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• How to better copy&paste big files over RDP?

  - by WebMAOhist

  Recently I was making a few attempts to copy&paste a big (1.2 GB) file to remote computer over RDP. The remote computer is virtual testing machine with MS Windows Server 2008 Datacenter. First I tried to copy&paste before midnight when the transfer speed was limited by client computer ISP to 100 kB/s. So, it required a few hours and I was forced to cancel transfer since remote desktop became too unresponsive and sluggish (slow). So, I re-started it over midnight when my local transfer speed is over 4 GB/s 4MB/s (sorry for typo). So, my impression is that independently on speed (broadband) of copy&paste transfer the remote computer becomes sluggish while copying over RDP. At the same time downloading from internet doesn't make remote host sluggish. AFAIU, it is because clipboard of remote computer and so its memory becomes overloaded by transfer. How can I control (restrict) the usage of clipboard for specific process (pasting of file)? What are the possible way to control it? Update: After reading that slow speed of transfer is caused by encryption used for copy&pasting over RDP and since I believe I am more interested in overall efficiency: both the time, or rapidness, of getting file as well as possibility to work without waiting, I changed the question title from: How to control the usage of remote desktop clipboard usage for pasting a big file? to How to better copy&paste big files over RDP? For example, is it better to copy&paste one huge (zip) archive or unzip it and copy paste a folder with unzipped files? And more exactly I wanted to ask: What are possible ways to improve overall experience: the speed of transfer (i.e. availability of needed file) responsiveness of remote host (making remote coputer available for work before completion of copy&pasting)?

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• then an error occurred during the login process - Connection Error 233

  - by scott brunner

  We have SQL Server 2008 installed on 64Bit Windows Server 2003. When we try connect to the local SQL Server using SQL Server Management Studio at the console, we get the error: A connection was successfully established with the server, but then an error occurred during the login process. provider: Shared Memory Provider, error: 0 - No process is on the other end of the pipe. When we try TCP from same local SSMS to local server, we get the same error but intead of the pipe message its something like "connection forcibly closed". Now, here is the strange part - we CAN connect to this SQL Server from any other machine on the network using SSMS. - AND - WE CAN'T connect to ANY SQL Server from the problem server. So it seems the SQL Server instance is fine and accepting remote connections. However, the SSMS on that machine will not connect to any SQL Server even remotely. When we try an ADO.NET connection from C# remotely we can connect, run that same code on the console of the trouble server and we get the same errors. How can this be solved?

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• mod_fcgi in virtualmin: graceful kill fail, sending SIGKILL?

  - by mgjk

  Yesterday around 1am, our server ground to a crawl. This doesn't happen often, but I'm trying to get to the bottom of it. There is no unusual traffic volume, no unusual processes running, just all of the sudden the server started killing fcgid processes. [Thu Aug 02 01:17:32 2012] [warn] mod_fcgid: process 26460 graceful kill fail, sending SIGKILL ... for as many fcgid processes as we have... CPU idle fell to 0% and I/O seemed to take up most of the load. The issue lasted about 5 minutes. I suspect there was some swap activity, although I'm not sure if it was due to killed processes being swapped in to die, or if it was because some process ramped up memory usage faster than my process watching scripts can see them. The oom-killer wasn't triggered (at least it's not logged), so I think this was Apache for some reason restarting the processes. This is not regular, and nothing obvious appears in cron. Is there a normal Apache process which might cause this? We run dozens of different sites, and it was late at night, so volume was very, very low. (maybe 200 requests in a 10 minute period).

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• Could hybrid SSD + HDD be made with fixed internal partitions?

