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Articles indexed in January 2011

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• MySQL is killing the server IO.

  - by OneOfOne

  I manage a fairly large/busy vBulletin forums (running on gigenet cloud), the database is ~ 10 GB (~9 milion posts, ~60 queries per second), lately MySQL have been grinding the disk like there's no tomorrow according to iotop and slowing the site. The last idea I can think of is using replication, but I'm not sure how much that would help and worried about database sync. I'm out of ideas, any tips on how to improve the situation would be highly appreciated. Specs : Debian Lenny 64bit ~12Ghz (6x2GHz) CPU, 7520gb RAM, 160gb disk. Kernel : 2.6.32-4-amd64 mysqld Ver 5.1.54-0.dotdeb.0 for debian-linux-gnu on x86_64 ((Debian)) Other software: vBulletin 3.8.4 memcached 1.2.2 PHP 5.3.5-0.dotdeb.0 (fpm-fcgi) (built: Jan 7 2011 00:07:27) lighttpd/1.4.28 (ssl) - a light and fast webserver PHP and vBulletin are configured to use memcached. MySQL Settings : [mysqld] key_buffer = 128M max_allowed_packet = 16M thread_cache_size = 8 myisam-recover = BACKUP max_connections = 1024 query_cache_limit = 2M query_cache_size = 128M expire_logs_days = 10 max_binlog_size = 100M key_buffer_size = 128M join_buffer_size = 8M tmp_table_size = 16M max_heap_table_size = 16M table_cache = 96 Other : From the cloud's IO chart, we're averaging 100mb/s read. > vmstat procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu---- r b swpd free buff cache si so bi bo in cs us sy id wa 9 0 73140 36336 8968 1859160 0 0 42 15 3 2 6 1 89 5 > /etc/init.d/mysql status Threads: 49 Questions: 252139 Slow queries: 164 Opens: 53573 Flush tables: 1 Open tables: 337 Queries per second avg: 61.302. moved from superuser

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• Hyper-V Deployment Options Best Practices

  - by Erv Walter

  In what circumstances would you choose each of the following deployment options: Hyper-V installed as the bare bones Windows Hyper-V Server 2008 R2 Hyper-V role installed on a Windows Server 2008 R2 Server Core installation Hyper-V role installed on a Windows Server 2008 R2 Full Installation For example, I know there are licensing considerations for each option: With Hyper-V on top of a full installation of Enterprise or Data Center edition, you can use Windows Server as a guest OS without needing additional licenses (4 for Enterprise, unlimited for Data Center) With "Windows Hyper-V Server" you have to obtain licenses for each guest OS. But my real question is, are there technical considerations as well? I understand that the Full Installation doesn't perform as well as the other two options, but is there a significant difference between Server Core and "Windows Hyper-V Server"? What are the pros and cons of Hyper-V on Server Core vs "Windows Hyper-V Server" and when would you choose each?

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• Bash Parallelization of CPU-intensive processes

  - by ehsanul

  tee forwards its stdin to every single file specified, while pee does the same, but for pipes. These programs send every single line of their stdin to each and every file/pipe specified. However, I was looking for a way to "load balance" the stdin to different pipes, so one line is sent to the first pipe, another line to the second, etc. It would also be nice if the stdout of the pipes are collected into one stream as well. The use case is simple parallelization of CPU intensive processes that work on a line-by-line basis. I was doing a sed on a 14GB file, and it could have run much faster if I could use multiple sed processes. The command was like this: pv infile | sed 's/something//' > outfile To parallelize, the best would be if GNU parallel would support this functionality like so (made up the --demux-stdin option): pv infile | parallel -u -j4 --demux-stdin "sed 's/something//'" > outfile However, there's no option like this and parallel always uses its stdin as arguments for the command it invokes, like xargs. So I tried this, but it's hopelessly slow, and it's clear why: pv infile | parallel -u -j4 "echo {} | sed 's/something//'" > outfile I just wanted to know if there's any other way to do this (short of coding it up myself). If there was a "load-balancing" tee (let's call it lee), I could do this: pv infile | lee >(sed 's/something//' >> outfile) >(sed 's/something//' >> outfile) >(sed 's/something//' >> outfile) >(sed 's/something//' >> outfile) Not pretty, so I'd definitely prefer something like the made up parallel version, but this would work too.

