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• RAID P410i and P812 performance issues

  - by Alexey

  I'm having much trouble with I/O performance of HP DL360 server with two RAID controllers - P410i and P812, Windows Server 2008, 36 GiB RAM and 16 x Intel Xeon x5550. The server runs a bunch of tasks producing heavy sequential I/O, and after about 20-30 minutes of intensive work it looks like the tasks are stuck, not using CPU and with enough free memory (so this cannot be a bottleneck). The same tasks were running quite well on the older server (Windows Server 2003, 4 x Intel Xeon, 12 GiB RAM). RAID cache is present, write-cache battery is installed. Cache is configured as 25% readahead/75% writeback. The swap file resides on the logical disk served by P410i and other logical disks are on P812. Can someone tell me what can be the matter of this? Is this a hardware problem or misconfiguration?

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• write-through RAM disk, or massive caching of file system?

  - by Will

  I have a program that is very heavily hitting the file system, reading and writing randomly to a set of working files. The files total several gigabytes in size, but I can spare the RAM to keep them all mostly in memory. The machines this program runs on are typically Ubuntu Linux boxes. Is there a way to configure the file system to have a very very large cache, and even to cache writes so they hit the disk later? I understand the issues with power loss or such, and am prepared to accept that. Crashing aside, in normal operation the writes should eventually reach the disk! Or is there a way to create a RAM disk that writes-through to real disk?

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• Understanding Asterisk Server features

  - by Arham Ali Qureshi

  I need to ask few question about Asterisk 1) Does ACL mean by Access Control list here ?If yes than how could i use it? >ip show user 6001 * Name : 6001 Secret : <Set> MD5Secret : <Not set> Context : DLPN_Admin Language : AMA flags : Unknown Transfer mode: open MaxCallBR : 384 kbps CallingPres : Presentation Allowed, Not Screened Call limit : 2147483647 Callgroup : 1 Pickupgroup : 1 Callerid : "test" <6001> ACL : No Sess-Timers : Accept Sess-Refresh : uas Sess-Expires : 1800 secs Sess-Min-SE : 90 secs RTP Engine : asterisk Codec Order : (ulaw:20,gsm:20) Auto-Framing: No 2) What is mean by "Require Call Token" in Asterisk Digium GIU on Create new User Panel 3) Is There any command from where i can get users VOICE MAIL password ? 4) What AMI or CLI command set call recording on or off for user ? and if i want that file to be stored on client computer not on server memory what could i do ?

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• Alternatives for heapdumps creation with higher performance than jmap?

  - by Christian

  Hi, I have to create heapdumps, which works nice with jmap. My problem is, that jmap takes very long to create the heapdump file. Especially when the heap is getting bigger ( 1GB) it is taking too long. One situation as example: When the server gets into trouble with the heapspace, I want to restart it automatically and create a heapdump before the restart. This works, but takes too long to write the heapdump. This way the server is down for too long. The heapdump creation takes longer than one hour. I know about -XX:+HeapDumpOnOutOfMemoryError, but most of the time I can find the memory problem before the exception is thrown by the jvm. Is there an alternative to jmap which writes the heapdumps faster? A special solution for the example above would also be appreciated. This question is a mix between programming and system-administration, but I think I'm at the right place here.

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• SQL Server 2008 No process is on the other end of the pipe

  - by Matt

  I've recently been having some issues with SQL Server 2008 on our server. We only have one website running at the moment, but it seems at random that the following error occurs. A connection was successfully established with the server, but then an error occurred during the pre-login handshake. (provider: Shared Memory Provider, error: 0 - No process is on the other end of the pipe.) I don't understand this error, or what's causing it. Any help would be appreciated. When this error does occur all it takes to fix it is to restart the MSSQLSERVER service. But I need to fix the underlying problem first.

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• Building a new PC, Installing XP, blue screen of death

  - by Tim

  I got a gigabyte barebones kit and am installing windows-XP(SP1) and the initial setup works, then it restarts and goes into the second phase of the setup. Then when installing components (I think that's what it says) it gets half way done and comes up with a blue screen saying IRQL_NOT_LESS_OR_EQUAL. BUT! I had gotten past that by installing windows-XP media center addition Now I am trying to install the drivers for my Asus ATI Radeon 5770 graphics card and I get another blue screen of death that doesnt give much info something about address x0000005. Would you think there is something wrong with something in my system or do you think if I got windows 7 that would take care of things? Sorry for probably not giving enough info. Here is what I have MotherBoard - Gigabyte S-series GA-H55M-S2(v) PSU - Ultra 500 watt atx HDD - Sata serial ATA Seagate Baracudda 7200 CPU - Intel i3 Memory - 4gig crucial Graphics Card - Asus ATI Radeon 5770 1Gig DDR5

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• Why is Latex so big?

