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• Optimizing PHP<>MySQL performance

  - by BarsMonster

  I am trying to optimize my PHP<MySQL on this test script: <? for($i=0;$i<100;$i++)//Itterations count $res.= var_dump(loadRow("select body_ru from articles where id>$i*50 limit 100")); print_r($res); ?> I have APC, and article table have an index on id. Also, all these queries are hitting query cache, so sole MySQL performance if great. But when I am using ab -c 10 -t 10 to bench this scipt, I am getting: 100 itterations: ~100req/sec (~10'000 MySQL queries per second) 5 itteration: ~200req/sec 1 itteration: ~380req/sec 0 itteration: ~580req/sec I've tried to disable persistent connections in PHP - it made it slower a bit. So, how can I make it work faster, provided that MySQL is not limiting performance here?

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• How to Modify a Cronjob Email Subject

  - by justinl

  I am running a half dozen different cron jobs from my hosting at Hostmonster.com. When a cronjob has been executed I receive an email with the output of the script. The email comes in the format of: From: Cron Daemon Subject: Cron /ramdisk/bin/php5 -c /home5/username/scheduled/optimize_mysql.bash The problem with this is that the subject of the email makes it very hard to read which cronjob the email is pertaining to. Is there a way to modify the subject of a cronjob email so that it's easier to read? For example: From: Cron Daemon Subject: Optimize MySQL Database

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• Processor speeds on my machine don't live up to manufacturer hype

  - by atch

  Why am I not seeing the promised speed claims of processor manufacturers on my computer? Producers of processors claim that their product can perform so many thousands (or millions) of operations per second. And yet on my machine (4GB, 3500hz), the typical program (Word, Visual Studio etc.) takes at least 10 seconds to start. I've formatted my hard drive and ticked all the necessary boxes to optimize my machine and yet I'm not seeing the promised speeds. Say it takes Outlook ten seconds to load. How many millions of operations does it really go through in order to start up?

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• Powershell overruling Perl binmode?

  - by hippietrail

  I have a Perl script which creates a binary file while scanning a very large text file. It outputs to STDOUT which I redirect in the commandline to a file. To optimize it I'm making changes then seeing how low it takes to run. On Linux for this I use the "time" command. On Windows the best way to time a program seemed to be to PowerShell's "measure-command". This seemed to work fine but I noticed the generated files were larger. On examination I found that the files generated from within PowerShell begin with a BOM and contain CRLF pairs! My Perl script has a "binmode STDOUT" directive and does work correctly in a normal dosbox. Is this a bug or misfeature in PowerShell or measure-command? Has it affected others creating binary files by means other than Perl? Googling hasn't turned anything up so far. I'm using Perl 5.12, PowerShell v1.0 and Windows XP.

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• How do I make vim's autoindent not drop trailing spaces?

  - by Joey Adams

  In some text editors (e.g. Kate, gedit), when auto indent is enabled, pressing return twice will leave a trailing whitespace (which I want): if (code) { .... ....| } While others cater to the coding standard where trailing spaces (even in blank lines) aren't allowed: if (code) { ....| } What annoys me about this is that if I arrow up after auto-indenting, the auto-indent is lost: if (code) { | .... } If I run vim and :set autoindent , I get the latter behavior. My question is, how do I set vim to keep the trailing spaces rather than automatically removing them if they go unused?

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• Can i enlarge os c drive of my windows 8? [migrated]

  - by Sorgatz

  Last year I got a new Western Digital WD Blue 500GB HDD to replace my old drive. The first thing I did was to install latest Windows 8. While installing Windows 8 I created 3 partitions, C drive for the OS and others for storage. The OS partition is 120GB (which at the time I thought would be plenty big) but I'm now realizing its too small! I wonder if it's possible to re-size HDD partition without reformatting and re-install my Windows 8. So that is my question, Can i enlarge os c drive of my windows 8 without having to re-format? I've used the Norton Partition Magic and Disk Management to make this happen but there doesn't seem to be any options to make it happen. Thanks for any help you guys can give regarding my question. I've worked hard to optimize my current install of Windows 8 and would hate to start all over again.

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• How to install ac-R mode in emacs?