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• How Do I Enable CUPS Browsing Across A Network?

  - by David Mackintosh

  I have a CUPS server with two print queues defined. Once this was defined, all the CUPS clients on the same subnet could see the two print queues automatically, no problem. Now I have a collection of machines on a separate subnet, reachable from the first subnet by a router. How do I enable CUPS browsing on the second set of machines so that they can see the print queues defined on the first machine? Let's call the server A.B.C.7. The first subnet is A.B.C.0/24. The second subnet is A.B.D.0/24, and there is a router with arms on both networks.

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• Cannot open any applications on windows server 2008 R2 Standard edition

  - by kishore

  I have a server running on Windows server 2008 R2. It is recently added as a member of a domain. I am not able to start any applications in thew server. When I tried to open Event viewer it errored out saying "The page file is to small to complete the action". I am experiencing same problem when I tried to open Sql server Management studio, task scheduler or any other application. The windows server serves as a production database server, but our applications are not experiencing any problems. Can someone please help?

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• How do you expand a raid disk array in a dell 2850?

  - by johnny

  Hi, I have a Dell 2850 and I want to install Windows 2008 Server. Problem is that my C drive only has 16GB of space. The requirements say I need at least 20. I have an open bay for a drive. If I put in another drive, how can I add that to the array and them make it only for the C drive? what do I do? Thank you. edit: I don't want to remove any drives. I just want to add a new one to the existing array. Can I do that and make sure that new drive is for the logical C drive?

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• How to configure permissions for win2008 task running as Network Service to stop/start a service on different system?

  - by weiji

  Well... title says it all, actually. We've got a Scheduled Task set up on a windows server 2003 box running as the Network Service, and the batch file it runs will invoke "sc" to stop and then start a service on another windows box, however sc reports: [SC] OpenService FAILED 5: Access is denied. Running the same batch file via the windows explorer has no issues, and my user account is part of the Administrators group so I believe this is why there are no issues when I try it manually. Is this a permissions thing I enable for Network Service on the first server? Or do I enable permissions for Network Service somehow on the target server? This question (http://serverfault.com/questions/19382/why-sc-query-fails-from-one-machine-but-works-from-another) touches on something similar, but I'm looking for enabling the Network Service to access the service via the scheduled task.

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• How can I get Solr listening on 0.0.0.0 instead of just localhost?

  - by Neil

  I'm trying to get Solr to listen on 0.0.0.0 instead of just localhost, and it doesn't seem to be picking up the configuration options. I downloaded apache-solr-1.4.1 from the Solr website, and I'm running: user@:apache-solr-1.4.1/example $ java -jar start.jar With these configuration options: <Call name="addConnector"> <Arg> <New class="org.mortbay.jetty.bio.SocketConnector"> <Set name="host"><SystemProperty name="jetty.host" default="0.0.0.0" /></Set> <Set name="port"><SystemProperty name="jetty.port" default="8983" /></Set> <Set name="maxIdleTime">50000</Set> <Set name="lowResourceMaxIdleTime">1500</Set> </New> </Arg> </Call> Where the only line changed from the default is this one: <Set name="host"><SystemProperty name="jetty.host" default="0.0.0.0" /></Set> And when I check netstat, I see this: $ netstat -an | egrep 'Proto|\b8983\b' Proto Recv-Q Send-Q Local Address Foreign Address State tcp 0 0 127.0.0.1:8983 0.0.0.0:* LISTEN tcp6 0 0 ::1:8983 :::* LISTEN Where Local Address should be 0.0.0.0:8983 instead of 127.0.0.1:8983. Does anyone know why this might not be working?