  - by Aaron

  I was pretty close to getting Seagate's Momentus XT but have been scared off by the many problems reported on forums and feedback sites, especially in Mac Book Pros. So I'm waiting for mk 2 with some extra flash and better reliablilty I'm assuming will come out this year. What would suit me better though is a 32+500 hybrid drive where I have more control over what is on the flash drive and what is on the disk drive. So there are 2 physical partitions within the one 2.5" hard drive enclosure which use different media internally (32GB for core files and 500GB for data and multimedia). The partitions would be locked so they can't be changed. - Or even better, the disk driver just makes them appear as two disks to the OS that share the same bus... Perhaps it's ok if the bios just sees the first drive until the OS is loaded. Is either of it technically possible? Obviously difficult to market outside of the enthusiast market. The SSD memory modules can be pretty small right, so they could even make them a card that plugs into a secondary connection on the enclosure. That would be good for computer builders as well as for upgrading and recoverability. Then future operating systems could recognise these system SSD drives and automatically install the OS + swap files on it. While placing document libraries on the larger data drive. While in the longer term HDD will probably disapear there will always be a trade off between speed, storage size and expense.

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• Why does Windows Event Log stop logging events before maximum log size is reached?

  - by Tuure Laurinolli

  I have a service that produces a lot of event log output. Currently the event log is configured to overwrite any old events to keep the log from ever getting full. We have also increased the event log size considerably (to about 600 MB). Recently the service started reporting errors to its clients, and the error message it was sending to its clients is "The event log file is full". How can this be, when event log is configured to overwrite as necessary? In our hurry to get the service back up we cleared the event log without saving its contents, but most likely it had not reached 600 MB yet, judging from sizes of some earlier log dumps. There is also MS KB entry 312571, which reports that a hot fix to a similar issue is available, but the the configuration that the fix applies to is not exactly the same we have. Specifically, the fix only applies if event logs are configured to never overwrite old events. I wonder if this has something to do with the fact that the log files apparently are memory-mapped. What happens if the system runs out of address space to map files to?

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• mod_fcgi produces random 500 Errors

  - by DmitrySemenov

  php 5.4.7 via mod_fcgi when I run the site sometimes it works, sometimes it crashed with 500 Internal Error, this is what I see in error.log everytime I run the script [Mon Sep 24 18:50:43 2012] [warn] [client 68.231.194.198] (104)Connection reset by peer: mod_fcgid: error reading data from FastCGI server [Mon Sep 24 18:50:43 2012] [error] [client 68.231.194.198] Premature end of script headers: api.php any ideas? vhost config: <VirtualHost :80> ServerAdmin [email protected] DocumentRoot "/home/www/sites/test.com/html/development" ServerName test.com ServerAlias www.test.com ErrorLog "/home/www/sites/test.com/logs/error_log" CustomLog "/home/www/sites/test.com/logs/access_log" common <IfModule mod_fcgid.c> <Directory /home/www/sites/test.com/html/development> Options +ExecCGI AllowOverride All AddHandler fcgid-script .php FCGIWrapper /home/www/php-fcgi-scripts/php-fcgi-starter .php Order allow,deny Allow from all </Directory> FcgidMaxRequestLen 1073741824 </VirtualHost> fcgi.d conf LoadModule fcgid_module modules/mod_fcgid.so # Use FastCGI to process .fcg .fcgi & .fpl scripts AddHandler fcgid-script fcg fcgi fpl # Sane place to put sockets and shared memory file FcgidIPCDir /var/run/mod_fcgid FcgidProcessTableFile /var/run/mod_fcgid/fcgid_shm IdleTimeout 300 BusyTimeout 300 ProcessLifeTime 7200 IPCConnectTimeout 300 IPCCommTimeout 7200 PHP_Fix_Pathinfo_Enable 1 php-fcgi-starter.php #!/bin/sh PHP_CGI=/usr/local/php547/bin/php-cgi PHP_INI=/etc/php547-fastcgi.ini export PHP_FCGI_TIMEOUT=1200 #export PHP_FCGI_CHILDREN=6 export PHP_FCGI_MAX_REQUESTS=1000 exec $PHP_CGI -c $PHP_INI

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• Advice on Computer Specs for overall development/general use machine