  - by putmatrix

  On windows, MikTex comes in a DVD. It's several times bigger than a typical Linux distribution. This makes it impossible to carry Latex on a memory stick like I do with many other useful software. Why is it so big? I thought it was just a language or system, but I've never seen any programming language with gigabytes of libraries. It's just that there's a bad feeling when your Latex distribution takes up four gigabytes of space when you expect it to be more of, say, 200mb.

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• Bash Shell Hangs on ?+Tab-complete

  - by michaelmichael

  I often use tab completion in Bash when completing directories, but I find that it hangs for an unacceptable amount of time if I accidentally include a question mark in the directory. I'd like to know why and how to prevent it if possible. Here's the scenario: I start a command and use the ~ key to represent home: ls ~?Desktop/co Oops! I held down the Shift for a split-second too long. I had intended for ? to be /. But (oh no!) muscle memory has already kicked in. I've hit the Tab before I noticed the mistake. Now I'm stuck waiting for the shell to beep angrily at me. Usually a minute or two. What happened? Why did the question mark cause it to hang and eventually beep? Any way to stop it from hanging?

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• How to reliably take Java Heap Dumps?

  - by karlcyr

  My team is running into difficulties when trying to take good heap dumps triggered by OutOfMemoryErrors. For specific reasons we are currently taking the dumps with jmap called from a bash script instead of using the HeapDumpOnOutOfMemoryError flag. We're using a 64-bit 1.6 JVM with a heap size around 3 GB. Our heap dumps fail 90% of the time (guesstimate). Is there anything we can do to improve our odds of getting a clean heap dump we can use to troubleshoot memory problems? I have read that jmap had major issues in Java 1.4 but that those issues should be mostly addressed now.

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• My Mac is slow but don't know what's slowing it down

  - by duality_

  My Mac (Macbook Pro) is sometimes slow doing basic tasks, like browsing the web or something like that. If I open Activity Monitor, I have (maybe) one program that is about 10 % CPU, others are below 1 %. My CPU usage is not full. I still have more than 2 GB of free memory (out of 5 GB). There is no heavy I/O activity like copying files. My open programs are Google Chrome (6 tabs, none of which are in some way (flash, many DOM objects, Javascript) have IMO, except maybe Gmail), Activity Monitor, Finder, Sublime Text 2 (text editor) and iTerm (terminal). What is causing the slowdown? "Slow" being: taking time to write these characters (I press the keyboard keys but there is a delay before I see them on the screen), changing tabs or programs, etc.

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• Flash player, HD videos and games are choppy

  - by Aimad Majdou

  I have a problem with flash player. HD videos from Youtube or Vimeo and flash games do not play smoothly. I'm using Flash player 11, Windows 7 Sp1, and my graphic card is Intel GMA 4500. Device Manager shows me that all drivers are installed on my computer, so i don't have any problems with drivers. When I run Google chrome, Resource Monitor shows me 15% ~ 40 % of CPU Usage and 40% used Physical Memory, but when I watch a video on Youtube or play a Flash game, the Resource Monitor shows 70% - 90% CPU Usage. Also, when I run some HD Video (Frame width : 1920, Frame height : 1080) on my computer, Device Manager shows me 80% ~ 100% of CPU Usage. before I Reinstall Windows 7, HD Videos and flash games were play smoothly I hadn't any problem with them !! I hope all these informations are enough to answer my question.

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• How do TAB & SHIFT-TAB get reversed in Entourage?

  - by Daryl Spitzer

  In Microsoft Entourage, I can use Tab to move the highlighted selection from "Inbox" in the left-hand column: ...to the list of email in my inbox: And Shift-Tab returns the selection to the left-hand column again. But once-in-a-while when I return to Entourage (but never immediately after launching it), Tab and Shift-Tab are reversed. That is, I need to use Shift-Tab to move the highlighted selection to the list of email and Tab to return the selection to the left-hand column. I don't know what causes this, and I find it so annoying that I'll restart Entourage just to restore Tab and Shift-Tab to what my muscle-memory expects. What is causing them to get reversed, and can I un-reverse them without restarting Entourage?

