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From "Arnab Ganguly" <agangul...@gmail.com>
Subject Re: [users@httpd] Apache Not Releasing Memory 2.2.0 using Moodle
Date Mon, 21 Apr 2008 12:24:17 GMT
Hi All,
Can you tell me what is the output you get when you run the free -m
command.Also when the process is idle it won't release the memory back.I
guess it will be put in the Swap space of OS.top -p pid won't be coming
down.

Also I see from the configuration file both perfork and worker is being used
is it so?I am not clear about the configuration.Are you getting any crash on
the Apache?
Thanks
-A

On Mon, Apr 21, 2008 at 1:21 PM, Terence Le Grange <terence@sunway.edu.my>
wrote:

> Dear All,
>
> I have installed Moodle version 1.8 and am facing problems whereby the
> server resources are bring consumed within seconds. Each page request
> through http is consuming between 20 and 35 MB RAM. The server works well
> for loads of approximately 20 users but at 25 or 30 it just crashes and I
> need to restart the httpd process. Current setup is Fedora Core 5 (Apache
> 2.2.0) with 512 MB of memory.
>
> Looking at TOP, I see that apache is not recycling it's memory (each
> process
> takes up between 1 and 6% and even though it's been idle for some time it
> does not seem to recycle it. Memory then stays at about 500MB until such
> time as I restart the service and it drops to 230MB (I currently restart
> the
> service hourly which very often fails). A snapshot of my process list is
> as
> follows:
>
> top - 15:46:56 up  4:15,  2 users,  load average: 0.00, 0.03, 0.02
> Tasks:  91 total,   1 running,  90 sleeping,   0 stopped,   0 zombie
> Cpu(s):  0.2% us,  0.0% sy,  0.0% ni, 99.8% id,  0.0% wa,  0.0% hi,  0.0%
> si
> Mem:    504156k total,   474812k used,    29344k free,    28988k buffers
> Swap:  1534196k total,        0k used,  1534196k free,    92952k cached
>
>  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
>
>  4991 apache    16   0 43292  20m 4436 S    0  4.1   0:01.37 httpd
>
>  4992 apache    15   0 52168  29m 4520 S    0  5.9   0:02.11 httpd
>
>  4993 apache    15   0 43148  20m 4320 S    0  4.1   0:01.25 httpd
>
>  4994 apache    15   0 43140  20m 4396 S    0  4.1   0:01.82 httpd
>
>  4995 apache    16   0 43484  21m 5388 S    0  4.3   0:01.66 httpd
>
>  4996 apache    17   0 48540  26m 5428 S    0  5.4   0:02.57 httpd
>
>  4997 apache    15   0 47844  24m 4376 S    0  5.0   0:02.31 httpd
>
>  4998 apache    15   0 43260  20m 4360 S    0  4.1   0:01.70 httpd
>
>  4999 apache    15   0 60444  37m 4496 S    0  7.5   0:02.38 httpd
>
>  5000 apache    15   0 60624  37m 4560 S    0  7.6   0:09.21 httpd
>
>  5001 apache    16   0 50868  27m 4412 S    0  5.6   0:06.82 httpd
>
>  5002 apache    15   0 43148  20m 4380 S    0  4.1   0:01.89 httpd
>
>  5003 apache    16   0 50868  27m 4412 S    0  5.6   0:01.58 httpd
>
>  5004 apache    15   0 43284  20m 4368 S    0  4.1   0:00.55 httpd
>
>  5005 apache    16   0 50980  27m 4412 S    0  5.6   0:02.21 httpd
>
>  5112 apache    15   0 43248  19m 4148 S    0  4.0   0:00.47 httpd
>
>
> I have been tweaking around with the conf file and this is what I
> currently
> have:
>
> KeepAlive On
>
> #
> # MaxKeepAliveRequests: The maximum number of requests to allow
> # during a persistent connection. Set to 0 to allow an unlimited amount.
> # We recommend you leave this number high, for maximum performance.
> #
> MaxKeepAliveRequests 100
>
> #
> # KeepAliveTimeout: Number of seconds to wait for the next request from
> the
> # same client on the same connection.
> #
> KeepAliveTimeout 5
>
> ##
> ## Server-Pool Size Regulation (MPM specific)
> ##
>
> # 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
> # ServerLimit: maximum value for MaxClients for the lifetime of the server
> # MaxClients: maximum number of server processes allowed to start
> # MaxRequestsPerChild: maximum number of requests a server process serves
> <IfModule prefork.c>
> StartServers       15
> MinSpareServers    10
> MaxSpareServers   20
> ServerLimit      512
> MaxClients       512
> MaxRequestsPerChild  4000
> </IfModule>
>
> # worker MPM
> # StartServers: initial number of server processes to start
> # MaxClients: maximum number of simultaneous client connections
> # MinSpareThreads: minimum number of worker threads which are kept spare
> # MaxSpareThreads: maximum number of worker threads which are kept spare
> # ThreadsPerChild: constant number of worker threads in each server
> process
> # MaxRequestsPerChild: maximum number of requests a server process serves
> <IfModule worker.c>
> StartServers        10
> MaxClients         256
> MinSpareThreads     25
> MaxSpareThreads     75
> ThreadsPerChild     75
> MaxRequestsPerChild  4000
> </IfModule>
>
>
> I have read the Moodle docs on Apache performance, googled and read the
> Apache website for the past week without siginificant improvements when
> changing these variables. I also am aware of the significant resources
> that
> Moodle consumes, but would hope that it could at least support 30 users.
>
> I have tried doubling max open files to 100k. (/proc/sys/fs/file-max)
>
>
> If someone could assist in pointing me in any direction I would greatly
> appreciate it.
>
>
> Kind Regards,
>
> Terence
>
>
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