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• Speed of TrueCrypt whole disk encryption

  - by Gareth

  I'm getting a new development laptop soon, and I'm thinking of using TrueCrypt to encrypt the whole disk. What kind of performance drop can I expect? 10%? 30%? more? Also, assuming the workload has an effect, would compiling/using Visual Studio be affected much? I cannot seem to find anything like this on the web.

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• Visio 2013 - how to rotate the entire page?

  - by loneboat

  I would like to rotate an entire page, including all of the shapes and text on it. I see here that you can supposedly hold down Control and click-drag the corner of the page to do it: http://office.microsoft.com/en-us/visio-help/rotate-a-page-HP085050946.aspx ... however I can't get this to work. Hovering over the corner does nothing initially, and when I hold Control the cursor becomes a scale/resize icon, rather than a rotate icon (per the MS article I linked to above). I have tried other modifier key combinations while hovering, but nothing seems to produce the rotate icon mentioned.

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• Any reason not to disable Windows kernel paging?

  - by Nathaniel

  So I'm planning on eventually going to 2 GB (mobo max) RAM from 1 GB, and I want to disable kernel paging once I do, because I've heard it can give a performance boost (and that I believe). Any reason not to do it or any general thoughts about it? Edit: for clarification, this is not disabling general RAM paging. This is disabling having kernel memory paged (or at least parts of it, as Charlls noted).

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• System halts for a fraction of second after every 2-3 seconds

