDIT: I changed the configuration in GoDaddy to create an A (Host) that points at my current IP. This works fine, so I can access the site through the GoDaddy domain without the preceding www. I am currently waiting for a new CNAME record to propagate that points the www subdomain at the main host, rather than my no-ip domain.

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• Sending and Parsing JSON in Android

  - by primal

  Hi, In the application I am developing, I would like to send messages in the form of JSON objects to a Django Server and parse the JSON response from the server and populate a custom listview. From the little JSON knowledge I have, I thought this format for the response from server { "post": { "username": "someusername", "message": "this is a sweet message", "image": "http://localhost/someimage.jpg", "time": "present time" }, } How much knowledge of JSON should I have to accomplish this purpose? Also it would be great if someone could provide me links of some tutorials for sending and parsing JSON Objects.

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• Passing existing cookie to Web service

  - by danny.lesnik

  HI have the following scenario: 1) i'm authenticated against some aSP.NET web site and my session time out expires in 24 hours. 2) after several time I would like to run query against asp.net Web Service located on the site using existing authentication. What should I add to cookie Container? I how do sent existing cookie to Web service? Thank you in Advance. Danny.

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• Best CPUs for speeding up compiling times of C++ w/ DistGCC

  - by Jay

  I'm putting together a distributed build farm with DistGCC to speed up our teams compile times and just looking for thoughts on which processors to use in the hosts. Are we going to get a noticeable decrease in time using 8 cores vs. 4-hyperthreaded cores? Big difference in time between i7 and Xeon? etc, etc. Just need advice from people who've put together kick-a build clusters. We've got a majority of the normal things to speed up builds in place (pre-compiled headers, ccache, local gigabit connections between them, tons of ram, etc) so please just give advice on the best processor to use. And money is a factor, but anythings doable if the performance increase is noticeable. Thanks. Jay EDIT: Although any advice IS welcome, please refrain from "Do this first" posts as we're not planning on skimping on things like SSD, maxed out RAM, etc. My personal system is a iMac Quad-core i5 with 8GB of RAM. When I build our project locally, my processor floats around 99-100% a majority of the time, which makes me assume it is a bottleneck, even if you made everything else faster. My ram on the other hand doesn't even get close to maxing out. It's also worth noting that I did research this, however every discussion I could find was primarily for gaming machines, which is obviously a different beast in usage. These machines won't even have monitors or anything but integrated graphics since they have one purpose: Build freakin fast. (hopefully)

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• Best CPUs for speeding up compiling times of C++ w/ DistGCC

  - by Jay

  I'm putting together a distributed build farm with DistGCC to speed up our teams compile times and just looking for thoughts on which processors to use in the hosts. Are we going to get a noticeable decrease in time using 8 cores vs. 4-hyperthreaded cores? Big difference in time between i7 and Xeon? etc, etc. Just need advice from people who've put together kick-a build clusters. We've got a majority of the normal things to speed up builds in place (pre-compiled headers, ccache, local gigabit connections between them, tons of ram, etc) so please just give advice on the best processor to use. And money is a factor, but anythings doable if the performance increase is noticeable. Thanks. Jay EDIT: Although any advice IS welcome, please refrain from "Do this first" posts as we're not planning on skimping on things like SSD, maxed out RAM, etc. My personal system is a iMac Quad-core i5 with 8GB of RAM. When I build our project locally, my processor floats around 99-100% a majority of the time, which makes me assume it is a bottleneck, even if you made everything else faster. My ram on the other hand doesn't even get close to maxing out. It's also worth noting that I did research this, however every discussion I could find was primarily for gaming machines, which is obviously a different beast in usage. These machines won't even have monitors or anything but integrated graphics since they have one purpose: Build freakin fast. (hopefully)

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• Best CPUs for speeding up compiling times of C++ w/ DistGCC

  - by Jay

  I'm putting together a distributed build farm with DistGCC to speed up our teams compile times and just looking for thoughts on which processors to use in the hosts. Are we going to get a noticeable decrease in time using 8 cores vs. 4-hyperthreaded cores? Big difference in time between i7 and Xeon? etc, etc. Just need advice from people who've put together kick-a build clusters. We've got a majority of the normal things to speed up builds in place (pre-compiled headers, ccache, local gigabit connections between them, tons of ram, etc) so please just give advice on the best processor to use. And money is a factor, but anythings doable if the performance increase is noticeable. Thanks. Jay EDIT: Although any advice IS welcome, please refrain from "Do this first" posts as we're not planning on skimping on things like SSD, maxed out RAM, etc. My personal system is a iMac Quad-core i5 with 8GB of RAM. When I build our project locally, my processor floats around 99-100% a majority of the time, which makes me assume it is a bottleneck, even if you made everything else faster. My ram on the other hand doesn't even get close to maxing out. It's also worth noting that I did research this, however every discussion I could find was primarily for gaming machines, which is obviously a different beast in usage. These machines won't even have monitors or anything but integrated graphics since they have one purpose: Build freakin fast. (hopefully)

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• remember the highlighted text in html page(add annotation to html page)

  - by ganapati hegde

  Hi, I have an HTML file, i am opening it with webkit,i want to develop an app, such that after opening it, i should be able to select some text and make it highlighted(say by pressing some button 'highlight text' ). And it should remember the highlighted text so that when i open it next time it should highlight the same text automatically...which information i got to store so that i can highlight the same in the next time ? any library is available which makes my work simple?

