php-fpm runs 100% on reboot but not restart

[dvl@]

I have a FreeBSD jail with php55-5.5.27 installed. After the jail is restarted (booted), I see this:

last pid: 32067;  load averages:  6.76,  6.58,  6.08                                                                                                        up 0+02:04:41  20:24:05
24 processes:  6 running, 18 sleeping
CPU: 46.7% user,  0.0% nice, 32.0% system,  0.0% interrupt, 21.3% idle
Mem: 2293M Active, 2278M Inact, 16G Wired, 3164K Cache, 11G Free
ARC: 12G Total, 10G MFU, 755M MRU, 9872K Anon, 544M Header, 543M Other
Swap: 2048M Total, 2048M Free

  PID USERNAME    THR PRI NICE   SIZE    RES STATE   C   TIME    WCPU COMMAND
16450 www           1 103    0   234M 23144K CPU5    5  21:09 100.00% php-fpm
16829 www           1 103    0   234M 23148K CPU7    7  21:09 100.00% php-fpm
16831 www           1 103    0   234M 23148K CPU0    0  21:07 100.00% php-fpm
15760 www           1 103    0   234M 23144K CPU3    3  21:10  98.97% php-fpm
15759 www           1 103    0   234M 23144K CPU6    6  21:11  98.88% php-fpm

Restarting the service settles it. I don't want to do this every time the jail (or the host) restarts.

Have you seen this before?

 

[dvl@]

Oops. See also https://forums.freebsd.org/threads/php-fpm-5-4-13-takes-up-all-cpu-resources.38835/page-2 where this seems to be a long standing issue.

 

[dvl@]

I found a clue here: http://serverfault.com/questions/65...te-enough-children-and-stops-serving-requests

In /usr/local/etc/php-fpm.conf I changed

pm = dynamic

to

pm = ondemand

NOTE: This merely delayed the problem until the first request arrived.

 

[dvl@]

I have abandoned Nginx & php-fpm and moved to Apache & mod_rewrite.

 

[junovitch@]

Perhaps doing a kldload dtraceall and something like perl /usr/share/dtrace/toolkit/hotuser -p <PID> will help give some clues on what PHP is doing.