  - by iSam

  I'm using Windows 7 on my HP ProBook 4250s. The problem I face is that my system halts for a fraction of second after every 2-3 seconds. These jerks are not letting me concentrate or work properly. This happens even when I'm just typing in notepad while no other application is running. I tried to install every driver from HP's website and there's no item in device manager marked with yellow icon. Following are my system specs: Machine: HP ProBook 4250s OS: Windows 7 professional RAM: 2GB Processor: Intel Core i3 2.27GHz Following is my HijackThis Log: **Logfile of HijackThis v1.99.1** Scan saved at 9:34:03 PM, on 11/13/2012 Platform: Unknown Windows (WinNT 6.01.3504) MSIE: Internet Explorer v9.00 (9.00.8112.16450) **Running processes:** C:\Windows\system32\taskhost.exe C:\Windows\System32\rundll32.exe C:\Windows\system32\Dwm.exe C:\Windows\Explorer.EXE C:\Windows\System32\igfxtray.exe C:\Windows\System32\hkcmd.exe C:\Windows\System32\igfxpers.exe C:\Program Files\Synaptics\SynTP\SynTPEnh.exe C:\Program Files\PowerISO\PWRISOVM.EXE C:\Program Files\AVAST Software\Avast\AvastUI.exe C:\Program Files\Free Download Manager\fdm.exe C:\Windows\system32\wuauclt.exe C:\Program Files\Windows Media Player\wmplayer.exe C:\Program Files\Microsoft Office\Office12\WINWORD.EXE C:\HijackThis\HijackThis.exe R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = http://go.microsoft.com/fwlink/?LinkId=54896 R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://bing.com/ R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://go.microsoft.com/fwlink/?LinkId=69157 R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Search_URL = http://go.microsoft.com/fwlink/?LinkId=54896 R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = http://go.microsoft.com/fwlink/?LinkId=54896 R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = http://go.microsoft.com/fwlink/?LinkId=69157 R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant = R0 - HKLM\Software\Microsoft\Internet Explorer\Search,CustomizeSearch = R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = R3 - URLSearchHook: (no name) - {7473b6bd-4691-4744-a82b-7854eb3d70b6} - (no file) O2 - BHO: Adobe PDF Reader Link Helper - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Common Files\Adobe\Acrobat\ActiveX\AcroIEHelper.dll O2 - BHO: Babylon toolbar helper - {2EECD738-5844-4a99-B4B6-146BF802613B} - (no file) O2 - BHO: MrFroggy - {856E12B5-22D7-4E22-9ACA-EA9A008DD65B} - C:\Program Files\Minibar\Froggy.dll O2 - BHO: avast! WebRep - {8E5E2654-AD2D-48bf-AC2D-D17F00898D06} - C:\Program Files\AVAST Software\Avast\aswWebRepIE.dll O2 - BHO: Windows Live ID Sign-in Helper - {9030D464-4C02-4ABF-8ECC-5164760863C6} - C:\Program Files\Common Files\Microsoft Shared\Windows Live\WindowsLiveLogin.dll O2 - BHO: Minibar BHO - {AA74D58F-ACD0-450D-A85E-6C04B171C044} - C:\Program Files\Minibar\Kango.dll O2 - BHO: Free Download Manager - {CC59E0F9-7E43-44FA-9FAA-8377850BF205} - C:\Program Files\Free Download Manager\iefdm2.dll O2 - BHO: HP Network Check Helper - {E76FD755-C1BA-4DCB-9F13-99BD91223ADE} - C:\Program Files\Hewlett-Packard\HP Support Framework\Resources\HPNetworkCheck\HPNetworkCheckPlugin.dll O3 - Toolbar: (no name) - {98889811-442D-49dd-99D7-DC866BE87DBC} - (no file) O3 - Toolbar: avast! WebRep - {8E5E2654-AD2D-48bf-AC2D-D17F00898D06} - C:\Program Files\AVAST Software\Avast\aswWebRepIE.dll O4 - HKLM\..\Run: [IgfxTray] C:\Windows\system32\igfxtray.exe O4 - HKLM\..\Run: [HotKeysCmds] C:\Windows\system32\hkcmd.exe O4 - HKLM\..\Run: [Persistence] C:\Windows\system32\igfxpers.exe O4 - HKLM\..\Run: [SynTPEnh] %ProgramFiles%\Synaptics\SynTP\SynTPEnh.exe O4 - HKLM\..\Run: [PWRISOVM.EXE] C:\Program Files\PowerISO\PWRISOVM.EXE -startup O4 - HKLM\..\Run: [AdobeAAMUpdater-1.0] "C:\Program Files\Common Files\Adobe\OOBE\PDApp\UWA\UpdaterStartupUtility.exe" O4 - HKLM\..\Run: [AdobeCS6ServiceManager] "C:\Program Files\Common Files\Adobe\CS6ServiceManager\CS6ServiceManager.exe" -launchedbylogin O4 - HKLM\..\Run: [SwitchBoard] C:\Program Files\Common Files\Adobe\SwitchBoard\SwitchBoard.exe O4 - HKLM\..\Run: [ROC_roc_ssl_v12] "C:\Program Files\AVG Secure Search\ROC_roc_ssl_v12.exe" / /PROMPT /CMPID=roc_ssl_v12 O4 - HKLM\..\Run: [avast] "C:\Program Files\AVAST Software\Avast\avastUI.exe" /nogui O4 - HKLM\..\Run: [Wordinn English to Urdu Dictionary] "C:\Program Files\Wordinn\Urdu Dictionary\bin\Lugat.exe" -h O4 - HKLM\..\Run: [Adobe Reader Speed Launcher] "C:\Program Files\Adobe\Reader 8.0\Reader\Reader_sl.exe" O4 - HKCU\..\Run: [Comparator Fast] "C:\Program Files\Interdesigner Software\Comparator Fast\ComparatorFast.exe" /STARTUP O4 - HKCU\..