  - by David

  I have recently added the file ac-R.el to /usr/local/share/emacs/site-lisp, along with (require 'ac-R) to ~/.emacs Now, when I open emacs with --debug-init, I get the error Debugger entered--Lisp error: (void-variable ac-modes) add-to-list(ac-modes ess-mode) eval-buffer(#<buffer *load*<2>> nil "/usr/local/share/emacs/site-lisp/ac-R.el" nil t) ; Reading at buffer position 7191 load-with-code-conversion("/usr/local/share/emacs/site-lisp/ac-R.el" "/usr/local/share/emacs/site-lisp/ac-R.el" nil t) require(ac-R) eval-buffer(#<buffer *load*> nil "/home/dlebauer/.emacs" nil t) ; Reading at buffer position 3548 load-with-code-conversion("/home/dlebauer/.emacs" "/home/dlebauer/.emacs" t t) load("~/.emacs" t t) #[nil "\205\264 and when clicking on load-with-code-conversion, it says Can't find library /usr/share/emacs/23.1.50/lisp/international/mule.el even though I have installed mule via synaptic (I am using Ubuntu 10.04) How can I get the mule library in the right place?

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• Slight network lag on Small Business Server 2008 R2

  - by Sir.Nathan Stassen

  I recently upgraded a network from a SBS 2003 server to a SBS 2008 R2 Server. Both I and users have noticed a slight delay in network applications and browsing network drives on the new server. It is minor, maybe a second or two at most. However I am wondering if anyone knows of anyway to optimize the networking to service requests sooner to the workstations. The network is running a 1 gig network with some 100 meg devices (mainly network printers). All workstations are XP SP3 Network software runs out of a shared folder mapped as a network drive, no sql databases. Server is a Dell Poweredge T610 with plenty of ram, cpu power, and storage.

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• Analyzing Linux NFS server performance

  - by Kamil Kisiel

  I'd like to do some analysis of our NFS server to help track down potential bottlenecks in our applications. The server is running SUSE Enterprise Linux 10. The kind of things I'm looking to know are: Which files are being accessed by which clients Read/write throughput on a per-client basis Overhead imposed by other RPC calls Time spent waiting on other NFS requests, or disk I/O, to service a client I already know about the statistics available in /proc/net/rpc/nfsd and in fact I wrote a blog post describing them in depth. What I'm looking for is a way to dig deeper and help understand what factors are contributing to the performance seen by a particular client. I want to analyze the role the NFS server plays in the performance of an application on our cluster so that I can think of ways to best optimize it.

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• Best SQL Server Configuration with this hardware.

  - by DavidStein

  I just received my new SQL Server from Dell. The server will be serve approximately 15 OLTP databases which average 10GB in size. Here are the basic specs: Dell PowerEdge R510 with up to 12 Hot Swap HDDs,LED Intel Xeon E5649 2.53GHz, 12M Cache, 5.86 GT/s QPI, 6 core (Quantity of 2) 48GB Memory (6x8GB), 1333MHz Dual Ranked RDIMMs for 2 Processors, Optimized PERC H700 Integrated RAID Controller, 1GB NV Cache 300GB 15K RPM SA SCSI 6Gbps 3.5in Hotplug Hard Drive (Quantity of 4) 600GB 15K RPM SA SCSI 6Gbps 3.5in Hotplug Hard Drive (Quantity of 6) My first thought was to use 3 arrays. OS - Raid 1 - (2)300GB T-Log - Raid 1 (2)300GB DB - Raid 5 (5) 600GB Backup - (1) 600GB - non-raided. However, I could also do the following after purchasing one more drive for backup. OS and T-Log - Raid 10 - (4)300GB DB - Raid 10 (6)600GB The hard drive space is not an issue as the databases are not that large. I'm just trying to optimize the speed of the applications using these databases. So, what would you guys recommend?

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• How to determine the used size of device associated's buffer

  - by dubbaluga

  Hi, when mounting a device without the "sync" option, e. g. by invoking the following: mount -o async /dev/sdc1 /mnt a buffer is associated with a device to optimize (speed) read/write operations. Is there a way to determine the size of this buffer? Another question that comes into my mind is, if it's possible to find out how much of it is used currently. This can be interesting to determine the time it would take to "sync" or "umount" slow devices, such as flash-based media. Thanks in advance for your answers, Rainer

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• How to set User Tile image Windows Server 2012?

