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11/15/2007 at 05:02AM PST, ID: 22962665
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6.4

Apache 2.0 (httpd-2.0.52) mod_perl-2.0.2 parent processes continously getting larger unitl reboot

Asked by barnster123 in Apache Web Server, Perl Programming Language, Red Hat Linux

Tags: controls, httpd, mod_perl, parent, processes

We use an Perl handler for one of our web sites. Thorught the day, apache parent processes cconsume more and more memory until eventually the serverr uns out of memeory. We now reboot nightly.
We suspect mod_perl is leaking somewhere. Having refined the httpd config
If you look the sar -r output below you will see that the processes get much larger before the reboot.

# prefork MPM
# StartServers: number of server processes to start
# MinSpareServers: minimum number of server processes which are kept spare
# MaxSpareServers: maximum number of server processes which are kept spare
# MaxClients: maximum number of server processes allowed to start
# MaxRequestsPerChild: maximum number of requests a server process serves
<IfModule mpm_prefork_module>
    StartServers         8
    MinSpareServers      10
    MaxSpareServers      50
    ServerLimit         512
    MaxClients          512
    MaxRequestsPerChild 60
</IfModule>

So as to stop child processes consuming too much memory.

It may be a better idea to kill off children when they reach a certain size. However this does not reduce the size of the parent process. I am suspecting that dirty chidren are messing up the server processes memory.

Has anyone else come accorss this and might know a possibel fix.
uname -a
Linux esrh02.eskills.local 2.6.9-5.ELsmp #1 SMP Wed Jan 5 19:30:39 EST 2005 i686 i686 i386 GNU/Linux

top

top - 12:54:04 up  4:37,  1 user,  load average: 1.17, 1.02, 0.68
Tasks:  90 total,   1 running,  86 sleeping,   0 stopped,   3 zombie
Cpu(s): 13.9% us,  2.6% sy,  0.0% ni, 57.6% id,  4.1% wa,  0.2% hi, 21.5% si
Mem:   4150004k total,   770960k used,  3379044k free,    37464k buffers
Swap:  2096472k total,        0k used,  2096472k free,   357216k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
 8573 daemon    15   0 65308  54m 6236 S    2  1.3   0:01.48 /etc/httpd/apache2/bin/httpd -k start
 8308 daemon    16   0 64800  53m 6188 S    1  1.3   0:01.38 /etc/httpd/apache2/bin/httpd -k start
 8593 daemon    16   0 59952  48m 6184 S    0  1.2   0:01.12 /etc/httpd/apache2/bin/httpd -k start
 8208 daemon    15   0 54044  42m 6192 S    3  1.1   0:00.94 /etc/httpd/apache2/bin/httpd -k start
 8373 daemon    16   0 50652  39m 6232 S    0  1.0   0:00.51 /etc/httpd/apache2/bin/httpd -k start
 9306 daemon    16   0 47636  36m 6164 S    1  0.9   0:00.38 /etc/httpd/apache2/bin/httpd -k start
 9252 daemon    15   0 47428  36m 6220 S    0  0.9   0:00.45 /etc/httpd/apache2/bin/httpd -k start
 9332 daemon    15   0 47416  36m 6152 S    0  0.9   0:00.49 /etc/httpd/apache2/bin/httpd -k start
 9331 daemon    20   0 47416  36m 6152 S    0  0.9   0:00.51 /etc/httpd/apache2/bin/httpd -k start
 9333 daemon    16   0 47416  36m 6152 S    0  0.9   0:00.50 /etc/httpd/apache2/bin/httpd -k start
 9438 daemon    16   0 47260  36m 6156 S   10  0.9   0:00.30 /etc/httpd/apache2/bin/httpd -k start
 9334 daemon    16   0 42384  31m 6156 S    1  0.8   0:00.10 /etc/httpd/apache2/bin/httpd -k start
 9437 daemon    17   0 42244  31m 6184 S    3  0.8   0:00.09 /etc/httpd/apache2/bin/httpd -k start
 9307 daemon    15   0 42120  31m 6156 S    0  0.8   0:00.08 /etc/httpd/apache2/bin/httpd -k start
 9511 daemon    16   0 41732  30m 6156 S    1  0.8   0:00.04 /etc/httpd/apache2/bin/httpd -k start
 9399 daemon    15   0 40884  30m 6044 S    0  0.7   0:00.00 /etc/httpd/apache2/bin/httpd -k start
 9510 daemon    16   0 40884  30m 6044 S    0  0.7   0:00.00 /etc/httpd/apache2/bin/httpd -k start
 9512 daemon    16   0 40884  30m 6044 S    0  0.7   0:00.00 /etc/httpd/apache2/bin/httpd -k start
 9509 daemon    16   0 40884  30m 6040 S    0  0.7   0:00.00 /etc/httpd/apache2/bin/httpd -k start
 9171 root      16   0 40748  30m 5972 S    0  0.7   0:06.94 /etc/httpd/apache2/bin/httpd -k start