  - by Ender

  At the moment I am restricted to a laptop with 512MB of RAM, a 120GB HDD and a 1.5GHz Intel processor for all my development and general browsing needs, and as you can probably tell using it for anything modern is a painful experience. As a result I've decided to buy myself a new desktop computer, one that will stand the test of time and one that can be upgraded easily. Rather than build the machine myself I've decided to go through Dell as I've had good experiences with them when purchasing computers for my family. I've had my eye on this as it's got a good amount of RAM, has a decent-rated processor and isn't priced too badly. http://www1.euro.dell.com/uk/en/home/Desktops/inspiron-580/pd.aspx?refid=inspiron-580&s=dhs&cs=ukepp1&~oid=uk~en~20211~inspiron-580_d005827~~ Intel® Core™ i5 Processor 750 (2.66GHz, 8MB) Genuine Windows® 7 Home Premium 64bit - English Display Not Included ATI Radeon™ HD 5450 1GB DDR3 graphics 6144MB Dual Channel DDR3 [3x2048] Memory 1TB (7200rpm) SATA Hard Drive DVD +/- RW Drive (read/write CD & DVD) with DVD Burn software 1 year of coverage included with your PC McAfee® Security Centre - 15 Month Protection - English After the pain of using a slow laptop for all this time the main thing I want is speed. I may look to play a couple of basic games on it, nothing too powerful. Obviously I'll be doing some development on it too so it'll have to be able to handle the latest IDE's and Database tools like SQL Server pretty quickly. Finally, should I ever need to improve it I'd like to be able to add more RAM and change some of the parts. I wouldn't have thought this would be a problem but a few people I've spoken to have said that the amount of RAM the motherboard can handle isn't that great. Is this true? How long can I expect to be using this computer before it's too slow? Thanks in advance for the help.

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• VMware Workstation "Power off" and "Suspend" buttons are disabled. What is going on?

  - by Ed Norris

  I've been using an XP image for a few months now with no problems. Recently the power off and resume buttons were disabled and I'm not sure what happened to cause that. In addition, the menu items to do those functions are grayed out (like VM | Power | Power Off) I'm using VMware Workstation 6.5.3 on a Windows 7 64-bit host. The image is Windows XP 32-bit. There is plenty of free space and memory on the host and the CPU is not pegged. I am able to power off the image through its Start menu, but that's a workaround not a fix. Any suggestions? TIA EDIT: Well after manually shutting down the image then closing and reopening the image file (which I've done before) in preparation for reinstalling the tools as suggested below, it looks fine. The power off and suspend buttons are enabled and work. So what do I do with this question now? "Close and restart a few times and it may work" doesn't seem useful...

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• Server Crash Diagnosis...Are there any 'black box recorder' style programs available.

  - by columbo

  My redhat server is crashing every three weeks or so at 4:15am ish on Sunday mornings. (well it was sundays the last two have been Thursday mornings at 4:15ish) Looking at the logs (mysql, httpd, messages) there are no clues as to why. They just seem to stop. I ran a little script to take memory readings every 15 minutes and it too stops (with normal readings) at this time. The server is remote at a provider so I can only access it via the web. I use Plesk. It appears to be a set job or something that is causing the issue. I can see nothing in crontab. So my question is...has anyone else had this and can offer advice? Failing that. Does any one know of a way to get more detailed logging than that offered by the messages file? I was thinking of a black box style recording program or maybe something as simple as an option somewhere to increase the level of reporting in the messages log. Thanks

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• Poor performance on IIS7, only on Windows Server 2008, fine on Windows 7?