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• magento on Zend Server (Win7) installation error

  - by czerasz

  I try to install magento for the first time. I've created the database with the name "project" in my C:\Zend\Apache2\conf\httpd.conf I added on the end: <Directory "C:\Zend\Apche2\htdocs\project"> Options Indexes FollowSymLinks AllowOverride All Order allow,deny Allow from all </Directory> in my ZendServer/Server Setup/Extensions: PDO_MySQL, simplexml, mcrypt, hash, GD, DOM, iconv, curl, SOAP are on in C:\Zend\ZendServer\etc\php.ini I set: safe_mode = Off ;<-- was set to off ... memory_limit = 512M; Maximum amount of memory a script may consume (128MB) After step "Configuration" of magento installation (with Use Web Server (Apache) Rewrites enabled) I get: Internal Server Error My database is full of tables (that schould be ok) My Zend Server shows: 27-Oct 06:55 6 Severe Slow Request Execution (Absolute) http://localhost/project/index.php/install/wizard/installDb/ Critical Open 27-Oct 06:55 4 Fatal PHP Error C:\Zend\Apache2\htdocs\project\lib\Varien\Db\Adapter\Pdo\Mysql.php Critical Open 27-Oct 06:55 5 Slow Function Execution curl_exec Warning Open 27-Oct 06:55 5 Slow Request Execution (Absolute) http://localhost/project/index.php/install/wizard/configPost/ What can be wrong?

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• Strange IIS/Asp.net Exception Message

  - by Element

  I have a standard asp.net 2.0 application running on IIS 6. I have noticed some strange exception messages in the logs. They seem to be caused by random spam bots trying to submit forms. They are strange because the request string is huge and all the exception details in the event manager are messed up, they have been replaced with %21,%22, etc.. as seen in the screen shot. Is this some kind of exploit or just a bug in the asp.net exception handler/logger ? UPDATE: I traced the requests that are causing this strange log event to a bug in IE8 that causes it to request scriptresource.axd?d={html from page} as described in these links: MS Connect SO - Invalid Webresource.axd SO - IE8 Dropping Memory Pages I am still not sure why these requests would break the IIS log event like seen above, they are just long strings of jiberish being sent to the server, maybe someone reading this can shed some light on it.

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• Ubuntu server very slow out of the blue sky (Rails, passenger, nginx)

  - by snitko

  I run Ubuntu server 8.04 on Linode with multiple Rails apps under Passenger + nginx. Today I've noticed it takes quite a lot of time to load a page (5-10 secs). And it's not only websites, ssh seems to be affected too. Having no clue why this may be happening, I started to check different things. I checked how the log files are rotated, I checked if there's enough free disk space and memory. I also checked IO rate, here's the output: $ iostat avg-cpu: %user %nice %system %iowait %steal %idle 0.17 0.00 0.02 0.57 0.16 99.07 Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn xvda 2.25 39.50 16.08 147042 59856 xvdb 0.00 0.05 0.00 192 0 xvdc 2.20 25.93 24.93 96530 92808 xvdd 0.01 0.12 0.00 434 16 xvde 0.04 0.23 0.35 858 1304 xvdf 0.37 0.31 4.12 1162 15352 Rebooting didn't help either. Any ideas where should I be looking?

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• How do I know if I have KMS enabled?

  - by Attila Oláh

  How can I check if KMS is enabled in my kernel? I've compiled mine with KMS radeon modeset defaulting to 1, but I still suspect that it is not enabled. EDIT: aatiis@aiur ~ $ dmesg | grep drm [drm] Initialized drm 1.1.0 20060810 [drm] Initialized radeon 1.33.0 20080528 for 0000:01:05.0 on minor 0 [drm] Setting GART location based on new memory map [drm] Loading RS780 CP Microcode [drm] Resetting GPU [drm] writeback test succeeded in 1 usecs EDIT 2: aatiis@aiur ~ $ glxinfo | grep render IRQ's not enabled, falling back to busy waits: 2 0 direct rendering: Yes OpenGL renderer string: Mesa DRI R600 (RS780 9612) 20090101 TCL aatiis@aiur ~ $ sudo grep -i kms /var/log/Xorg.0.log [ 57.201] (II) [KMS] drm report modesetting isn't supported.

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• Running programs in cache and registers

  - by OSX NINJA

  In my operating systems class we were shown a picture depicting a hierarchy of memory starting from most expensive and fastest at the top and least expensive and slowest at the bottom. At the very top was registers and underneath it was cache. The professor said that the best place to run programs is in cache. I was wondering why programs can't be run in registers? Also, how can a program load itself into cache? Isn't the cache something that's controlled by the CPU and works automatically without software control?