  - by moontear

  I found this nice article of how to add a user tile image via code: http://joco.name/2010/12/06/i-discovered-the-new-windows-user-tile-api/ This is also explained in depth here: http://msitpros.com/?p=1036 I have problems with doing this in Windows Server 2012. Whenever I run the code: using System; using System.Runtime.InteropServices; namespace FejesJoco { class Program { [DllImport("shell32.dll", EntryPoint = "#262", CharSet = CharSet.Unicode, PreserveSig = false)] public static extern void SetUserTile(string username, int whatever, string picpath); [STAThread] static void Main(string[] args) { SetUserTile(args[0], 0, args[1]); } } } I get an exception: Error HRESULT E_FAIL has been returned from a call to a COM component. Can anyone get this to work and add a user tile image via code?

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• force all urls to www and force domain to non-www

  - by Digital site

  I was trying to force my domain to redirect without www and could success through this code: .htaccess: RewriteCond %{HTTP_HOST} ^www\.domain\.com [NC] RewriteRule ^(.*) http://domain.com/$1 [R=301,L] however, this code is going to redirect all www to non-www, which is not what I want. I just want to make the main domain from www.mydomain.com to mydomain.com and the rest of the urls should be forced to www. any idea how to add or modify the code so I can achieve that through .htaccess ? Update: Thanks to all. I found out that swf file from piecemaker was corrupted and updated it with new one. so now it is all fine and works on both www and non-www. I'm still curious how to solve this issue anyways using .htaccess. Thanks again.

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• I'm receiving an SSL error in various browsers, but I can't find non-SSL content

  - by Scott Vercuski

  I'm receiving an error with my SSL connection. Using google chrome I see the following error: Your connection is encrypted with 128-bit encryption ... however this page includes other resources which are not secure I've scoured the source code, scripts and rendered code in the browser but cannot find where an http:// call is made. I've also used Fiddler2 to examine the traffic and everything is coming across via HTTPS. Has anyone run into this issue before and if so how did you go about finding the culprit. The website is running ASP.NET MVC3 in C#. The page in question is a simple payment page. The only external call is the google analytics tracking code. The page appears to load correctly, all images and scripts are in place.

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• apache and ajp performance

  - by user12145

  I have an apache sitting in front of two tomcat app servers(one on the same physical server, the other on a different one) that does time consuming work(0.5 sec to 10sec per request). The apache http server is getting killed by an average of 1 to 2 concurrent requests per second. both Server spec is about 2GB of RAM. Is there a way to optimize apache to handle the load? any advise is welcome. BalancerMember ajp://localhost:8009/whoisserver BalancerMember ajp://XXX.XX.XXX.XX:8009/whoisserver I keep getting the following in apache2.2 log: [Mon Dec 28 00:31:02 2009] [error] ajp_read_header: ajp_ilink_receive failed [Mon Dec 28 00:31:02 2009] [error] (120006)APR does not understand this error code: proxy: read response failed from 127.0.0.1:8009 (localhost)

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• my webserver with 16GB ram shows all RAM as used, but is it really, see the 'top'