  - by user32005

  Hi, I'm new to IIS7 but have experience with other versions. I've been working on an application that works great in a dev environment (as always) but when I push it to a windows server 2008/IIS7 box performance takes a noticeable hit. The dev environment is Windows7/IIS7. The configuration in IIS is the same on the dev box as the server. I've tried all sorts of things to try and find a reason for this but I cant come to any conclusion. I've ruled out database problems on the live box as all data is cached after the first request. I've confirmed this to be true and made sure there is no additional database traffic. I've ruled out network issues with a combination of monitoring requests with fiddler and local debugging on the server. Whenever the code runs on the server there seems to be a performance issue. The server: Intel Core 2 Quad CPU Q6600 @ 2.40ghz with 2gb RAM. I know this is not fantastic but I was expecting it to at least perform as well as my dev environment (which is running much more on a lower spec). The CPU using peaks at under 60%, and memory usage is less than half of the available. I've enabled failed request tracing and most of the time is spent in a custom HttpModule, this module works to handle every request, I cant get any more detail as to what within the module may be causing the problem. Any ideas, I've been pulling my hair out for days now. Thanks

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• SSD for swap on Ubuntu server

  - by grs

  Currently I am reading SSD reviews and I wonder how much exactly I will benefit if I move the 24 GB swap from 7200rpm HDD to SSD. Does anyone implemented swap space on SSD? Is this generally good idea? On a side note: I read that ext4 has much better performance if the journal is on SSD. Anyone with such a setup? Thanks! Edit: Here I will answer the questions posted: Occasionally, relatively rare I am hitting the swap. I know what the swap is for and that is better to get more RAM. When the server begins to swap its performance degrades (not a surprise). The idea is if I have few memory hungry processes running, to improve the overall system performance at that time, using SSD for swap, instead of slower rotational media. At the end - I want to be able to login faster and check the server state during swapping, instead of waiting on the login prompt. And of what I see SSD is cheaper per GB than RAM. Would I have better server performance during swapping (as rare it is) using SSD compared to HDD? Where 10k or 15k rpm HDDs would rate in this scenario? Thank you all for your quick and prompt answers!

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• Performance decrease in every game and application

  - by Márk Vincze

  When I start a game, initially it runs smoothly, but after a couple of minutes, the performance gradually decreases to the point of being unplayable (1-2 FPS). The sound also starts to lag at this point. This does not happen every time I start my PC, usually exiting the game, rebooting, then starting the game again solves the problem, and I can play with perfect FPS for as long as I want. I could not find any deterministic reason when this happens and when doesn't. It happens in every game I tried (SWTOR, Diablo 3, Skyrim), and not even games, but simple applications like a browser or the Control Panel can get unusably slow. This is a brand new PC I bought three months ago, and this problem occurs since the first day I've been using it. Could you provide any advice how to further diagnose the problem? I tried to reinstall Windows, and tried different video card drivers, but it did not help. It would be important to know whether this is a hardware or software problem, because I can use the warranty if it is a hardware issue. (I did not want to return the PC yet, because I can't reproduce the issue deterministically.) Spec of the pc: Motherboard: ASROCK H61M-HVS CPU: INTEL Core i3-2120 3.30GHz 1155 BOX Memory: KINGMAX 4096MB DDR3 1333MHz KIT Video card: GIGABYTE GV-R685OC-1GD HD6850 1GB GDDR5 PCIE HDD: SEAGATE 500GB Barracuda 7200rpm 16MB SATA3 ST500DM002 I am using Windows 7 64 bit. Thanks a lot in advance!

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• MAMP Pro mysqld won't start on os x lion