\Run: [Free Download Manager] "C:\Program Files\Free Download Manager\fdm.exe" -autorun O8 - Extra context menu item: Download all with Free Download Manager - file://C:\Program Files\Free Download Manager\dlall.htm O8 - Extra context menu item: Download selected with Free Download Manager - file://C:\Program Files\Free Download Manager\dlselected.htm O8 - Extra context menu item: Download video with Free Download Manager - file://C:\Program Files\Free Download Manager\dlfvideo.htm O8 - Extra context menu item: Download with Free Download Manager - file://C:\Program Files\Free Download Manager\dllink.htm O8 - Extra context menu item: E&xport to Microsoft Excel - res://C:\PROGRA~1\MICROS~2\Office12\EXCEL.EXE/3000 O9 - Extra button: @C:\Program Files\Hewlett-Packard\HP Support Framework\Resources\HPNetworkCheck\HPNetworkCheckPlugin.dll,-103 - {25510184-5A38-4A99-B273-DCA8EEF6CD08} - C:\Program Files\Hewlett-Packard\HP Support Framework\Resources\HPNetworkCheck\NCLauncherFromIE.exe O9 - Extra 'Tools' menuitem: @C:\Program Files\Hewlett-Packard\HP Support Framework\Resources\HPNetworkCheck\HPNetworkCheckPlugin.dll,-102 - {25510184-5A38-4A99-B273-DCA8EEF6CD08} - C:\Program Files\Hewlett-Packard\HP Support Framework\Resources\HPNetworkCheck\NCLauncherFromIE.exe O9 - Extra button: Research - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~2\Office12\REFIEBAR.DLL O9 - Extra button: Change your facebook look - {AAA38851-3CFF-475F-B5E0-720D3645E4A5} - C:\Program Files\Minibar\MinibarButton.dll O10 - Unknown file in Winsock LSP: c:\windows\system32\nlaapi.dll O10 - Unknown file in Winsock LSP: c:\windows\system32\napinsp.dll O10 - Unknown file in Winsock LSP: c:\program files\common files\microsoft shared\windows live\wlidnsp.dll O10 - Unknown file in Winsock LSP: c:\program files\common files\microsoft shared\windows live\wlidnsp.dll O11 - Options group: [ACCELERATED_GRAPHICS] Accelerated graphics O11 - Options group: [INTERNATIONAL] International O13 - Gopher Prefix: O17 - HKLM\System\CCS\Services\Tcpip\..\{920289D7-5F75-4181-9A37-5627EAA163E3}: NameServer = 8.8.8.8,8.8.4.4 O17 - HKLM\System\CCS\Services\Tcpip\..\{AE83ED2F-EF14-4066-ACE2-C4ED07A68EAA}: NameServer = 9.9.9.9,8.8.8.8 O18 - Protocol: ms-help - {314111C7-A502-11D2-BBCA-00C04F8EC294} - C:\Program Files\Common Files\Microsoft Shared\Help\hxds.dll O18 - Protocol: skype4com - {FFC8B962-9B40-4DFF-9458-1830C7DD7F5D} - C:\PROGRA~1\COMMON~1\Skype\SKYPE4~1.DLL O18 - Protocol: wlpg - {E43EF6CD-A37A-4A9B-9E6F-83F89B8E6324} - C:\Program Files\Windows Live\Photo Gallery\AlbumDownloadProtocolHandler.dll O18 - Filter hijack: text/xml - {807563E5-5146-11D5-A672-00B0D022E945} - C:\PROGRA~1\COMMON~1\MICROS~1\OFFICE12\MSOXMLMF.DLL O20 - AppInit_DLLs: c:\progra~2\browse~1\23787~1.43\{16cdf~1\browse~1.dll c:\progra~2\browse~1\22630~1.40\{16cdf~1\browse~1.dll O20 - Winlogon Notify: igfxcui - C:\Windows\SYSTEM32\igfxdev.dll O23 - Service: avast! Antivirus - AVAST Software - C:\Program Files\AVAST Software\Avast\AvastSvc.exe O23 - Service: Google Software Updater (gusvc) - Google - C:\Program Files\Google\Common\Google Updater\GoogleUpdaterService.exe O23 - Service: HP Support Assistant Service - Hewlett-Packard Company - C:\Program Files\Hewlett-Packard\HP Support Framework\hpsa_service.exe O23 - Service: HP Quick Synchronization Service (HPDrvMntSvc.exe) - Hewlett-Packard Company - C:\Program Files\Hewlett-Packard\Shared\HPDrvMntSvc.exe O23 - Service: HP Software Framework Service (hpqwmiex) - Hewlett-Packard Company - C:\Program Files\Hewlett-Packard\Shared\hpqWmiEx.exe O23 - Service: HP Service (hpsrv) - Hewlett-Packard Company - C:\Windows\system32\Hpservice.exe O23 - Service: Intel(R) Management and Security Application Local Management Service (LMS) - Intel Corporation - C:\Program Files\Intel\Intel(R) Management Engine Components\LMS\LMS.exe O23 - Service: Mozilla Maintenance Service (MozillaMaintenance) - Mozilla Foundation - C:\Program Files\Mozilla Maintenance Service\maintenanceservice.exe O23 - Service: @%SystemRoot%\system32\qwave.dll,-1 (QWAVE) - Unknown owner - %windir%\system32\svchost.exe (file missing) O23 - Service: @%SystemRoot%\system32\seclogon.dll,-7001 (seclogon) - Unknown owner - %windir%\system32\svchost.exe (file missing) O23 - Service: Skype Updater (SkypeUpdate) - Skype Technologies - C:\Program Files\Skype\Updater\Updater.exe O23 - Service: Adobe SwitchBoard (SwitchBoard) - Adobe Systems Incorporated - C:\Program Files\Common Files\Adobe\SwitchBoard\SwitchBoard.exe O23 - Service: Intel(R) Management & Security Application User Notification Service (UNS) - Intel Corporation - C:\Program Files\Intel\Intel(R) Management Engine Components\UNS\UNS.exe O23 - Service: @%PROGRAMFILES%\Windows Media Player\wmpnetwk.exe,-101 (WMPNetworkSvc) - Unknown owner - %PROGRAMFILES%\Windows Media Player\wmpnetwk.exe (file missing)