sar -r

06:45:01      1194156   2955848     71.23    146428   2054992   2096472         0      0.00         0
06:50:01      1161716   2988288     72.01    146432   2054988   2096472         0      0.00         0
06:55:01      1080868   3069136     73.96    146432   2055248   2096472         0      0.00         0
07:00:01      1076268   3073736     74.07    146432   2055248   2096472         0      0.00         0
07:05:01      1058716   3091288     74.49    146444   2055496   2096472         0      0.00         0
07:10:01      1050348   3099656     74.69    146448   2055232   2096472         0      0.00         0
07:15:01      1048812   3101192     74.73    146452   2055488   2096472         0      0.00         0
07:20:01      1006484   3143520     75.75    146460   2055740   2096472         0      0.00         0
07:25:01      1004812   3145192     75.79    146464   2055736   2096472         0      0.00         0
07:30:01       996316   3153688     75.99    146484   2055716   2096472         0      0.00         0
07:35:01       973940   3176064     76.53    146484   2055976   2096472         0      0.00         0
07:40:01       881820   3268184     78.75    146496   2055704   2096472         0      0.00         0
07:45:01       802020   3347984     80.67    146496   2055964   2096472         0      0.00         0
07:50:01       744364   3405640     82.06    146500   2056220   2096472         0      0.00         0
07:55:01       697444   3452560     83.19    146516   2056464   2096472         0      0.00         0
08:00:01       607076   3542928     85.37    146516   2056724   2096472         0      0.00         0
08:05:01       417588   3732416     89.94    146780   2097020   2096472         0      0.00         0
08:10:01       868324   3281680     79.08    146780   2097280   2096472         0      0.00         0
08:15:01      1134988   3015016     72.65    146780   2097800   2096472         0      0.00         0
Average:      1765621   2384383     57.45    106704   1505992   2096472         0      0.00         0

08:17:03          LINUX RESTART

08:20:01    kbmemfree kbmemused  %memused kbbuffers  kbcached kbswpfree kbswpused  %swpused  kbswpcad
08:25:01      3823604    326400      7.87     14980    114500   2096472         0      0.00         0
08:30:01      3699612    450392     10.85     15916    122144   2096472         0      0.00         0
08:35:01      3732116    417888     10.07     16760    128060   2096472         0      0.00         0
08:40:01      3377988    772016     18.60     17488    134352   2096472         0      0.00         0
08:45:01      3617596    532408     12.83     18116    137104   2096472         0      0.00         0
08:50:01      3816556    333448      8.03     18504    138276   2096472         0      0.00         0
08:55:01      3746780    403224      9.72     18972    143008   2096472         0      0.00         0
09:00:01      3615420    534584     12.88     19408    143612   2096472         0      0.00         0
09:05:01      3578780    571224     13.76     19716    143824   2096472         0      0.00         0
09:10:01      3811036    338968      8.17     20160    145200   2096472         0      0.00         0
09:15:01      3726708    423296     10.20     20552    145588   2096472         0      0.00         0
09:20:01      3632604    517400     12.47     20896    146024   2096472         0      0.00         0
09:25:01      3516716    633288     15.26     21224    148816   2096472         0      0.00         0
09:30:01      3441916    708088     17.06     21564    158876   2096472         0      0.00         0
09:35:01      3355004    795000     19.16     21892    164008   2096472         0      0.00         0
09:40:01      3353068    796936     19.20     22256    166244   2096472         0      0.00         0
09:45:01      3683916    466088     11.23     23188    172072   2096472         0      0.00         0
09:50:01      3603108    546896     13.18     23776    172524   2096472         0      0.00         0
09:55:01      3534132    615872     14.84     24112    173748   2096472         0      0.00         0
10:00:01      3564852    585152     14.10     24480    174420   2096472         0      0.00         0

vmstat
procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in    cs us sy id wa
 0  0      0 3157604  37580 363340    0    0    10    21  551   122  4  1 93  3

free
             total       used       free     shared    buffers     cached
Mem:       4150004     954320    3195684          0      37608     363832
-/+ buffers/cache:     552880    3597124
Swap:      2096472          0    2096472

# Kernel sysctl configuration file for Red Hat Linux
#
# For binary values, 0 is disabled, 1 is enabled.  See sysctl(8) and
# sysctl.conf(5) for more details.

# Controls IP packet forwarding
net.ipv4.ip_forward = 0

# Controls source route verification
net.ipv4.conf.default.rp_filter = 1

# Do not accept source routing
net.ipv4.conf.default.accept_source_route = 0

# Controls the System Request debugging functionality of the kernel
kernel.sysrq = 0

# Controls whether core dumps will append the PID to the core filename.
# Useful for debugging multi-threaded applications.
kernel.core_uses_pid = 1


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About this solution

Zones: Apache Web Server, Perl Programming Language, Red Hat Linux
Tags: controls, httpd, mod_perl, parent, processes
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Solution Provided By: henrysimpson
Participating Experts: 3
Solution Grade: B
 
 
 
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