# Server performance issue **URL:** \ **Category:** NGINX\ **Created:** [October 26, 2010, 8:43am UTC](https://www.ruby-forum.com/t/server-performance-issue/198087 "2010-10-26T08:43:36Z")\ **Posts on this page:** 2\ **Page:** 2
**Author:** ![Xin\_L](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/x/3be4f8/32.png) [@Xin\_L](https://www.ruby-forum.com/u/Xin_L)\ **Post date:** [October 26, 2010, 6:01pm UTC](https://www.ruby-forum.com/t/server-performance-issue/198087/21 "2010-10-26T18:01:28Z")
Thank you very much for your reply. After checked system log, I found that there are some errors about disk sdb. It seems that one disk is broken(I have 2 disks with Raid1.) Im wondering maybe my problem is caused by disk error. Tomorrow I will rebuild the Raid, Ill keep on monitoring : Ilan B. [[mailto:removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)] ʱ: 20101026 22:21 ռ: removed\_email\_address@domain.invalid : Re: : server performance issue You’re issue is probably not with php-fpm. Without knowing more about your architecture, these are key points you should look at: 1. What is your PHP code doing? What is it waiting for? Tools: xdebug ([http://www.xdebug.org/](http://www.xdebug.org/)) and you could even try tracking it via the php-fpm slow log configuration option: request\_slowlog\_timeout - The timeout (in seconds) for serving of single request after which a php backtrace will be dumped to slow.log file. Default: “5s”. Note: ‘0s’ means ‘off’ slowlog - The log file for slow requests. 1. How is your database performing? Are there issues with queries? again, look at the slow log query output of mysql. Look at connection issues and name resolution with mysql (its notoriously bad at host name resolution). 2. If your site is really busy, you may need to add more PHP application servers to handle the load. Again, this is not a Nginx or PHP-FPM problem per se. 2010/10/26 Xin L. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) Even I set the pm.max\_children=50, I still got lots of errors… Oct 26 22:09:36.354159 [WARNING] [pool www] seems busy (you may need to increase start\_servers, or min/max\_spare\_servers), spawning 8 children, there are 0 idle, and 12 total children Oct 26 22:09:37.354215 [WARNING] [pool www] seems busy (you may need to increase start\_servers, or min/max\_spare\_servers), spawning 16 children, there are 0 idle, and 17 total children Oct 26 22:11:20.650232 [WARNING] [pool www] seems busy (you may need to increase start\_servers, or min/max\_spare\_servers), spawning 8 children, there are 1 idle, and 17 total children Oct 26 22:11:41.246244 [WARNING] [pool www] seems busy (you may need to increase start\_servers, or min/max\_spare\_servers), spawning 16 children, there are 0 idle, and 21 total children : Phil B. [[mailto:removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)] ʱ: 20101026 19:07 ռ: removed\_email\_address@domain.invalid : Re: server performance issue Your formulas look interesting, will give them a try next time I’m doing some optimising. Normally I would just make a rough guess based off req/sec, execution times etc and fine tune with ab. On 26 October 2010 11:58, SplitIce [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: ive found that if you have no blocking functions in php, aka its CPU bound then number of CPU cores+1 is the most efficient. If it has mysql (most likely does) and other IO bound operations then \*2 or \*3 is fine. values between 20-30 are common in decent scale web servers, in fact on my i7 8gb ram I run 20, on my amd x2 4gb ram I run 15. On Tue, Oct 26, 2010 at 9:52 PM, Phil B. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: Sorry didn’t read you config before posting, you already have this. 🙂 You probably need to reduce the number of child processes, more is not better. On intensive PHP applications I’ve found lower is better. For example, if you have 100 concurrent connections, this doesn’t mean you necessarily need 100 PHP-FPM children. * * * nginx mailing list removed\_email\_address@domain.invalid [http://nginx.org/mailman/listinfo/nginx](http://nginx.org/mailman/listinfo/nginx) – Warez Scene [http://thewarezscene.org](http://thewarezscene.org) Free Rapidshare Downloads [http://www.nexusddl.com](http://www.nexusddl.com) * * * nginx mailing list removed\_email\_address@domain.invalid [http://nginx.org/mailman/listinfo/nginx](http://nginx.org/mailman/listinfo/nginx) ---
**Author:** ![Xin\_L](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/x/3be4f8/32.png) [@Xin\_L](https://www.ruby-forum.com/u/Xin_L)\ **Post date:** [October 26, 2010, 11:18pm UTC](https://www.ruby-forum.com/t/server-performance-issue/198087/22 "2010-10-26T23:18:11Z")
Those message only occur with pm dynamic Sent from my iPod [Previous page](https://www.ruby-forum.com/t/server-performance-issue/198087.md?page=1)