Проблема с php-fpm

[<maxhl@xxxxxxxxxxxxxx>]

Заметил странную проблему

last pid: 75379;  load averages:  3.02,  3.02,  2.97 
up 0+23:49:21  09:45:17
74 processes:  4 running, 70 sleeping
CPU: 99.8% user,  0.0% nice,  0.0% system,  0.2% interrupt,  0.0% idle
Mem: 576M Active, 416M Inact, 224M Wired, 52K Cache, 199M Buf, 778M Free
Swap: 4046M Total, 4046M Free

 PID USERNAME  THR PRI NICE   SIZE    RES STATE  C   TIME   WCPU COMMAND
73908 nobody      1 113    0   417M 13756K CPU0   0  65:04 80.37% php-cgi
73910 nobody      1 112    0   417M 13592K RUN    1  64:11 75.00% php-cgi
70634 nobody      1 107    0   417M 13664K RUN    1 260:34 55.18% php-cgi

Тоесть 3 воркера груят систему на 100% ... при какиех условиях возникает 
непонятно ...
Aug 11 09:04:12.585200 [NOTICE] fpm_got_signal(), line 73: received SIGCHLD
Aug 11 09:04:12.585255 [NOTICE] fpm_children_bury(), line 229: child 74434 
(pool default) exited with code 0 after 1474.933763 seconds
Aug 11 09:04:12.585638 [NOTICE] fpm_children_make(), line 305: child 74767 
(pool default) started
Aug 11 09:04:43.543547 [NOTICE] fpm_got_signal(), line 73: received SIGCHLD
Aug 11 09:04:43.543603 [NOTICE] fpm_children_bury(), line 229: child 74433 
(pool default) exited with code 0 after 1551.383934 seconds
Aug 11 09:04:43.543989 [NOTICE] fpm_children_make(), line 305: child 74768 
(pool default) started
Aug 11 09:34:43.432139 [NOTICE] fpm_got_signal(), line 73: received SIGCHLD
Aug 11 09:34:43.432197 [NOTICE] fpm_children_bury(), line 229: child 74767 
(pool default) exited with code 0 after 1830.846480 seconds
Aug 11 09:34:43.432585 [NOTICE] fpm_children_make(), line 305: child 75157 
(pool default) started
Aug 11 09:35:59.247849 [NOTICE] fpm_got_signal(), line 73: received SIGCHLD
Aug 11 09:35:59.247906 [NOTICE] fpm_children_bury(), line 229: child 74768 
(pool default) exited with code 0 after 1875.703811 seconds
Aug 11 09:35:59.248298 [NOTICE] fpm_children_make(), line 305: child 75195 
(pool default) started