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• Webcam becomes "Unknown Device" after Windows Messenger 2011 is installed

  - by Boris

  I have Sony VAIO VGN-NS290J laptop. I installed Windows 7 Ultimate 64-bit. I was able to find drivers for all hardware without any problems. Recently, I installed Microsoft Windows Live Essentials 2011, i.e. Windows Live Messenger 2011. Ever since that application is running on my computer, my webcam is not recognized by the OS any more. It is listed as the "Unknown Device" and placed in the Universal Serial Bus controllers group in the Device Manager. There don't seem to be any drivers for this webcam. It's a standard Sony Motion Eye web camera and Sony does not offer any drivers for it. There is one application to download that utilizes the camera, but there are no drivers (and the system is showing the same behavior regardless of the presence of the application). It happens from time to time that the webcam becomes recognized by the OS again, after a couple of restarts; but not always. Then it becomes unknown again. I am absolutely positive that this issue is caused by the Windows Live Messenger 2011, because same symptoms caused the same effects before. I wish to be able to continue to use this software, but also to use my webcam. I was wondering if anyone had a similar issue and if there is a way to fix it. Thanks for all the help, I appreciate it. Update: I have discovered a pattern - if the camera goes astray, restarting the machine does not bring it back; but switching the computer off and turning it back on does. Every time! This is getting super complicated :)

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• NSTimer timestamp timeinterval question

  - by okami

  I have the following code: [NSTimer scheduledTimerWithTimeInterval:0.5 target:self selector:@selector(timerCount:) userInfo:nil repeats:YES]; -(void)timerCount:(NSTimer *)timer { NSTimeInterval dt = [timer timeInterval]; // do something } The NSTimeInterval I got will be 0.5, the time interval I've put on scheduledTimerWithInterval, this means the timerCount will be called each 0.5 seconds. But I now that there are some stuff as timeStamps, and I want to know if the NSTimer will call the timerCount method in PRECISELY 0.5 seconds each time.

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• How is spin lock implemented under the hood?

  - by httpinterpret

  This is a lock that can be held by only one thread of execution at a time. An attempt to acquire the lock by another thread of execution makes the latter loop until the lock is released. How does it handle the case when two threads try to acquire the lock exactly the same time? I think this question also applies to various of other mutex implementation.

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• Why my 2nd ip from traceroute is not answering the ping anymore?

  - by Pedro77

  My Internet is really laggy today, I did a tracerout and I realize that I'm having no answer from an ip at the beginning of the traceroute. see: Tracing route to 12.129.202.154 over a maximum of 30 hops 1 <1 ms <1 ms <1 ms 192.168.0.1 2 * * * Request timed out. 3 8 ms 8 ms 8 ms bd044008.virtua.com.br [189.4.64.8] 4 9 ms 8 ms 8 ms bd044009.virtua.com.br [189.4.64.9] 5 26 ms 26 ms 24 ms embratel-T0-1-5-0-tacc01.cas.embratel.net.br [200.174.243.21] 6 360 ms 15 ms 12 ms ebt-T0-15-0-12-tcore01.ctamc.embratel.net.br [200.244.140.218] 7 330 ms 349 ms 261 ms ebt-Bundle-POS11942-intl04.mianap.embratel.net.br [200.230.220.10] 8 139 ms 141 ms 139 ms sl-st30-mia-.sprintlink.net [144.223.64.221] Connection diagram: PC - Router configured as access point - Router (192.168.0.1) - Cable modem (192.168.100.1). Well, I think it is odd that the 2nd ip is not returning the ping. I looked some old tracerout logs to see what was the 2nd ip. The ip was: 10.19.0.1 So, what this 2nd ip stand for? How can I find why it is not answering the ping? I don't understand it, if does not answer the ping, how can the packets continue (yeah newbie question)? edit: well, because the hope 3 have a ping of 8 ms the hop 2 request time out should really not be a problem. But it is still odd that the 2nd hop stopped to answer ping request. So my doubts are: 1. Were the ip 10.19.0.1 is from? 2. Why it stopped to answer ping requests? 3. How can hop 7 be smaller than 6 and 8 smaller than 7 and 6!?? Shouldn't the pings be higher for each hop? Like: hop 3 time should be the sum of the hops before it plus its own time (hop 3 = 1+2+3) ??