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• Dummy/default page for apache

  - by Ency

  I'm trying to set up default page for my apache2, for following cases: User is accessing http://IP_Address instead of hostname Requested protocol (HTTP/HTTPS) is not available (eg. only http*s*://domain.com exists) Currently I've got something like that <VirtualHost eserver:80> ServerAdmin webmaster@localhost DocumentRoot /var/www/local/ <Directory /> Options FollowSymLinks AllowOverride None </Directory> </VirtualHost> I think, it works well, i'm trying to do similar thing for HTTPS, but it does not work. <VirtualHost eserver:443> SSLCertificateKeyFile /etc/apache2/ssl/dummy.key SSLCertificateFile /etc/apache2/ssl/dummy.crt SSLProtocol all SSLCipherSuite HIGH:MEDIUM ErrorLog /var/log/apache2/error.log # Possible values include: debug, info, notice, warn, error, crit, # alert, emerg. LogLevel warn ServerSignature Off </VirtualHost> My default is places in sites-enabled as a first one 000-default I do not care about not certificate validity during accessing default page, my goal is not show different HTTPS page if user one of points is applied

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• How to monitor the total number of SQL Server logins

  - by Shiraz Bhaiji

  We have an SQL Server 2005 that is the backend of a web application. The application is partly SharePoint and partly web services accessing the database via Entity Framework. In the performance monitor I am seeing average SQL Logins is ca, 60 per second (max 170), but the average logouts is less than 1. Where can I see the total number of SQL Server logins? Anyone have an idea what could be causing this?

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• Looking for CDN Comparison

  - by David Andersson

  I can't seem to find a good performance comparison of different CDN services, like CloudFront, Limelight etc. Anyone's got a good link?

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• Why are there many processes listed under the same title in htop?

  - by javanix

  Can anyone explain to me why there are sometimes 10 or 15 processes with the same title and "stats" listed in htop? I'm guessing there are multiple threads running - but that many of them obviously couldn't be running concurrently. Is there any sort of performance hit taken if a process uses say, 15 non-concurrent threads vs. 10 non-concurrent threads?

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• Why is my new Phenom II 965 BE not significantly faster than my old Athlon 64 X2 4600+?