  - by Alex

  I have some questions about my web server. Its a LAMP web server running centos 5.5 and php5, mysql5. The server gets hundreds (maybe thousand) of concurrent users during peak hours. I'm trying to optimize a little and understand "top". From what I can see: all 16GB of my ram have been used up? does that mean that my server needs more memory? My swap is only 2GB, should it be increased? usually during peak hours my server load average first number is about 2.5-3. What could I do to optimize the server so that the load average even during peak doesn't go above 1? In the past I was told a good working server should stay under 1 load, is this still true? Although even during load of 2.5-3, server pages and applications seem to load with pretty good speed. what should the memory size in php.ini be set to? top - 14:30:18 up 2 days, 12:41, 5 users, load average: 1.25, 1.74, 2.92 Tasks: 305 total, 2 running, 302 sleeping, 0 stopped, 1 zombie Cpu(s): 6.3%us, 0.9%sy, 0.0%ni, 92.5%id, 0.2%wa, 0.0%hi, 0.1%si, 0.0%st Mem: 16427200k total, 16111472k used, 315728k free, 3120316k buffers Swap: 2104496k total, 268k used, 2104228k free, 6216756k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 29080 apache 15 0 358m 36m 5192 S 20.2 0.2 2:08.40 httpd 29093 apache 18 0 357m 36m 5192 S 18.2 0.2 2:02.52 httpd 29079 apache 15 0 370m 49m 5832 S 10.0 0.3 2:32.14 httpd 1812 apache 15 0 370m 49m 5196 S 7.3 0.3 2:25.30 httpd 5204 apache 15 0 358m 36m 5168 S 5.3 0.2 0:59.28 httpd 29075 apache 15 0 370m 48m 5184 S 3.3 0.3 2:15.93 httpd 9712 apache 15 0 360m 38m 5180 S 3.0 0.2 0:54.81 httpd 29072 apache 16 0 358m 36m 5192 S 2.7 0.2 2:24.43 httpd 6310 apache 17 0 388m 67m 5180 S 2.3 0.4 0:58.85 httpd 8674 apache 15 0 343m 21m 4980 S 2.0 0.1 0:07.91 httpd 29085 apache 15 0 371m 49m 5224 S 2.0 0.3 2:16.86 httpd 29083 apache 15 0 370m 48m 5196 S 1.7 0.3 2:10.64 httpd 5575 apache 15 0 357m 36m 5228 S 1.3 0.2 0:53.78 httpd 29066 apache 15 0 379m 59m 5860 R 1.3 0.4 2:11.93 httpd 29078 apache 15 0 370m 48m 5188 S 1.3 0.3 2:14.52 httpd 29084 apache 15 0 370m 48m 5208 S 1.0 0.3 2:02.49 httpd 29089 apache 15 0 370m 48m 5188 S 1.0 0.3 2:27.61 httpd 29082 apache 15 0 390m 68m 5188 S 0.7 0.4 2:32.48 httpd 29984 apache 15 0 358m 36m 5228 S 0.7 0.2 2:08.32 httpd 3571 root 16 0 13400 1792 848 S 0.3 0.0 2:37.89 top 4419 mysql 15 0 668m 175m 7204 S 0.3 1.1 3:32.25 mysqld 28181 root 15 0 90460 3624 2680 S 0.3 0.0 0:17.60 sshd 29091 apache 15 0 390m 69m 5196 S 0.3 0.4 2:29.99 httpd 32476 root 15 0 12900 1320 848 R 0.3 0.0 0:06.46 top 1 root 15 0 10372 680 572 S 0.0 0.0 0:02.01 init 2 root RT -5 0 0 0 S 0.0 0.0 0:00.51 migration/0 3 root 34 19 0 0 0 S 0.0 0.0 0:00.07 ksoftirqd/0 4 root RT -5 0 0 0 S 0.0 0.0 0:00.00 watchdog/0 5 root RT -5 0 0 0 S 0.0 0.0 0:00.12 migration/1 6 root 34 19 0 0 0 S 0.0 0.0 0:00.03 ksoftirqd/1 7 root RT -5 0 0 0 S 0.0 0.0 0:00.00 watchdog/1 8 root RT -5 0 0 0 S 0.0 0.0 0:00.06 migration/2 9 root 34 19 0 0 0 S 0.0 0.0 0:00.03 ksoftirqd/2 10 root RT -5 0 0 0 S 0.0 0.0 0:00.00 watchdog/2 11 root RT -5 0 0 0 S 0.0 0.0 0:00.06 migration/3 12 root 34 19 0 0 0 S 0.0 0.0 0:00.04 ksoftirqd/3 13 root RT -5 0 0 0 S 0.0 0.0 0:00.00 watchdog/3 14 root RT -5 0 0 0 S 0.0 0.0 0:01.45 migration/4 15 root 34 19 0 0 0 S 0.0 0.0 0:00.01 ksoftirqd/4 16 root RT -5 0 0 0 S 0.0 0.0 0:00.00 watchdog/4 17 root RT -5 0 0 0 S 0.0 0.0 0:00.22 migration/5 18 root 34 19 0 0 0 S 0.0 0.0 0:00.01 ksoftirqd/5 19 root RT -5 0 0 0 S 0.0 0.0 0:00.00 watchdog/5 20 root RT -5 0 0 0 S 0.0 0.0 0:00.15 migration/6 21 root 34 19 0 0 0 S 0.0 0.0 0:00.02 ksoftirqd/6 22 root RT -5 0 0 0 S 0.0 0.0 0:00.00 watchdog/6 23 root RT -5 0 0 0 S 0.0 0.0 0:00.15 migration/7 24 root 34 19 0 0 0 S 0.0 0.0 0:00.01 ksoftirqd/7 25 root RT -5 0 0 0 S 0.0 0.0 0:00.00 watchdog/7 26 root RT -5 0 0 0 S 0.0 0.0 0:00.19 migration/8 27 root 34 19 0 0 0 S 0.0 0.0 0:00.04 ksoftirqd/8 28 root RT -5 0 0 0 S 0.0 0.0 0:00.00 watchdog/8 29 root RT -5 0 0 0 S 0.0 0.0 0:00.34 migration/9 30 root 34 19 0 0 0 S 0.0 0.0 0:00.03 ksoftirqd/9 31 root RT -5 0 0 0 S 0.0 0.0 0:00.00 watchdog/9 32 root RT -5 0 0 0 S 0.0 0.0 0:00.16 migration/10 33 root 34 19 0 0 0 S 0.0 0.0 0:00.04 ksoftirqd/10 34 root RT -5 0 0 0 S 0.0 0.0 0:00.00 watchdog/10 35 root RT -5 0 0 0 S 0.0 0.0 0:00.12 migration/11 36 root 34 19 0 0 0 S 0.0 0.0 0:00.05 ksoftirqd/11 37 root RT -5 0 0 0 S 0.0 0.0 0:00.00 watchdog/11 38 root RT -5 0 0 0 S 0.0 0.0 0:00.35 migration/12

