Find why httpd eats all swap

[John Steel <john.steel@xxxxxxxxxxxxxxx>]

Could someone cast an eye over this please - eventually swap fills and 
the server dies. Its under very light load, a few php sites, some direct 
html pages, some perl and java.

First the system spec:

[root@master conf]# uname -r
2.6.17-1.2142_FC4smp
[root@master conf]# httpd -version
Server version: Apache/2.0.54
Server built:   Jul 26 2006 11:00:19

Check memory:

[root@master conf]# free -m
            total       used       free     shared    buffers     cached
Mem:           740        732          8          0          6        102
-/+ buffers/cache:        623        117
Swap:         1027        479        548

Ugh! Swapping already...I know how to fix it though, but before I do 
does this look normal?

[root@master conf]# ps aux | grep httpd

root     12308  0.0  1.0  40396  8068 ?        Ss   05:17   0:00 
/usr/sbin/httpd
root     12316  0.0  0.1  27344  1364 ?        S    05:17   0:00 
/usr/sbin/httpd
apache   12317  0.0  5.2 165640 39724 ?        S    05:17   0:17 
/usr/sbin/httpd
apache   12318  0.0  5.4 167080 41508 ?        S    05:17   0:20 
/usr/sbin/httpd
apache   12319  0.0  6.1 166944 46832 ?        S    05:17   0:18 
/usr/sbin/httpd
apache   12320  0.0  6.0 167876 45668 ?        S    05:17   0:16 
/usr/sbin/httpd
apache   12321  0.0  5.6 170532 43212 ?        S    05:17   0:16 
/usr/sbin/httpd
apache   12322  0.0  5.4 157364 41668 ?        S    05:17   0:18 
/usr/sbin/httpd
apache   12323  0.0  7.2 175876 54704 ?        S    05:17   0:15 
/usr/sbin/httpd
apache   12324  0.0  5.6 165480 42580 ?        S    05:17   0:17 
/usr/sbin/httpd
apache   17780  0.0  5.7 147496 43644 ?        S    07:00   0:16 
/usr/sbin/httpd
root     11529  0.0  0.0   3948   600 pts/0    R+   14:54   0:00 grep httpd

httpd is taking 53% of RAM Alright lets free some up:

[root@master conf]# service httpd restart
Stopping httpd:                                            [  OK  ]
Starting httpd:                                            [  OK  ]

Check again:

[root@master conf]# free -m
            total       used       free     shared    buffers     cached
Mem:           740        409        330          0          7        110
-/+ buffers/cache:        292        448
Swap:         1027        280        747

Bingo! Restarting httpd had a big effect on swap. I would love to know 
exactly what those httpd children were doing - is there an easy way to 
tell please?

Thanks

--
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john.steel@xxxxxxxxxxxxxxx


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