  - by Software Monkey

  I recently rebuilt my 5 year old computer. I upgraded all core components, in particular from an Athlon 64 X2 4600+ at 2.4 GHz with DDR2 800 to a Phenom II 965 BE (quad core) at 3.6 GHz with DDR3 1333 (actually 1600, but testing consistently detected memory errors at 1600). The motherboard is also much newer and better. The HDD's (x3), DVD writer and card reader are the same. The BIOS memory config is auto-everything except the base timing which I overrode to 1T instead of 2T. The BIOS CPU multiplier is slightly over-clocked to 3.6 GHz from the stock 3.4 GHz. I noticed compiling Java is slower than I expected. As it happens I have some (single-threaded) Java pattern-matching code which is CPU and memory bound and for which I have performance numbers recorded on a number of hardware platforms, including my old system. So I did a test run on the new equipment and was stunned to find that the numbers are only slightly better than my old system, about 25%. The data set it is operating on is a 148,975 character array, which should easily fit in caches, but in any event the new CPU has larger caches all around. The system was, of course, otherwise idle for the test and the test run is a timed 10 seconds to eliminate scheduling anomalies. A long while ago, when I upgraded only memory from DD2 667 to DDR2 800 there was no change in performance of this test, which subjectively supports that the test cycle does not need to (significantly) access main memory, but yes it is creating and garbage collecting a large number of objects in the process of this test (low millions of matches are found for the pattern set). I am about 99.999% certain the code hasn't changed since I last ran it on 2009-03-17 - but I can't easily retest the old hardware, because it is currently in pieces on my work-bench waiting to be built into a new computer for my kids. Note that Windows (XP) reports a CPU speed of 795 MHz unless I have some thing running. With stuff running it seems to jump all over the place each time I use ALT-Pause to display the system properties, everywhere from 795 MHz to 3.4 Ghz. So why might my shiny new hardware under-performing so badly? EDIT: The old memory was Mushkin DDR2 800 with timings set for auto which should have been 5-5-5-12. The new memory is Corsair DDR3 1600, running at 1333 with timings also auto which are 9-9-9-21. In both cases they are a paired set of dual channel DIMMs. I was waiting to ensure my system was stable before tweaking with memory timings.

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• No architecture vs architecture-specific binaries

  - by Aaron

  From what I understand, the noarch suffix means that it's architecture independent and should work universally. If this is the case, why should I install architecture-specific packages at all? Why not just go straight for the noarch? Are there optimizations in the x86 or x64 binaries that aren't found in the noarch binaries? What's best for high performance applications? Folding@Home does this with their controller:

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• What is good usage scenario for Rackspace Cloud Files CDN (powered by AKAMAI) [closed]

  - by Andrew Smith

  I have just setup my website as static page via Rackspace CDN / Akamai. www.example.co.uk is an alias for d9771e6f24423091aebc-345678991111238fabcdef6114258d0e1.r61.cf3.rackcdn.com. d9771e6f24423091aebc-345678991111238fabcdef6114258d0e1.r61.cf3.rackcdn.com is an alias for a61.rackcdn.com. a61.rackcdn.com is an alias for a61.rackcdn.com.mdc.edgesuite.net. a61.rackcdn.com.mdc.edgesuite.net is an alias for a63.dscg10.akamai.net. a63.dscg10.akamai.net has address 63.166.98.41 a63.dscg10.akamai.net has address 63.166.98.40 a63.dscg10.akamai.net has IPv6 address 2001:428:4c02::cda8:ecb9 a63.dscg10.akamai.net has IPv6 address 2001:428:4c02::cda8:ed09 The HTTP header: HTTP/1.0 200 OK Last-Modified: Fri, 19 Oct 2012 23:27:41 GMT ETag: fdf9e14b77def799e09e8ce815a521da X-Timestamp: 1350689261.23382 Content-Type: text/html X-Trans-Id: tx457979be3bd746c2b4e5403a1189cdbc Cache-Control: public, max-age=900 Expires: Sat, 27 Oct 2012 22:18:56 GMT Date: Sat, 27 Oct 2012 22:03:56 GMT Content-Length: 7124 Connection: keep-alive I am wondering, if it's really the fastest solution to power the website? By investigating it thru http://www.just-ping.com/ it seems, that from many places the ping is very high, and during quick investigation I found that they use GeoIP to resolve addresses based on WHOIS, which is not accurate and because of that from many places the ping is above 300ms (for example, if ISP is in balgladore and request is routed to bangladore even if it's 300ms, for period of 1 month), while by just using Amazon Web Services and Route 53 Anycast DNS servers and only 4 EC2 instances it seems that for example India is always below 100ms, while using Akamai it goes above 300ms in some cases, and this is because Route 53 is using BGP. By quickly checking the Akamai, it seems that they are not getting feedback from the traffic - the high ping stays constant even if I keep downloading large files and videos, which is opposite to what they say on their website. They state, that they optimize the performance by taking feedback from the requests, while it seems they just use GeoIP with per City resolution (which are mostly big cities). Because of this, AWS with Route 53 / Anycast DNS seems to be much more reliable, as well EdgeCast which is using BGP, but I dont know how much does it cost to deploy static website. Actually, I dont know if EdgeCast is not a lie, because from isolated places there are many errors - so their performance is at the cost of quality of delivery, because of BGP switching the routes during transfer of large files. So I was wondering, what is really Akamai good for, because they dont seem to pose any strength in any field in what I do understand now, except they offer some software based WAF on their website, but what I really care about is the core distribiution, so the question is? Is really Akamai good for Videos? For static websites? ??? I found so far AWS most usable with most consistent ping and stable transfers.