  - by Mike

  getting a Start MySQL Failed error in the GUI.. when i attempt to start mysqld from the CLI i get the following error: ? /Applications/MAMP/Library/bin/mysqld 120623 23:12:47 [Warning] Setting lower_case_table_names=2 because file system for /Applications/MAMP/db/mysql/ is case insensitive 120623 23:12:47 [Note] Plugin 'FEDERATED' is disabled. 120623 23:12:47 InnoDB: The InnoDB memory heap is disabled 120623 23:12:47 InnoDB: Mutexes and rw_locks use GCC atomic builtins 120623 23:12:47 InnoDB: Compressed tables use zlib 1.2.3 120623 23:12:47 InnoDB: Initializing buffer pool, size = 128.0M 120623 23:12:47 InnoDB: Completed initialization of buffer pool 120623 23:12:47 InnoDB: highest supported file format is Barracuda. 120623 23:12:47 InnoDB: Waiting for the background threads to start 120623 23:12:48 InnoDB: 1.1.5 started; log sequence number 1595675 120623 23:12:48 [ERROR] /Applications/MAMP/Library/bin/mysqld: unknown option '--skip-locking' 120623 23:12:48 [ERROR] Aborting 120623 23:12:48 InnoDB: Starting shutdown... 120623 23:12:49 InnoDB: Shutdown completed; log sequence number 1595675 120623 23:12:49 [Note] /Applications/MAMP/Library/bin/mysqld: Shutdown complete i have deleted the mysql.pid file located at /application/mamp/tmp/mysql/mysql.pid and i still get the error above. I can't find where MAMP has set --skip-locking set, my.cnf doesnt have it anywhere. Activity monitor gives me a mysqld process running by me, and everytime i KILL the process both via Activity Monitor and via kill =9 pid it starts right back up.. Sampling the process points back to the MAMP mysqld.. wtf?! About to throw MAMP out the window and boot up a VM of CentOS =)

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• Is there a historical computer peripherals or accessories museum or even just a current list?

  - by zimmer62

  Thinking about all the unique and different peripherals I've owned over the years, from ISA capture cards, to parallel port controlled shutter glasses for 3d games. I've seen many many accessory or computer peripherals come and go. The nostalgia of these things is a lot of fun. I tried to find some sort of historical time-line or list but what mostly turned up is computers themselves. I'm more interested in the mice, scanners, the weird adapters that shouldn't exist, short run very rare products, strange devices from computer shows in the 80's and 90's... Hardware you might find in a geeks basement that would be completely useless now, but was the coolest thing around when it was new. An example would be a drawing tablet I had for my TI-99 computer, or the audio tape player accessory for a C64 which let you save files to audio tapes, An ISA card that did the same for PC's hooked up to a VCR. Remember that IBM-PC Jr upgrade kit, that added a floppy drive, more memory and the AT switch in the back? I'd love to find either a wiki, or a list that has already been assembled which contain many of these weird (or common) accessories. I've had so many over the years I suppose I could start a wiki here if such a list doesn't already exist.

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• Computer hangs at BIOS screen. Cannot enter setup

  - by d2jxp

  I have an HP Pavilion a6500f (it's a year out of warranty) and it's hanging on the blue HP BIOS screen. If I mash F10 while it's starting up, it will say "Entering Setup..." but I will see no results. It will hang there and not do anything. If I actually wait until I can see the screen and then hit F10, there's no response at all and the computer will sit at the BIOS menu. I've dusted and cleaned it out, reseated the memory, switched the RAM slots, and reset the CMOS battery using the reset jumper. I'm out of ideas. I'm pretty sure it's not a hard drive issue, since my problem is at the BIOS. After this post, I'll disconnect the hard drive and try to just boot without it. Anyone have any other ideas? Edit: Okay, so I tried disconnecting the hard drive and now I can get back into the BIOS. I reconnected it and I'm locked out again. So the problem is my hard drive.. I guess I should delete this post unless someone has any ideas as to what's wrong with the drive?

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• Linux boot - stop the kernel switching to a new framebuffer mode clearing output

