php-cgi frozen with sbwait when SMP enable

Ken Chen ken73.chen at gmail.com
Fri Nov 7 07:08:20 PST 2008


I capture something.

Please check the PID 57776. It's CPU time never change since my previous
mail here.

web4# ps alx | grep php-cgi | grep -v grep | grep sbwait
65534 57776 47240   0   4  0 182328 84984 sbwait I     ??    2:02.12
/usr/local/bin/php-cgi
65534 57801 47240   0   4  0 182328 82408 sbwait I     ??    0:19.97
/usr/local/bin/php-cgi
65534 57809 47240   0   4  0 182328 84096 sbwait I     ??    1:12.03
/usr/local/bin/php-cgi
65534 57823 47240   0   4  0 182328 84492 sbwait I     ??    2:04.21
/usr/local/bin/php-cgi
65534 57833 47240   0   4  0 183352 83316 sbwait I     ??    0:28.62
/usr/local/bin/php-cgi
65534 57866 47240   0   4  0 182328 79952 sbwait I     ??    0:05.92
/usr/local/bin/php-cgi
65534 57870 47240   0   4  0 182328 83184 sbwait I     ??    0:56.83
/usr/local/bin/php-cgi
65534 57871 47240   0   4  0 182328 83388 sbwait I     ??    0:54.96
/usr/local/bin/php-cgi
65534 57891 47240   0   4  0 182328 84436 sbwait I     ??    1:58.32
/usr/local/bin/php-cgi
65534 57925 47240   0   4  0 182328 84380 sbwait I     ??    2:03.53
/usr/local/bin/php-cgi
65534 65944 47240   0   4  0 182328 84184 sbwait I     ??    0:39.97
/usr/local/bin/php-cgi
65534 65952 47240   0   4  0 182328 84408 sbwait I     ??    0:21.37
/usr/local/bin/php-cgi
65534 66007 47240   0   4  0 183352 90960 sbwait I     ??    1:16.81
/usr/local/bin/php-cgi
65534 66014 47240   5   4  0 182328 92748 sbwait S     ??    1:41.23
/usr/local/bin/php-cgi
65534 66038 47240   1   4  0 182328 91900 sbwait I     ??    1:38.04
/usr/local/bin/php-cgi
65534 66060 47240   0   4  0 182328 90048 sbwait I     ??    1:15.46
/usr/local/bin/php-cgi
65534 66078 47240   3   4  0 182328 92224 sbwait S     ??    1:39.66
/usr/local/bin/php-cgi
web4# top -b
last pid: 70768;  load averages:  1.62,  1.65,  1.43  up 4+15:56:06
22:53:48
85 processes:  1 running, 84 sleeping

Mem: 492M Active, 1204M Inact, 218M Wired, 60M Cache, 112M Buf, 27M Free
Swap: 2019M Total, 20K Used, 2019M Free


  PID USERNAME  THR PRI NICE   SIZE    RES STATE  C   TIME   WCPU COMMAND
69544 nobody      1   8    0   203M 38500K nanslp 1   6:31 11.33% php
47290 nobody      1   4    0   101M    98M kqread 1  30:42  2.98% lighttpd
66526 nobody      1   4    0   178M 92796K accept 1   1:40  1.12% php-cgi
66077 nobody      1   4    0   178M 92512K accept 0   1:49  1.07% php-cgi
65921 nobody      1   4    0   178M 92696K accept 0   1:43  0.98% php-cgi
65968 nobody      1   4    0   178M 92484K accept 0   1:43  0.93% php-cgi
66017 nobody      1   4    0   178M 92444K accept 0   1:50  0.88% php-cgi
65979 nobody      1   4    0   178M 92676K accept 1   1:44  0.88% php-cgi
66424 nobody      1   4    0   178M 92928K accept 1   1:36  0.88% php-cgi
65938 nobody      1   4    0   178M 92336K accept 1   1:52  0.73% php-cgi
65951 nobody      1   4    0   178M 92704K accept 0   1:48  0.73% php-cgi
66016 nobody      1   4    0   178M 92232K accept 1   1:41  0.73% php-cgi
65950 nobody      1   4    0   178M 93192K accept 0   1:51  0.68% php-cgi
65999 nobody      1   4    0   178M 92940K accept 1   1:46  0.63% php-cgi
66008 nobody      1   4    0   178M 93000K accept 1   1:46  0.63% php-cgi
69286 nobody      1   4    0   178M 92208K accept 1   0:37  0.63% php-cgi
47289 nobody      1   4    0 73400K 70640K kqread 1  12:02  0.59% lighttpd
65980 nobody      1   4    0   178M 93156K accept 1   1:51  0.59% php-cgi
2008/11/7 Ivan Voras <ivoras at freebsd.org>