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• How to clear Windows disk read cache?

  - by Sebastiaan Megens

  For performance testing I need to clear Windows' disk read cache. I tried googling but I couldn't find anything other than rebooting or other manual stuff. Before I give in and do that, I'd like to know if anyone knows of a way to clear Windows disk read cache. I'm testing on Windows 7, but I'm also interested in Windows XP solutions.

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• How do I keep the URL in the address bar when stopping page load in Firefox

  - by Peter Jaric

  Suppose I am visiting a page in Firefox and decide to go somewhere else and type the new URL manually into the address field, but the page fails to load, either because it times out, or because I hit Escape. Then Firefox removes my laboriously entered URL and replaces it with the URL of the current page. This is outrageous! I am pretty sure Firefox has changed this behavior lately, because this was one of the reasons I chose Firefox over IE back in the day. How can I turn off this annoying behavior? OS: Windows 7 Firefox version: 22

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• Can anybody recommend a Windows system monitoring tool similar to iPulse for the Mac?

  - by John MacIntyre

  Occasionally, my PC grinds to a halt, and by the time I get any monitoring tools open (don't forget my PC is slow at this point), performance has picked up a bit. A friend recently told me he uses iPulse, which is awesome since it's always running, and you can just glance at it when there's an issue to see what is happening. Unfortunately it's only for the Mac. Does anybody know of a good Windows system monitoring tool similar to iPulse for the Mac?

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• Can I enable discards on a LUKS-encrypted ssd drive in RHEL6 (and do I need to)?

  - by Dan Nestor

  I have a RHEL 6.4 workstation, running on a LUKS-encrypted LV residing on a SSD. I found RedHat documentation stating that dm_crypt does not currently support TRIM passthrough, however I also found other sources that state the opposite (albeit for other distributions) and even that discards are not needed for recent SSD drives which use some sort of automatic garbage collection. So: 1) Can I enable TRIM/discards with my setup? 2) Do I need to, for optimal disk performance? Thanks for your thoughts.

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• Page File - Why set one for each drive?

  - by Magic

  Hello, I have Windows Vista Business Edition running on my laptop (brand is HCL). I have 4 HDD which are as follows - C - 29.2 GB (of which only 3.68 GB is free) D - 39 GB (of which 37.8 GB is free) E - 39 GB (of which 37.3 GB is free) F - 41.6 (of which 41.4 GB is free) However, my page file settings are as below. Automatically manage paging file for all drives. Question - Why should I set one for each drive? Should I set my page file on the OS Root Drive. I happen to talk to a System Administrator in an IT company and he advised that we should never set the page file on the OS drive but on an alternate drive wherever possible. It would be really helpful, if you can guide me here or at least point me to the right resources so that I can read about paging and best practices of paging. Cheers,

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• Are there any reasons to duplicate table in the same database ?

  - by bob

  Let says we have several MySQL server, one master and some slaves. A member table which contains more than 5.000.000 peoples. Are there any reasons (performance, atomicity, etc..) to use duplicate tables like member_1, member_2, member_3 and then switch randomly when doing operation on it ? (especialy SELECT query) ?