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• Configuration of Sonicwall Load Balancing

  - by jacke672

  We installed a Sonicwall NSA 240 appliance and have configured it up for our SSL VPN connection and for load balancing with 2 ADSL lines. Over the past week, I have been testing the load balancing options to optimize the connection speeds for our users - but I've run into the following: Round Robin load balancing is the ideal load balancing setting and it's roughly doubling our throughput- but, when it's active users are unable to access any SSL enabled websites such as banking, web-mail, etc. For this reason, I have been using percentage based balancing as it allows me to enable source and destination IP binding, which doesn't 'break' any secure connections but were left with the slow connection speeds we had before adding the second line. I'm looking for a method in which we can take advantage of the round robin connection speeds while allowing users to access sites with SSL certificates, all while still allowing our remote (vpn) users to connect. Any help would be appreciated. Thanks

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• Setting up a router as a DNS server only

  - by Jacob R

  I have a Linksys WRT54GL router that I don't need anymore, since I had to buy a 3G capable router (Dovado 3GN). As I only have a 3G connection at home, I want to optimize it as much as possible. I want to setup a caching DNS server, including some blacklisting of ad domains. The router currently runs the DD-WRT firmware. Is it possible to use this router as an ordinary computer, running only a DNS server, disabling all other features such as DHCP, WLAN, etc? Connecting it to my other router, should I simply run a cable into the WAN-port of the Linksys router?

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• Perl program not getting executed in xampp

  - by user1867151

  I am very new to CGI programming in Perl. In order to learn it i installed xampp 2 days back. But I am unable to execute my perl code . The code goes as folows: #!/usr/bin/perl use CGI; $co = new CGI; print $co->header, $co->start_html(title=>'CGI Example'), $co->center($co->hi('Subhayan welcome to CGI')), $co->end_html; Have saved the code in a text file named : Subhayan1.cgi and kept it in the folder cgi-bin under xampp folder in C drive. When i try to execute this through my web browser typing : "http://localhost/cgi-bin/Subhayan1.cgi" it comes up with a "Object not found page". I checked the apache configuration file under : xampp/apache/conf/httpd.conf. I checked the entry : ScriptAlias /cgi-bin/ "C:/xampp/cgi-bin/" It looks like pointing to the correct directory. What is the issue here can anyone help please???

