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 <[email protected] <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 > > -- You received this message because you are subscribed to the Google Groups "modwsgi" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/modwsgi. For more options, visit https://groups.google.com/d/optout.