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• How does MySQL 5.5 and InnoDB on Linux use RAM?

  - by Loren

  Does MySQL 5.5 InnoDB keep indexes in memory and tables on disk? Does it ever do it's own in-memory caching of part or whole tables? Or does it completely rely on the OS page cache (I'm guessing that it does since Facebook's SSD cache that was built for MySQL was done at the OS-level: https://github.com/facebook/flashcache/)? Does Linux by default use all of the available RAM for the page cache? So if RAM size exceeds table size + memory used by processes, then when MySQL server starts and reads the whole table for the first time it will be from disk, and from that point on the whole table is in RAM? So using Alchemy Database (SQL on top of Redis, everything always in RAM: http://code.google.com/p/alchemydatabase/) shouldn't be much faster than MySQL, given the same size RAM and database?

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• What changes should I make to an Ubuntu that runs from a USB flash drive?

  - by Georg

  I'm considering running my laptop from a USB flash drive. The system would be one of the Ubuntu family. What should I do to ensure that the USB flash drive lasts as long as possible? What can I do to improve system performance?

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• Save a single web page (with background images) with Wget

  - by mikael

  I want to use Wget to save single web pages (not recursively, not whole sites) for reference. Much like Firefox's "Web Page, complete". My first problem is: I can't get Wget to save background images specified in the CSS. Even if it did save the background image files I don't think --convert-links would convert the background-image URLs in the CSS file to point to the locally saved background images. Firefox has the same problem. My second problem is: If there are images on the page I want to save that are hosted on another server (like ads) these wont be included. --span-hosts doesn't seem to solve that problem with the line below. I'm using: wget --no-parent --timestamping --convert-links --page-requisites --no-directories --no-host-directories -erobots=off http://domain.tld/webpage.html

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• Drupal on an NFS share has terrible performance

  - by Marcus

  We have a setup where a Drupal 7 site with the following setup - a VMware ESXi 4.1 host server running a web vm and an NFS VM. The web VM is using Apache and mod_php. The site is still in development thus we have to turn off all forms of caching due to the frequently-updated files. Each page request takes around 15-20 seconds to complete. Profiling the PHP code shows that the vast majority of time (normally over 90%) is taking by all the is_dir(), is_file() function calls that load up the modules. I've increased PHP's realpath cache size to several megs and an strace shows that the lstat calls then drop from over 200 to around 6 and stat() decreases a bit (around 600 calls). However, while this has shaved off quite a bit of time, I am simply unable to break past the 10 second per request barrier. Is there a way to get better performance out of this setup that doesn't involve caching? Configs and stats: VMs: web - Centos 6 64bt, 2.5GB RAM, normal CPU/HD prioritisation nfs - Centos 6 64bt, 2GB RAM, normal CPU priority, high HD priority PHP: 32M realpath cache size (it's this high for testing purposes) NFS: ~]# egrep -v '#|^$' /etc/nfsmount.conf [ NFSMount_Global_Options ] Defaultvers=4 Ac=False Rsize=32k Wsize=32k Bsize=32k Reading speeds via NFS are not an issue a dd of a 100M test file using 32k blocks returns: 3200+0 records in 3200+0 records out 104857600 bytes (105 MB) copied, 1.84984 s, 56.7 MB/s real 0m1.857s user 0m0.007s sys 0m0.330s Strace on Apache process with empty realpath cache: % time seconds usecs/call calls errors syscall ------ ----------- ----------- --------- --------- ---------------- 50.78 1.157452 337 3434 28 stat 32.58 0.742656 628 1182 425 open 9.29 0.211788 762 278 1 lstat 3.17 0.072322 0 237865 write 2.45 0.055839 490 114 13 access 0.45 0.010262 43 237 brk 0.34 0.007725 10 811 74 read 0.28 0.006340 9 679 fstat 0.22 0.005069 18 281 poll 0.20 0.004533 6 698 getdents 0.09 0.001960 10 190 mmap 0.05 0.001065 14 74 accept4 0.04 0.001000 333 3 chdir 0.03 0.000750 4 190 munmap 0.01 0.000339 0 836 close 0.01 0.000247 3 75 writev 0.00 0.000068 0 611 fcntl 0.00 0.000063 1 77 shutdown 0.00 0.000000 0 1 lseek 0.00 0.000000 0 5 rt_sigaction 0.00 0.000000 0 1 rt_sigprocmask 0.00 0.000000 0 3 setitimer 0.00 0.000000 0 5 socket 0.00 0.000000 0 5 5 connect 0.00 0.000000 0 74 getsockname 0.00 0.000000 0 15 setsockopt 0.00 0.000000 0 5 getcwd 0.00 0.000000 0 1 futex ------ ----------- ----------- --------- --------- ---------------- Strace after realpaths are cached % time seconds usecs/call calls errors syscall ------ ----------- ----------- --------- --------- ---------------- 60.14 1.371006 484 2831 28 stat 31.79 0.724705 627 1155 425 open 3.53 0.080354 0 237865 write 2.65 0.060433 530 114 13 access 0.43 0.009913 99 100 brk 0.38 0.008730 11 804 74 read 0.35 0.007910 12 675 fstat 0.30 0.006775 10 654 getdents 0.13 0.003065 11 281 poll 0.09 0.002000 333 6 1 lstat 0.07 0.001545 2 807 close 0.05 0.001063 14 74 accept4 0.04 0.001000 6 179 mmap 0.02 0.000404 2 179 munmap 0.01 0.000271 4 75 writev 0.01 0.000212 0 611 fcntl 0.01 0.000129 2 77 shutdown 0.00 0.000022 0 74 getsockname 0.00 0.000000 0 1 lseek 0.00 0.000000 0 5 rt_sigaction 0.00 0.000000 0 1 rt_sigprocmask 0.00 0.000000 0 3 setitimer 0.00 0.000000 0 3 socket 0.00 0.000000 0 3 3 connect 0.00 0.000000 0 15 setsockopt 0.00 0.000000 0 5 getcwd 0.00 0.000000 0 3 chdir ------ ----------- ----------- --------- --------- ---------------- Mount: nfs.xxx.xxx.xxx:/path/to/website/files on /path/to/website/files type nfs (rw,hard,intr,noac,vers=4,addr=xx.xx.xx.xx,clientaddr=xx.xx.xx.xx) Any help is, naturally, appreciated.