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• Setting Environment Variable for Tomcat 6 Servlet

  - by amaevis

  I'm using Ubuntu's default installation of Tomcat 6. I'm deploying a ROOT.war, and trying to set an environment variable specific to it, i.e. accessible from System.getenv() in the Servlet.init(config). According to the docs (http://tomcat.apache.org/tomcat-6.0-doc/config/context.html), I can specify this in a Context element in conf/Catalina/localhost/ROOT.xml. I've created that with these contents: <Context> <Environment name="FOO" value="bar" type="java.lang.String" override="false"/> </Context> And I've deployed the webapp as usual, i.e. to webapps/ROOT.war. Server.getenv("FOO") in the Servlet.init(config) still returns null. What am I missing?

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• Motherboard running rather hot while gaming

  - by I take Drukqs

  Case: Antec 1200 Mobo: Gigabyte GA-X58A-UD3R CPU: Intel i7 950 (stock cooler) GPU: EVGA GeForce 570 GTX RAM: 2x 2 GB (4 GB total) DDR3 dual-channel Corsair OS: Windows 7 Home Premium 64-bit This is my first build and it's brand new. I had no problems putting it all together in a few hours one evening and I consider myself to be pretty good with computers. Not to brag or anything like that! Just saying I've been fiddling with them since I was in diapers and I have a good amount of experience under my belt, just not with certain things yet. Recently while playing many of the latest games maxed out without a hitch my motherboard has been running hot and like anyone who's ever built a computer it scares the life out of me. I checked HWMonitor and saw that my motherboard sometimes reached temperatures of around 52 - 78c (the number 78 obviously being what's scaring me). I was wondering if such a temperature is normal and if not what the problem could be. Air flow in my case is phenomenal and besides having to ship back a faulty GPU and reseat my CPU my first build has been a very large success which I am enjoying tremendously. There is literally almost no dust in my case due to it being very new as previously mentioned and my RAM sticks are in the correct slots for dual-channel mode. My cable management is pretty great in my opinion with only cables from my PSU lingering in the bottom of the case. At any given opportunity I ran my cables behind my mobo. Air flow should definitely not be a problem because my CPU only goes up to about 60c and my GPU only goes up to about 80c. Thank you very much in advance.

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• How can I determine what codec is being used?

  - by jldugger

  This forum comment and this superuser answer suggest that the audio compression contributes to loss of quality. I've noticed that music played over my BT setup sometimes pitch bends in ways I don't remember the original doing, and I'm wondering if SBC has something to do with it. I'm using Ubuntu 10.10 on a Mac Pro, connecting to a pair of Sony DR-BT50's. Is there a way to inspect which Bluetooth codec pulseaudio is using, what codecs both ends of the bluetooth link support?

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• In Outlook 2010, can you add "Categories" to the "New Email" Ribbon?

  - by Jeff

  I couldn't figure out how to do this in Outlook 2007, and I was hoping I could do it in Outlook 2010... I want the ability to quickly apply a category when composing a new email (typically a "Waiting For..." category) for things that need a response. It is possible to apply a category by clicking the "Options" ribbon, then the little arrow under the More Options section - but why can't I get the nice big "Categories" drop-down that's available in the "Tags" section of the main Outlook window. There are about a kabillion commands in the "Customize Ribbon" dialog box for the New Mail window, but I couldn't find anything about Categories. Should I just give up?

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• LAME: Switch sample rate of file without reencoding?

  - by TK Kocheran

  Is it possible to resample an MP3 file to a different rate (44.1) without doing a reencode? I have a few MP3 files that are at 48 and I need to switch 'em to 44.1, and I don't want to have to reencode my files to do so, as I'll lose quality. The source files are at CBR 320 and at 48kHz. Can this be done? The current way I'm doing it is using the following command: lame -b 320 -q 0 --resample 44.1 input.mp3 output.mp3 Is there a better way to do this?

