答复: 答复: server performance issue

Tue Oct 26 19:59:28 MSD 2010

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.)

I’m wondering maybe my problem is caused by disk error. Tomorrow I will
rebuild the Raid, I’ll keep on monitoring…

发件人: Ilan Berkner [mailto:iberkner at gmail.com] 
发送时间: 2010年10月26日 22:21
收件人: nginx at nginx.org
主题: Re: 答复: 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/) 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.

2. 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).

3. 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 Liu <liuxin84 at gmail.com>

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

发件人: Phil Bayfield [mailto:phil at techlightenment.com] 
发送时间: 2010年10月26日 19:07
收件人: nginx at nginx.org
主题: 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 <mat999 at gmail.com> 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 Bayfield <phil at techlightenment.com>
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.

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