  - by Avio

  I'm working on an embedded system (based onUbuntu 12.04 LTS) and I'm customizing its kernel. I'm having some problem with upstart, mountall and plymouth. Nothing unsolvable I suppose, but the real problem is that I can't diagnose properly what's going on because the kernel (or maybe plymouth) changes the video mode in the middle of the boot process. This completely wipes entire lines of log and prevents any debugging of kernel misconfigurations. My Grub2 config seems to be ok with: GRUB_CMDLINE_LINUX="" GRUB_CMDLINE_LINUX_DEFAULT="acpi=force noplymouth" GRUB_GFXMODE=1024x768x32 GRUB_GFXPAYLOAD_LINUX=keep Here is some relevant output of lspci: 00:00.0 Host bridge: Intel Corporation Mobile 945GSE Express Memory Controller Hub (rev 03) 00:02.0 VGA compatible controller: Intel Corporation Mobile 945GSE Express Integrated Graphics Controller (rev 03) 00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/GME, 943/940GML Express Integrated Graphics Controller (rev 03) And here is the relevant portion of my kernel configuration: CONFIG_AGP=y CONFIG_AGP_INTEL=y CONFIG_VGA_ARB=y CONFIG_VGA_ARB_MAX_GPUS=16 CONFIG_DRM=y CONFIG_DRM_KMS_HELPER=y CONFIG_DRM_I915=y CONFIG_DRM_I915_KMS=y CONFIG_VIDEO_OUTPUT_CONTROL=y CONFIG_FB=y CONFIG_FB_BOOT_VESA_SUPPORT=y CONFIG_FB_CFB_FILLRECT=y CONFIG_FB_CFB_COPYAREA=y CONFIG_FB_CFB_IMAGEBLIT=y CONFIG_FB_MODE_HELPERS=y CONFIG_FB_VESA=y CONFIG_BACKLIGHT_LCD_SUPPORT=y CONFIG_BACKLIGHT_CLASS_DEVICE=y CONFIG_VGA_CONSOLE=y CONFIG_VGACON_SOFT_SCROLLBACK=y CONFIG_VGACON_SOFT_SCROLLBACK_SIZE=640 CONFIG_DUMMY_CONSOLE=y CONFIG_FRAMEBUFFER_CONSOLE=y CONFIG_FRAMEBUFFER_CONSOLE_DETECT_PRIMARY=y CONFIG_FONT_8x8=y CONFIG_FONT_8x16=y CONFIG_LOGO=y CONFIG_LOGO_LINUX_MONO=y CONFIG_LOGO_LINUX_VGA16=y CONFIG_LOGO_LINUX_CLUT224=y Every other custom/stock kernel boot fine with that Grub2 config. What I would like to have is a single flow of messages on a single console (retaining one screen resolution) from the bootup logo till the login prompt. Does anybody know what I have to tweak to achieve this?

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• Connections to SSH and Samba suffer from heavy delay

  - by Till Helge Helwig

  There are a lot of questions about SSH connections being delayed, which usually can be fixed by disabling the DNS lookups. Unfortunately this doesn't seem to be my problem. Our development server is accessed via SSH and Samba. When opening a connection to the server (either SSH or Samba) it takes a very long time. Accessing a Samba share via Windows is basically impossible because there is a timeout. Using smbclient works, but takes ages. When opening a SSH connection I get immediately prompted for the password and after hitting Enter the terminal instantly shows the MOTD. Afterwards it takes about a minute for the prompt to appear. I watched the load of the server while connecting via SSH and Samba and could not find anything out of order. There is nothing out of the ordinary running and hogging up memory and CPU or something. I have no clue where this delay might come from. I already tried UseDNS no in sshd_config and proxy_dns = no in smb.conf, but to no avail. Any idea about what might cause this would be greatly appreciated!

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• Turn computer into DAS (Direct Attached Storage)

  - by Damon

  Can we build a direct attached storage by taking a computer/server, adding an HBA, and installing some appropriate software? We would use Debian as a host OS for both the DAS and the server. If so, what software do we use? And do we simply need a HBA for the DAS and the Server? Or do we need more hardware? The goal is to use an older server that does not have enough room for drives but does have ECC memory, server processors, redundant power supplies, dual nics, etc. Then find any boxes, server or not, the key being having enough room for 8-12 drives, fans, etc. and turning them into a DAS; build two of these DAS's and have them connected to the server. Eventually we want to have two servers using DRBD and associated services like heartbeat and pace maker to create an HA setup for our server(s) but that will take a long time to configure since I have no experience with anything related to DRBD (yet) and have a learning curve I have to get past, not to mention the additional cost of more hardware (two servers vs one).