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• Picking a linux compatible motherboard

  - by Chris

  Last time I bought a new computer (I build them myself) I got a motherboard that had really poor linux support for a long time. Specifically the audio. I had to wait months before the kernel supported the on board audio chipset. That is exactly the situation I'm trying to avoid this time around. I have some specific questions about "server motherboards" actually. I looked at a few models of server motherboards by intel, and some random models on newegg. I wasn't able to see much of a difference from regular desktop motherboard other than most had two sockets, and support for much more ram. These boards seem more popular with Linux users. Why? AMD and Intel both have server CPUs as well. Some question, what's the difference? To make this question more concrete, I was looking at this this motherboard. The main questions about it that I can't answer are: Can I get a motherboard without on board raid and audio? I wanted to get a hardware raid controller and a PCI audio card. I thought a server motherboard would be cheaper and not have these "extras", since who wants an audio card on a server? Where can I found out about Linux support for the components on this board? "Intel ICH10R", "Realtek ALC889", "Marvell 88E8056" I'm buying this computer to work as a Linux desktop for a lot of compiling, coding and audio/video work, but I don't want to rule out the possibility of installing windows and playing some games at one point. (even if the last game I got has been sitting in its box unopened for almost a year). Is it a good idea to buy a "server motherboard" and play games on it, or are desktop boards better value for this? The ultimate solution for me would be a motherboard that had GPL divers for onboard LAN, a single CPU socket, lots of PCI express and PCI. USB 3.0, and no fancy hard disk controllers since I'll be getting a separate one.

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• Process files in a folder that haven't previously been processed

  - by Paul

  I have a series of files in a directory that I need to carry an action out on using a script. Once the action is done, then I want to keep a log that the file has been processed, so that the next time the script is run, it does not attempt to carry out the action again. So lets say I can find all the files that should be processed like this: for i in `find /logfolder -name '20*.log'` ; do process_log $i echo $i >> processedlogsfile done So I have a file containing the logs I have processed, and my goal would be to modify the for loop such that these processed logs are not processed a second time. Doing a manual scan each time seems inefficient, particularly as the processedlogfiles gets bigger: if grep -iq "$i" processdlogfiles ; then continue; fi It would be good if these files could be excluded when setting up the for loop. Note that the OS in question is a linux derivative, a managment appliance, with a limited toolset (no attr command for example) and so no way to install additional utilities (well it is possible but not an option). Most common bash shell commands are available though. Also, the filenames and locations of the processed files must remain where they are - they can't be altered to reflect their processed status

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• Something very strange with network