> Ken Chen wrote:
> > Oh.. sorry, I forgot to provide the information of my environment.
> >
> > web4# php-cgi -v
> > PHP 5.2.6 (cgi-fcgi) (built: Nov  2 2008 11:16:30)
> > Copyright (c) 1997-2008 The PHP Group
> > Zend Engine v2.2.0, Copyright (c) 1998-2008 Zend Technologies
> >     with XCache v1.2.2, Copyright (c) 2005-2007, by mOo
> > web4# /usr/local/lighttpd/sbin/lighttpd -v
> > lighttpd-1.4.19 - a light and fast webserver
> > Build-Date: Sep  1 2008 16:58:51
> > web4# uname -a
> > FreeBSD web4.xxxx.com 7.0-RELEASE-p5 FreeBSD 7.0-RELEASE-p5 #11: Mon Nov
>  3
> > 01:10:36 CST 2008     root at web4.xxxx.com:/usr/obj/usr/src/sys/WEB4  i386
> > web4# ps alx | grep php-cgi | grep -v grep | grep sbwait
> > 65534 57776 47240   0   4  0 182328 84984 sbwait I     ??    2:02.12
> > /usr/local/bin/php-cgi
> > 65534 57801 47240   0   4  0 182328 82408 sbwait I     ??    0:19.97
> > /usr/local/bin/php-cgi
> > 65534 57809 47240   0   4  0 182328 84096 sbwait I     ??    1:12.03
> > /usr/local/bin/php-cgi
> > 65534 57823 47240   0   4  0 182328 84492 sbwait I     ??    2:04.21
> > /usr/local/bin/php-cgi
> > 65534 57833 47240   0   4  0 183352 83316 sbwait I     ??    0:28.62
> > /usr/local/bin/php-cgi
> > 65534 57866 47240   0   4  0 182328 79952 sbwait I     ??    0:05.92
> > /usr/local/bin/php-cgi
> > 65534 57870 47240   0   4  0 182328 83184 sbwait I     ??    0:56.83
> > /usr/local/bin/php-cgi
> > 65534 57871 47240   0   4  0 182328 83388 sbwait I     ??    0:54.96
> > /usr/local/bin/php-cgi
> > 65534 57891 47240   0   4  0 182328 84436 sbwait I     ??    1:58.32
> > /usr/local/bin/php-cgi
> > 65534 57925 47240   0   4  0 182328 84380 sbwait I     ??    2:03.53
> > /usr/local/bin/php-cgi
> > 65534 65944 47240   0   4  0 182328 84184 sbwait I     ??    0:39.97
> > /usr/local/bin/php-cgi
> > 65534 65952 47240   0   4  0 182328 84408 sbwait I     ??    0:21.37
> > /usr/local/bin/php-cgi
>
> This does seem a bit unusual, but seeing that your execution times are
> not null it might that the PHP servers are actually doing some useful
> work. You should have a mixture of various states in PHP - do they show
> up in top?
>
> My own example is:
>
> last pid: 77421;  load averages:  2.82,  2.59,  2.13
>                                                            up
> 55+16:58:49  15:48:16
> 209 processes: 2 running, 206 sleeping, 1 zombie
> CPU: 49.8% user,  0.0% nice,  2.8% system,  0.0% interrupt, 47.4% idle
> Mem: 1493M Active, 1583M Inact, 278M Wired, 139M Cache, 112M Buf, 505M Free
> Swap: 4500M Total, 416M Used, 4084M Free, 9% Inuse
>
>  PID USERNAME  THR PRI NICE   SIZE    RES STATE  C   TIME   WCPU COMMAND
> 75863 www         1   4    0   162M 50020K sbwait 3   2:54 36.77% php-cgi
> 76830 www         1 103    0   156M 41556K CPU2   3   1:28 36.77% php-cgi
> 76834 www         1   4    0   163M 56628K sbwait 0   2:23 33.59% php-cgi
> 76019 www         1   4    0   150M 38948K accept 3   3:12 20.56% php-cgi
> 76825 www         1   4    0   158M 42912K accept 2   1:21 18.16% php-cgi
> 76846 www         1   4    0   162M 42600K sbwait 1   1:07 14.36% php-cgi
> 76835 www         1   4    0   151M 39948K accept 2   1:28 12.60% php-cgi
> 76829 www         1   4    0   150M 36564K sbwait 2   1:46  2.98% php-cgi
>
> This is unusually high load, a spike, for this server but it has many
> cores and it's stable. It's also running 7.1-PRERELEASE.
>
>


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