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• Which CPU for XEN - LAMP testbed - Budget

  - by deploymonkey

  Dear serverfault knowledgeables, im in a decision dilemma right now, which I can't resolve due to lack of hands on experience. I need to build a testbed for basically virtualizing a LAMP application (os'ses not yet decided) including server side calculations. I'll opt for XEN since it seems better supported by cloud hosters at the moment. The hardware is for a proof of concept for a startup doing saas and might be used for closed live alpha/beta later on. After testing, the testbed might be a) deployed as a colocated white box server b) used as workstation Single socket is enough. We want to have ECC memory for reliability, this excludes most of the consumer line at intel. If intel CPU, then threaded cpu (HT) is preferred have at least 16 gig ram If justified by price and reliability is not too bad, a high quality desktop MB instead of a server MB would be worth a try It came down to the opteron 6128 vs. the xeon 5620 for me after a lot of research, but I don't necessarily have to be right. Which CPU is preferrable, concerning TCO (MB price, power requirements 24/7...) , Opteron 6128 or Xeon 5620? Which one offers better performance in real world applications? (Do You have any other suggestions I probably overlooked?) Thank You for Your consideration

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• Windows 7 starts getting sluggish over a few days

  - by munrobasher

  Myself and the other developer are running Windows 7 Enterprise 64 bit with 8GB RAM on different Gigabyte motherboards with Quad core Intel CPUs. Most of the time, it runs like a dream. We use VMware workstation a lot (hence the 8GB) and that works well. Except... now and then, after the PCs have been on for a few days, the whole system starts getting really sluggish doing certain tasks. The other's developer's system is far worse than mine with it taking up to a minute to launch IE. Today, mine has gone sluggish but nowhere near as bad. For example, normally when I click on a new tab in IE, it's instant. Today, there's an obvious delay. Right-clicking in this window to trigger iSpell is normally instant, right now it takes about five seconds. I've got resource monitor open on my second monitor and when I did that right-click, there was no obvious peak in CPU, disk or memory. A reboot does fix it so it does sound like a resource issue but haven't a clue what might be to blame. The two computers have similarities (same spec) but also differences (like motherboard, RAM & CPU models). So I guess the question is, any pointers on diagnosing why a PC is sluggish? What could cause such a right-click slow down in IE for example? It sounds like such a simple operation. NOTE: whilst typing this message alone, it was fine performance wise. I can click around the page no problem but right-click still is noticeable slow. Will reboot over lunch... Cheers, Rob.

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• Limited connections to Ubuntu 12.04 server

  - by Luis M. Valenzuela

  I'm having a weird problem with my server. The server is inside my network, connected to a 3com switch which is connected to the router that handles the internet connection. The main purpose of the server is to host a php application. What's happening is that user 1 to 15 in the private network have no problems connecting to the server, when user 16 tries to connect a time out comes out and is unable to connect to the server. It's not just to the php application, but to any service from the server. When the 15 users are using the application, the server doesn't even answer to ping. I haven't set any special limit in Apache's ini file or MySql and the firewall is being turned off because the server is only to give service to the internal network. Is there a parameter in any of the network's card conf. files that might me causing this ? Or should I suspect from the router's or switches configuration ? UPDATE. Tomorrow, I'm gonna do some test on the server modifying two kernel params in : /etc/sysctl.conf The settings are: net.core.somaxconn which has the limit on simultaneous network connections to the server and kernel.shmmax which controls the amount of memory the system can use for managing connections.