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• Disable WLan if Wired/Cable Network is available

  - by ifischer

  The question says it all. All i want is that my W-Lan connection should be disabled whenever a wired connection is available. What would be the easiest way to do that in Ubuntu/Gnome? In all guides (for instance some about guessnet) i found i had to configure my whole network configuration (WPA keys, DHCP, ...), but i find that a bit too complicated for such a simple use case. I just want to disable wlan0 when eth0 is connected.

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• How to open recovered files in word?

  - by GiH

  My computer restarted while I was asleep because of system updates (need to turn that off), and when I opened up Word the first time after it restarted, it gave me a pane on the left hand side that showed me all the documents I had opened. I chose one of the documents but I want to open them all, how can I bring that pane back? Update: I forgot to mention I'm on Word 2007. I've found that if you go to C:\Users*YOURUSER*\AppData\Roaming\Microsoft\Word you can see the autorecovery files. Mine are still in there, but I don't want to touch them, I'd rather bring back that pane and do it right just in case they disappear as soon as I double click haha...

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• Alternative firmware for Belkin N1 vision

  - by ChrisRamakers

  Me and routers ... it's never been a happy marriage and probably never will. I've had 3 routers, a d-link DIR615, Belkin N1 Vision and a linksys WRT54g. I've been most happy with the linksys since that is the only one that works out of the box and doesn't drop connection or has other annoying flaws. Recently i dug op my d-link again only to be confronted with the buggy firmware again so i decided it was time for action and i slammed DDWRT on it. Works flawlessly now. Now i was looking to do the same thing with my Belkin N1 Vision (which has even worse firmware) but it seems DDWRT isn't available for it yet. Now here's my question, does anyone know of other opensource firmware for the N1 Vision? I've checked tomato but it doesn't list among the supported routers.

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• How do you create virtual folders from saved search

  - by Jérôme Radix

  I would like to have on unix-like platforms, the same functionality as to Windows 7 Library folders (aka virtual folders) you see in Windows Explorer. Gnome Nautilus do that kind of virtual folders through saved search. But I want a system-wide solution, not a gnome-wide solution. Is there a tool that creates virtual folders from the concatenation of multiple search queries (the result of multiple find commands ?). The solution should index files for better performances and you should be able to define the default folder for copy operations. I assume the solution of this kind of problem certainly use FUSE, but I can't see a complete solution to this kind of task in FUSE applications.

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• Use ImageMagick to convert TIFF to PNGs, how to improve the speed?

  - by Woo

  I am using "convert" from IM to get PNGs from multi-page TIFF files, everything is good except the speed. From "convert" documentation, I found: For the MNG and PNG image formats, the quality value sets the zlib compression level (quality / 10) and filter-type (quality % 10). For compression level 0, the Huffman-only strategy is used, which is fastest but not necessarily the worst compression. The default PNG compression is 75. So I tried "-quality 0", but almost no changes with the spreed. Anyone can share the ideas of how to improve the spreed? Here are my command: convert 100Pages.tif[0,1,2,3,4,5] -quality 0 100Pages.png Thanks!

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• Practical Approaches to increasing Virtualization Density-Part 1

  - by Girish Venkat

  Happy New year everyone!. Let me kick start the year off by talking about Virtualization density.  What is it?The number of virtual servers that a physical server can support and it's increase from the prior physical infrastructure as a percentage. Why is it important?This is important because the density should be indicative of how well the server is getting consumed?So what is wrong ?Virtualization density fails to convey the "Real usage" of a server.  Most of the hypervisor based O/S Virtualization  evangelists take pride in the fact that they are now running a Virtual Server farm of X machines compared to a Physical server farm of Y (with Y less than X obviously). The real question is - has your utilization of the server really increased or not.  In an internal study that was conducted by one of the top financial institution - the utilization of servers only went up by 15% from 30 to 45. So, this really means that just by increasing virtualization density one will not be achieving the goal of using up the servers in their server farm better.  I will write about what the possible approaches are to increase virtualization density in the next entry. 