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• Tor Browser: how do I restart just the browser?

  - by GDR

  I'm using Tor Browser on Linux from time to time, but I close the browser because it has high memory usage, and leave Vidala running in background to help the network and relay traffic. The problem is, when I want to use Tor Browser again, I have to shut down Vidala and start it again. This takes time and has negative effect on the network. When I execute ./App/Firefox/firefox-bin, the browser starts but says it's not connected via Tor network. Any ideas how to start tor browser and make it connect to existing Vidala instance?

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• HP Probook 4530s great specs, but lagging. Hard Drive?

  - by Mark

  I have this laptop, which has a i3 processor, 4gb memory, 7200rpm hard drive. So there is nothing wrong with the specs. Even when I have no applications open, simply closing and opening windows, lags. Or opening the start menu, or dragging icons across the desktop. sometimes even the cursor lags. So I checked out the resource monitor, and the resources using disk activity are svchost Avast ------- my antivirus, but not much System (PID 4) ------ This is using a huge chunk The total disk activity fluctuates between %50 - %100

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• Have you ever used kon-boot?

  - by Ctrl Alt D-1337

  Has anyone here ever used kon-boot? I guess it may work because of the few blog posts about it but I feel kinda concerned and am interested at hearing experiences from anyone who have used multiple times with no side effects. I am slightly worried for any direct memory altering it tries to do. I am also worried if this will do its job fine to hide the fact it puts in a low level trojan or if the author planned to do anything like that in a future release as it looks like closed source from the site. Also I don't intend to gain illegal access but I find these sort of things very useful for my box of live discs I take every where, just in case. OT: Other question that me be of interest to readers here

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• STS 2.5.2 showing error error occurred during initialization of vm could not reserve enough space for object heap eclipse

  - by user1460079

  I am using STS2.5.5 with jdk 1.6 in my system with 32 BIT winx Xp it was working fine for few HRs when i installed it for the first time, after that when i restart STS it started showing exception Failed Initialize when i start the TC it throws hte exception error occurred during initialization of vm could not reserve enough space for object heap eclipse It is working fine in another system with same config, to resolve this if i delete STS and reinstall STS it works fine but again throws same error if i close STS and open it can anybody help me, i am also not able to change the size in my sts.ini if i increase memory and start STS then it will not start.

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• Good C++ books regarding Performance?

  - by Leon

  Besides the books everyone knows about, like Meyer's 3 Effective C++/STL books, are there any other really good C++ books specifically aimed towards performance code? Maybe this is for gaming, telecommunications, finance/high frequency etc? When I say performance I mean things where a normal C++ book wouldnt bother advising because the gain in performance isn't worthwhile for 95% of C++ developers. Maybe suggestions like avoiding virtual pointers, going into great depth about inlining etc? A book going into great depth on C++ memory allocation or multithreading performance would obviously be very useful.

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• Office 2011 Mac - Unable to save Word files, plus normal.dot alert errors

  - by Jeff D

  There are actually 3 errors here. When I open Word, I get: Word cannot open the existing global template. () If I create a file, type a character and try to save to the desktop (that I have no problems writing to otherwise), I get: Word cannot save or create this file. The disk may be full or write-protected. Try one or more of the following: * Free more memory * Make sure that the disk you want to save the file on is not full, write-protected, or damaged. () I am just saving to the desktop, and I can save excel files (or anything else) there. After the failure, if I save again, the default file name becomes: .doc...doc Weird. Finally, when I close word completely, I get: Do you want to replace the existing Normal.dotm.

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• Kernel config file generator

  - by lisak

  Hey guys, could please anybody recommend some kind of kconfig generator that would trim modules and built-in stuff that is not needed according to current hardware ? The best I have found is this : http://lkml.org/lkml/2008/9/16/290 I don't care about compilation time and the amount of modules that are not built-in. I'm concerned about performance. I don't know how much memory and runtime is wasted on huge kernels with almost everything possible. I'm a java developer and I don't know what most of the modules and drivers are for. So there is not much I can disable and be sure that I don't screw it up. Thanks in advance

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• Supervisor VS cronjob

  - by Guandalino

  Actually I'm using supervisor to monitor a process and restart it when it stops for some reason. The problem is that in case of a supervisor crash the process stops get monitored. So I thought to schedule a cronjob to check supervisor is running, and eventually restart it. The next thing I'm considering is to get rid of supervisor and check my process directly from the cronjob. I read that sometimes supervisor uses too much memory (to be verified, though). What are the pros in having supervisor VS cronjob monitoring the process?

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