Hi Graham,
I am using apache version 2.2 and mod_wsgi 3.2
On doing htop, I am getting the following:
PID USER PRI NI VIRT RES SHR S CPU% MEM% TIME+ Command
23309 apache 20 0 563M 70828 6632 S 0.0 1.8 0:00.38
(wsgi:main)
23205 apache 20 0 668M 80128 7660 S 0.0 2.0 0:02.39
(wsgi:main)
23204 apache 20 0 563M 70828 6632 S 0.0 1.8 0:02.18
(wsgi:main)
23311 apache 20 0 668M 80128 7660 S 0.0 2.0 0:00.37
(wsgi:main)
23294 apache 20 0 668M 81332 7656 S 0.0 2.1 0:00.39
(wsgi:main)
23206 apache 20 0 668M 81332 7656 S 0.0 2.1 0:02.45
(wsgi:main)
On Saturday, November 8, 2014 11:03:16 PM UTC-5, Graham Dumpleton wrote:
On 09/11/2014, at 6:24 AM, sags sag...@gmail.com javascript: wrote:
Hi Graham,
I am been reading your blogs and posts on mod_wsgi configurations. We
build some programming modules using an open source django based
application originally developed for MOOCs. We modified the application
based on our requirements but we didn't change much underlying frame work
of that open source code.The application is running fine but server some
time crashed due to out of memory issue. At a time around 30 students use
this application in a class. We monitored, using free -m command,
approximately 30 students when using the application at the same time, the
memory consumption approximately goes down by 200-300 MB. But the problem
is once students log out from the sessions, the* memory doesn't seem to
get released*. Due to which the memory consumption goes on increasing
again and again. For the time being we have wrote a script to clear the
cache if memory goes below 500 MB using echo 1 /proc/ .../drop_caches and
it seems to be freeing lot of memory. Is there some permanent solution to
it. We are using red hat VM server for hosting our application. We except
more teachers using this application, which means traffic is going to be
high in future.
FYI: We are using mod_wsgi deamon mode with processes = 2 and Threads = 15
Is it due to the django or could it be due to OS or httpd configuration
issues?
I would appreciate your feedback on it.
How are you monitoring memory usage and what processes are specifically
taking up the memory?
I don't understand how:
echo 1 /proc/sys/vm/drop_caches
as described in:
http://linux-mm.org/Drop_Caches
can affect the run time memory usage of specific Python web application
processes.
BTW, in monitoring memory used by Apache, ensure that if using mod_wsgi
daemon mode that you are using the option:
display-name=%{GROUP}
to the WSGIDaemonProcess directive.
By doing this it will result in the process names as shown by 'ps' and
'htop' being the name of the mod_wsgi daemon process group name. This way
you can distinguish between normal Apache processes and the mod_wsgi daemon
process groups.
For example, for:
WSGIDaemonProcess mysite display-name=%{GROUP} processes=2 threads=15
You will see in 'ps' out:
httpd (or apache2 on some systems) running as root - Apache parent
process
httpd (or apache2 on some systems) running as Apache user - Apache
child worker processes
(wsgi:mysite) - mod_wsgi daemon process group processes
if you are pinning it to an Apache processes, which of these is showing
increase memory usage.
Also, what version of Apache and mod_wsgi are you using?
Graham
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