title: php-fpm stop many times a day
body: <p>I installed on a Centos 6 Server to host a Wordpress busy blog:</p>
  
  <p>CPU: Intel Xeon E3 1245v2 - 4 Cores - 8 Threads
  RAM: 32 Go DDR3</p>
  
  <p>Nginx, PHP-FPM, and APC</p>
  
  <p>Version:</p>
  
  <p>PHP 5.4.9 (fpm-fcgi) (built: Nov 22 2012 11:33:35)</p>
  
  <p>nginx version: nginx/1.2.5</p>
  
  <p>The website was working first days, and I used UNIX sockets instead of TCP</p>
  
  <p>Error Log of PHP-FPM:</p>
  
  <pre><code>[14-Dec-2012 01:33:45] WARNING: [pool www] seems busy (you may need to increase                                                                                         pm.start_servers, or pm.min/max_spare_servers), spawning 32 children, there are                                                                                         3 idle, and 205 total children
  [14-Dec-2012 01:34:08] WARNING: [pool www] seems busy (you may need to increase                                                                                         pm.start_servers, or pm.min/max_spare_servers), spawning 8 children, there are 3                                                                                         idle, and 222 total children
  [14-Dec-2012 01:34:35] WARNING: [pool www] seems busy (you may need to increase                                                                                         pm.start_servers, or pm.min/max_spare_servers), spawning 8 children, there are 0                                                                                         idle, and 240 total children
  [14-Dec-2012 01:34:44] WARNING: [pool www] server reached pm.max_children settin                                                                                        g (250), consider raising it
  [14-Dec-2012 14:21:22] NOTICE: Terminating ...
  [14-Dec-2012 14:21:22] NOTICE: exiting, bye-bye!
  [14-Dec-2012 14:21:23] NOTICE: fpm is running, pid 2345
  [14-Dec-2012 14:21:23] NOTICE: ready to handle connections
  [14-Dec-2012 14:21:30] WARNING: [pool www] seems busy (you may need to increase                                                                                         pm.start_servers, or pm.min/max_spare_servers), spawning 8 children, there are 4                                                                                         idle, and 9 total children
  [14-Dec-2012 14:24:39] WARNING: [pool www] child 2354 exited on signal 7 (SIGBUS                                                                                        ) after 191.690193 seconds from start
  [14-Dec-2012 14:24:39] NOTICE: [pool www] child 2510 started
  </code></pre>
  
  <p>I increased pm.max_children value but without any success</p>
  
  <p>PHP-FPM Config:</p>
  
  <pre><code>; If this number of child processes exit with SIGSEGV or SIGBUS within the time
  ; interval set by emergency_restart_interval then FPM will restart. A value
  ; of '0' means 'Off'.
  ; Default Value: 0
  emergency_restart_threshold = 10
  
  ; Interval of time used by emergency_restart_interval to determine when
  ; a graceful restart will be initiated.  This can be useful to work around
  ; accidental corruptions in an accelerator's shared memory.
  ; Available Units: s(econds), m(inutes), h(ours), or d(ays)
  ; Default Unit: seconds
  ; Default Value: 0
  emergency_restart_interval = 1m
  
  ; Time limit for child processes to wait for a reaction on signals from master.
  ; Available units: s(econds), m(inutes), h(ours), or d(ays)
  ; Default Unit: seconds
  ; Default Value: 0
  process_control_timeout = 10s
  </code></pre>
  
  <p>Default Pool config:</p>
  
  <pre><code>; The number of child processes to be created when pm is set to 'static' and the
  ; maximum number of child processes to be created when pm is set to 'dynamic'.
  ; This value sets the limit on the number of simultaneous requests that will be
  ; served. Equivalent to the ApacheMaxClients directive with mpm_prefork.
  ; Equivalent to the PHP_FCGI_CHILDREN environment variable in the original PHP
  ; CGI.
  ; Note: Used when pm is set to either 'static' or 'dynamic'
  ; Note: This value is mandatory.
  pm.max_children = 250
  
  ; The number of child processes created on startup.
  ; Note: Used only when pm is set to 'dynamic'
  ; Default Value: min_spare_servers + (max_spare_servers - min_spare_servers) / 2
  pm.start_servers = 5
  
  ; The desired minimum number of idle server processes.
  ; Note: Used only when pm is set to 'dynamic'
  ; Note: Mandatory when pm is set to 'dynamic'
  pm.min_spare_servers = 5
  
  ; The desired maximum number of idle server processes.
  ; Note: Used only when pm is set to 'dynamic'
  ; Note: Mandatory when pm is set to 'dynamic'
  pm.max_spare_servers = 70
  
  ; The number of requests each child process should execute before respawning.
  ; This can be useful to work around memory leaks in 3rd party libraries. For
  ; endless request processing specify '0'. Equivalent to PHP_FCGI_MAX_REQUESTS.
  ; Default Value: 0
  ;pm.max_requests = 500
  </code></pre>