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• Faster zlib alternatives

  - by BarsMonster

  I wonder, if there are any faster builds of zlib around with more advanced optimizations? If it's possible to optimize it using SSE instructions or Intel C++ compiller, or some trick which were patented earlier (I know patents were a serious limitation during gzip/zlib development), have anyone bothered to implement that? I am especially interested in compression speed, which have a direct impact on high-performance web-services serving static & dynamic content.

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• Is CloudLinux considered to be a stable webserver

  - by Saif Bechan

  I am currently running several websites on a CentOS 5.4 system. I have the choice to switch to Cloudlinux. It is said to be better at handling several websites. Does anyone have any information to share on CloudLinux. This can be on security, stability and just overall performance of the system.

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• ignore or override current document page formatting with predefined settings automatically libreoffice

  - by alex

  When opening a document made by someone else, I would like the margins to automatically be set to 0.4 cm, the page orientation to landscape and page size to A3. My dad gets emailed a spreadsheet weekly and he prints them off. To fit them onto one page he applies these settings, which is quite laborious. I thought that there must be a quicker way of doing this! I tried creating a new default template with these settings but this only works for a new blank document. I tried to create a style to quickly apply these settings but I realised these styles are document / template specific (?) and so don't appear when opening someone else's document. Anyone have any ideas how I can do this? Thanks =]

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• Extract first page from multiple pdfs

  - by Tim Alexander

  Have got about 500 PDFs to go through and extract the first page of. They then need to go through some time consuming conversion process so was hoping to try and save some time by have a batch process to extract just the first page from the 500 pdfs and place it in a new pdf. Have had a poke around Acrobat but can find no real method of doing this for multiple files. Does anyone know any other programs or methods that this could be achieved? Free and open source are obviously more favourable :) EDIT: Have actually had some success using GhostScript to extract just one page. Am now looking at how to batch that and take the list of files and use those.

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