Tomasz Chmielewski schrieb:
I have Apache 2.2.3 server, which over time (a couple of days) uses lots
of memory. What uses lots of memory? Apache processes which do not want
to die for some reason.
The server can have only 10-20 active connections to httpd (as reported
by netstat's ESTABLISHED), but in the same time, there can be 80, 100,
120 or more httpd processes (the longer httpd was not restarted, the
more httpd processes will run, till memory and swap are full and
OOM-killer will start to kill processes).
Short term, httpd processes are created and killed (exit), but longer
term, after several hours, I can see that more and more httpd processes
are running.
How can I trace what causes this misbehaviour? Perhaps it's some PHP
code which never exits.
I always used strace to check various malfunctioning, but I think it'd
be an overkill here, and perhaps there is a better way to check what
httpd processes were doing and how long did it take them.
My issue looks very similar to the one described (and not solved) here:
http://www.webhostingtalk.com/showthread.php?t=670621
In short, stracing a httpd process stops on LOCK_EX:
$ strace -p 3230
06:57:12
open("/var/lib/php/session/sess_86ecf346c6f7adba93cb1077f6b95d43",
O_RDWR|O_CREAT,
0600) = 44
06:57:12 flock(44, LOCK_EX
And "lsof" shows that such session files are being accessed by many
httpd processes (each wanting to have an exclusive lock, which will
block all other instances).
Hmm, what should I do?
--
Tomasz Chmielewski
http://wpkg.org
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