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• How to enable extended logging for classic asp on IIS7 on Windows 2008 R2

  - by Neil Trodden

  I had to deploy an application that was not written by me onto the above configuration. It is a rather bizarre hybrid of asp.net and classic asp and it's the classic asp that is proving troublesome. The client is having problems with 500 Internal Server Errors appearing and I can see some of these in the logs but I only get the error code and the page name but little else. What I would like to see is the actual error message to at least give me an idea what is going on (or not going on, depending on your point of view) I don't want to display errors in the browser as I don't know the code well enough and this could (for all I know) display some crazy code where the db password is hard-coded into the site.

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• Windows Malicious Software Removal Tool log says it can't do all required actions. Should I be conce

  - by Tom

  Here's what the log file c:/Windows/debug/mrt.log of my Windows 7 install says: WARNING: Security policy doesn't allow for all actions MSRT may require. ->Scan ERROR: resource process://pid:6080 (code 0x00000005 (5)) ->Scan ERROR: resource process://pid:5300 (code 0x00000057 (87)) ->Scan ERROR: resource process://pid:3512 (code 0x00000057 (87)) I use the default setup. I didn't change anything. This is the first time I checked the log file and this warning is in there from the start. Can I do something about it? Or I shouldn't be concerned, because it can do everything what's necessary anyway? Do you have this warning in your logfile?

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• How do I get meaningful error messages in IIS7?

  - by Petras

  I have a classic ASP website that is crashing in IIS7. It is crashing because IIS doesn't allow file uploads greater than a certain size. I know this because files below about 200k work fine. I removed the Status Code 500 error in IIS but I still don't get a file name and the line where my code failed as I do when running locally. Instead I get: "The page cannot be displayed because an internal server error has occurred. If you are the system administrator please click here to find out more about this error." How do I get a file name and the line where my code failed? Here are my IIS settings:

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• How is this modsec rule getting triggered?

  - by BipedalShark

  I made a GET request to the URL, http://domain.tld/test/docs/index.php?create_table=1&step=2 and got a 403 response code. It turns out this modsec rule is getting triggered: Access denied with code 403 (phase 2). Pattern match "(?:ogg|gopher|zlib|(?:ht|f)tps?)\:/" at ARGS:gltr_redir. [file "/opt/mod_security/10_asl_rules.conf"] [line "827"] [id "340153"] [rev "22"] [msg "Generic PHP code injection protection via ARGS 3"] [severity "CRITICAL"] I would assume ARGS refers to GET/POST data, but there's no gltr_redir in the query string. And, being a GET request, there's obviously no POST data. So how is this rule being triggered?

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• Setting up a router as a DNS server only

  - by Jacob R

  I have a Linksys WRT54GL router that I don't need anymore, since I had to buy a 3G capable router (Dovado 3GN). As I only have a 3G connection at home, I want to optimize it as much as possible. I want to setup a caching DNS server, including some blacklisting of ad domains. The router currently runs the DD-WRT firmware. Is it possible to use this router as an ordinary computer, running only a DNS server, disabling all other features such as DHCP, WLAN, etc? Connecting it to my other router, should I simply run a cable into the WAN-port of the Linksys router?

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• Executed PHP files are stale unitl "touched" (Symlinked NFS mount as web root)

  - by mmattax

  We have a PHP application that has 3 web servers (running Nginx and Apache). The web server's directory root are symlinked directories that point to an NFS mount. For example: web01 has an NFS mount at /data/webapp, which is symlinked to /home/webapp. Apache serves content from /home/webapp/www. We also use ACP for our PHP opcode cache. When we deploy code, we SCP an archive file to the NFS server and extract it. Since upgrading RedHat 6, when we deploy our code the webserver execute "stale" PHP files until touch is run on the PHP files. We thought that APC might be causing a problem, but the issue exists, even after clearing the opcode cache. Any ideas on how to diagnose why the stale PHP code is being executed?

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