  - by Rodnower

  Hello, I have Windows 7 and I have very strange thing with my network. Some time I was connected through wireless router and my IP was 192.168.2.103, router's IP was 192.168.2.1 and some other IP was 192.168.2.100. The last I get from page "active DHCP clients" of web interface of the router and from "wireless clients" I may to see that 192.168.2.100 not (!) belong to my MAC address. Router build by EDimax. So after that I disabled wireless function of the router and restarted it. In this time I had not ping to 192.168.2.1. Also I had not any other connection, not wireless nor cable, but (!) I still had ping to 192.168.2.100 and I not understand what this voodoo is... C:\Users\Andrey>ping 192.168.2.100 Pinging 192.168.2.100 with 32 bytes of data: Reply from 192.168.2.100: bytes=32 time<1ms TTL=128 Reply from 192.168.2.100: bytes=32 time<1ms TTL=128 Reply from 192.168.2.100: bytes=32 time<1ms TTL=128 Reply from 192.168.2.100: bytes=32 time<1ms TTL=128 Ping statistics for 192.168.2.100: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 0ms, Maximum = 0ms, Average = 0ms This is what I had: C:\Users\Andrey>ipconfig /all Windows IP Configuration Host Name . . . . . . . . . . . . : Andrey-PC Primary Dns Suffix . . . . . . . : Node Type . . . . . . . . . . . . : Hybrid IP Routing Enabled. . . . . . . . : No WINS Proxy Enabled. . . . . . . . : No Wireless LAN adapter Wireless Network Connection 3: Media State . . . . . . . . . . . : Media disconnected Connection-specific DNS Suffix . : Description . . . . . . . . . . . : Microsoft Virtual WiFi Miniport Adapter #2 Physical Address. . . . . . . . . : 06-1D-7D-40-61-EB DHCP Enabled. . . . . . . . . . . : Yes Autoconfiguration Enabled . . . . : Yes Wireless LAN adapter Wireless Network Connection: Media State . . . . . . . . . . . : Media disconnected Connection-specific DNS Suffix . : Description . . . . . . . . . . . : Gigabyte GN-WS50G (mini) PCI-E WLAN Card Physical Address. . . . . . . . . : 00-1D-7D-40-61-EB DHCP Enabled. . . . . . . . . . . : Yes Autoconfiguration Enabled . . . . : Yes Ethernet adapter Local Area Connection: Media State . . . . . . . . . . . : Media disconnected Connection-specific DNS Suffix . : Description . . . . . . . . . . . : Marvell Yukon 88E8055 PCI-E Gigabit Ethernet Controller Physical Address. . . . . . . . . : 00-1B-24-B6-09-91 DHCP Enabled. . . . . . . . . . . : Yes Autoconfiguration Enabled . . . . : Yes C:\Users\Andrey>arp -a -v Interface: 127.0.0.1 --- 0x1 Internet Address Physical Address Type 224.0.0.22 static 239.255.255.250 static Interface: 0.0.0.0 --- 0xffffffff Internet Address Physical Address Type 192.168.2.1 00-0e-2e-d2-8c-af invalid 192.168.2.255 ff-ff-ff-ff-ff-ff static 224.0.0.22 01-00-5e-00-00-16 static 224.0.0.252 01-00-5e-00-00-fc static 239.255.255.250 01-00-5e-7f-ff-fa static 255.255.255.255 ff-ff-ff-ff-ff-ff static Interface: 0.0.0.0 --- 0xffffffff Internet Address Physical Address Type 192.168.2.1 00-0e-2e-ff-f1-f6 dynamic 192.168.2.101 00-27-19-bc-8b-9c dynamic 192.168.2.102 00-16-e6-6c-ae-d4 dynamic 192.168.2.255 ff-ff-ff-ff-ff-ff static 224.0.0.22 01-00-5e-00-00-16 static 224.0.0.252 01-00-5e-00-00-fc static 239.255.255.250 01-00-5e-7f-ff-fa static 255.255.255.255 ff-ff-ff-ff-ff-ff static Interface: 0.0.0.0 --- 0xffffffff Internet Address Physical Address Type 224.0.0.22 01-00-5e-00-00-16 static 255.255.255.255 ff-ff-ff-ff-ff-ff static C:\Users\Andrey>route print =========================================================================== Interface List 14...06 1d 7d 40 61 eb ......Microsoft Virtual WiFi Miniport Adapter #2 13...00 1d 7d 40 61 eb ......Gigabyte GN-WS50G (mini) PCI-E WLAN Card 11...00 1b 24 b6 09 91 ......Marvell Yukon 88E8055 PCI-E Gigabit Ethernet Controller 1...........................Software Loopback Interface 1 =========================================================================== IPv4 Route Table =========================================================================== Active Routes: Network Destination Netmask Gateway Interface Metric 127.0.0.0 255.0.0.0 On-link 127.0.0.1 306 127.0.0.1 255.255.255.255 On-link 127.0.0.1 306 127.255.255.255 255.255.255.255 On-link 127.0.0.1 306 224.0.0.0 240.0.0.0 On-link 127.0.0.1 306 255.255.255.255 255.255.255.255 On-link 127.0.0.1 306 =========================================================================== Persistent Routes: None IPv6 Route Table =========================================================================== Active Routes: If Metric Network Destination Gateway 1 306 ::1/128 On-link 1 306 ff00::/8 On-link =========================================================================== Persistent Routes: None Only after reboot I lost ping to there: C:\Users\Andrey>ping 192.168.2.100 Pinging 192.168.2.100 with 32 bytes of data: PING: transmit failed. General failure. PING: transmit failed. General failure. PING: transmit failed. General failure. PING: transmit failed. General failure. Ping statistics for 192.168.2.100: Packets: Sent = 4, Received = 0, Lost = 4 (100% loss), So what this mysterious cache is? Thank you for ahead.

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• WTH? Upgrading Ubuntu 9.10 to 10.04 Problem: No Internet Connection?

  - by damx

  Earlier today I tried upgrading my Ubuntu 9.10 Karmic Kaola from the update manager. (FYI: all 9.10 updates were applied prior to this) Everything was going well downloading until I got an error dialog informing me that some software packages weren't downloaded because of an Internet connection. Would say it was halfway thru. Anyway, Was told that the software packages that it did download, however, would kept and I figure it's not a big deal. Just run it again. But first ran Firefox to verify my connection as I haven't had any connection problems. But my internet connection was/is fine as evident by this posting. With that cleared, I ran the update manager again, clicked on "Upgrade" and this time I received "Could not download the release notes. Please check your internet connection" huh? This is my first time dealing w/ Ubuntu and my first upgrade so I am hoping someone can help. Not sure what the problem can be. I am can surf the web w/ no problems. Please help. PS: There was no installing at any point. Just downloading. PSS: The software it managed to download the first time around is now visible in the update manager but don't think I should install as I see in the compiz description it's for v1:0.8-4-0ubuntu2 I figure it's designed for 10.04 and might ruin things further if I install

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