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• Help, my CentOS servers keep going down , No route to host after a random uptime

  - by user249071

  Hello , I have a couple of Centos linux servers, that have a very simple task, they run nginx + fastcgi for php , and some NFS mounts between them, readonly They have some RPC commands to start some downloading processes with wget, nothing fancy , from a main server, but their behavior is very unstable, they simply go down, we tried to monitor ram , processor usage, even network connections, they don't load up so much, max network connections up to... 250 max, 15% processor usage and memory , well, doesn't even fill up, 2.5GB from 8GB max , I have no ideea why can a linux server go down like that, they aren't even public servers, no domain names installed no public serving, for sites. The only thing that I've discovered was that if i didn't restart the network service every couple of hours or so... the servers were becoming very slow, starting apps very slow, but not repoting a high usage of resources...Maybe Centos doesn't free the timeout connections, or something like that...It's based on Red Hat right? I'm not a linux expert , but I'm sure that there are a few guys out there that can easily have an answer to this , or even have some leads to what i can do ... I haven't installed snort, or other things to view if we have some DOS attacks, still the scheduled script that restarts the network each hour should put the system back online, and it doesn't.... Thank you in advance

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• Measuring performance indicators on a cluster

  - by Aditya Singh

  My architecture is based on Amazon. A ELB load balancer balances POST requests among m1.large instances. Every instance has a nginx server on port 80 which distributes the requests to 4 python-tornado servers on backend which handle the request. These tornado servers are taking about 5 - 10ms to respond to one request but this is the internal compute time of every request. I want to put this thing on test and i want to measure the response time from ELB to upstream and back and how does it vary when the QPS throughput is increased and plot a graph of Time vs. QPS vs. Latency and other factors like CPU and Memory. Is there a software to do that or should i log everything somewhere with latency checks and then analyze the whole log to get the stuff out. I would also need to write a self-monitor which keeps checking the whole response time. Is it possible to do it with a script from within the server. If so, will it be accurate ?

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• Strange Behaviour with Unicode Characters in Windows

  - by open_sourse

  Ok, I do not know if this is a programming question, but it certainly is a technical one so I am asking it here. I was working on some internationalization stuff in my PHP code, and in order to ensure that my generated HTML shows up Unicode correctly based on the encoding and stuff I decided to add some Chinese text to my PHP page, which then echoes it into the browser to complete my test case. So I went into google and typed "Chinese", copied the first Chinese text that the search returned (which was ??/??). I then copied it into Notepad++ which is my editor, and to my surprise showed up as boxes similar to [][]/[][]. So I thought the encoding in Notepad++ was messed up and I changed the encoding to UTF-8 and UCS, neither worked. I did it fresh in a newly encoded file, still I got the boxes. The same content when I paste into Google and StackOverFlow (like I did in this posting) shows up correct Chinese! I even opened up Windows Clipboard Viewer and the content is represented in the Clipboard as boxes! I tried pasting it into Windows Explorer address bar and using to rename a file to, but I still get boxes. But it shows up correctly when pasted into my Chrome Browser address bar! Is this a Windows issue? Since I am able to paste it correctly in SO, the data in memory should be encoded correctly right? But if that is the case why does it show up as boxes in the Clipboard Viewer? I am confused here...By the way I am using Windows XP with SP3. (I am asking this question here, even if it is not programmatic, because it is preventing me from running my programming test cases..)

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• How to kill ostensibly immortal process?

  - by DeeDee

  I had some huge file transfers operating on an NFS mount. The server on which the mount point resided was carelessly rebooted, and now the server from which these large transfers were initiated seems to be bogged down by them. If I run top, I see the following: The first thing I tried was to run kill with each the -1 -2 -9 and -15 flags, and each of the process ids shown above in turn. This allowed me to proceed, but didn't kill the processes. The next thing I attempted was to reboot the server, but neither reboot nor shutdown -r now worked. When I ran shutdown -r now the standard broadcast message was sent out, but the sever did not reboot. I confirmed this by looking at the server uptime, which was 25 days. So now I'm a little stuck. I'm running these commands as root. EDIT: Here's another interesting tidbit: In top, I don't see that any other processes are using more than a fraction of a percent of memory or more than 5% of CPU. EDIT 2: output of /var/log/messages

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