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• Where can I find statistics / figures on how long testing should / could take?

  - by NoCarrier

  I'm trying to convince management that testing/QA takes considerably longer than non-developers think. Some smaller shops don't have budgets for testers and phbs automatically assume the developer will spend a few minutes after every build "testing" and deliver a perfectly functional system. Can someone point me to some numbers? e.g. Testing should be XX% of your total man hour count , etc etc? Or perhaps some real world experience? My goal is to have some numbers that are grounded in real life so I can make time/effort allocation justifications for "proper" testing when preparing estimates and timelines for applications. Maybe not full blown 100% TDD, but pragmatically close to it. I apologize if I seem vague.

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• How can I determine what codec is being used?

  - by pwnguin

  This forum comment and this superuser answer suggest that the audio compression contributes to loss of quality. I've noticed that music played over my BT setup sometimes pitch bends in ways I don't remember the original doing, and I'm wondering if SBC has something to do with it. I'm using Ubuntu 10.10 on a Mac Pro, connecting to a pair of Sony DR-BT50's. Is there a way to inspect which Bluetooth codec pulseaudio is using, what codecs both ends of the bluetooth link support?

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• Screen magnifier wrecks login screen — how to get rid of it?

  - by Jonik

  In the Ubuntu / GNOME login screen, I tried some of the different accessibility settings out of curiosity. Big mistake! Enabling the "use screen magnifier" (or whatever) option breaks down the view horribly, and makes it impossible to even access the settings again: (Right click & View Image for full size) Yes, I tried to access every corner of the screen using the mouse, but there's just chaos everywhere. Fortunately, I can still log in (pressing "Esc" makes the normal login dialog appear on the left-hand monitor). My question is, how to disable the "magnifier" option outside of the login screen itself? (By editing some config file perhaps?) I don't care about getting the magnifier mode to work properly - just make it go away altogether, please.

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• How can I set up private, per-user sections on Joomla?

  - by Michael Paulukonis

  For this weekend's GiveCamp project, my team has been tasked with adding some functionality to an existing Joomla-powered website for a non-profit. A certain type of user will login, and have access to a personal area where they can upload files, check for messages, see tasks that have been assigned, etc. Each user would have their own area. They would not be creating pages, and their information would only be visible to themselves (or a site-administrator, of course. No sort of weird HIPAA privacy involved). None of us have worked with Joomla before, but we'd like to help this non-profit. We're not sure if we're searching using the wrong terms, or if we're just not finding it. Is such a solution possible in Joomla? And/or are we better off building some standalone solution that interfaces with the same mySQL database as Joomla?

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• GL_INVALID_OPERATION in glEnd

  - by Killrazor

  Hello, I'm having problems drawing a simple sprite. When I draw: void CSprite2D::render() { CHECKGL(glLoadIdentity()); CHECKGL(glEnable(GL_TEXTURE_2D)); CHECKGL(glEnable(GL_BLEND)); CHECKGL(glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA)); m_texture->bind(); //CHECKGL(glPushMatrix()); CHECKGL(glBegin(GL_TRIANGLE_STRIP)); CHECKGL(glNormal3i(0,0,1)); CHECKGL(glTexCoord2f(m_textureAreaStart.s,m_textureAreaStart.t)); // 0,0 by default CHECKGL(glVertex3i(m_position.x,m_position.y,0)); CHECKGL(glNormal3i(0,0,1)); CHECKGL(glTexCoord2f(m_textureAreaEnd.s,m_textureAreaStart.t)); // 1,0 by default CHECKGL(glVertex3i( m_position.x + m_dimensions.x, m_position.y, 0)); CHECKGL(glNormal3i(0,0,1)); CHECKGL(glTexCoord2f(m_textureAreaEnd.s, m_textureAreaEnd.t)); // 1,1 by default CHECKGL(glVertex3i( m_position.x + m_dimensions.x, m_position.y + m_dimensions.y, 0)); CHECKGL(glNormal3i(0,0,1)); CHECKGL(glTexCoord2f(m_textureAreaStart.s, m_textureAreaEnd.t)); // 0,1 by default CHECKGL(glVertex3i( m_position.x, m_position.y + m_dimensions.y,0)); CHECKGL(glEnd()); //CHECKGL(glPopMatrix()); CHECKGL(glDisable(GL_BLEND)); } I'm always get an GL_INVALID_OPERATION in glEnd(). I suspect that error is not here, but I can't detect where may be. Actually, the output render seems ok. But I want to solve this situation before to catch a subtle bug tomorrow. Any idea of what could be

