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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