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• Why does OpenGL seem to ignore my glBindTexture call?

  - by Killrazor

  I'm having problems making a simple sprite rendering. I load 2 different textures. Then, I bind these textures and draw 2 squares, one with each texture. But only the texture of the first rendered object is drawn in both squares. Its like if I'd only use a texture or as if glBindTexture don't work properly. I know that GL is a state machine, but I think that you only need to change active texture with glBindTexture. I load texture with this method: bool CTexture::generate( utils::CImageBuff* img ) { assert(img); m_image = img; CHECKGL(glGenTextures(1,&m_textureID)); CHECKGL(glBindTexture(GL_TEXTURE_2D,m_textureID)); CHECKGL(glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR)); CHECKGL(glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR)); //CHECKGL(glTexImage2D(GL_TEXTURE_2D,0,img->getBpp(),img->getWitdh(),img->getHeight(),0,img->getFormat(),GL_UNSIGNED_BYTE,img->getImgData())); CHECKGL(glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, img->getWitdh(), img->getHeight(), 0, GL_RGBA, GL_UNSIGNED_BYTE, img->getImgData())); return true; } And I bind textures with this function: void CTexture::bind() { CHECKGL(glBindTexture(GL_TEXTURE_2D,m_textureID)); } Also, I draw sprites with this method void CSprite2D::render() { CHECKGL(glLoadIdentity()); CHECKGL(glEnable(GL_TEXTURE_2D)); CHECKGL(glEnable(GL_BLEND)); CHECKGL(glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA)); m_texture->bind(); CHECKGL(glPushMatrix()); CHECKGL(glBegin(GL_QUADS)); CHECKGL(glTexCoord2f(m_textureAreaStart.s,m_textureAreaStart.t)); // 0,0 by default CHECKGL(glVertex3i(m_position.x,m_position.y,0)); CHECKGL(glTexCoord2f(m_textureAreaEnd.s,m_textureAreaStart.t)); // 1,0 by default CHECKGL(glVertex3i( m_position.x + m_dimensions.x, m_position.y, 0)); CHECKGL(glTexCoord2f(m_textureAreaEnd.s, m_textureAreaEnd.t)); // 1,1 by default CHECKGL(glVertex3i( m_position.x + m_dimensions.x, m_position.y + m_dimensions.y, 0)); CHECKGL(glTexCoord2f(m_textureAreaStart.s, m_textureAreaEnd.t)); // 0,1 by default CHECKGL(glVertex3i( m_position.x, m_position.y + m_dimensions.y,0)); CHECKGL(glPopMatrix()); CHECKGL(glDisable(GL_BLEND)); } Edit: I bring also the check error code: int CheckGLError(const char *GLcall, const char *file, int line) { GLenum errCode; //avoids infinite loop int errorCount = 0; while ( (errCode=glGetError()) != GL_NO_ERROR && ++errorCount < 3000) { utils::globalLogPtr log = utils::CGLogFactory::getLogInstance(); const GLubyte *errString; errString = gluErrorString(errCode); std::stringstream ss; ss << "In "<< __FILE__<<"("<< __LINE__<<") "<<"GL error with code: " << errCode<<" at file " << file << ", line " << line << " with message: " << errString << "\n"; log->addMessage(ss.str(),ZEL_APPENDER_GL,utils::LOGLEVEL_ERROR); } return 0; }

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