#5513: Last session refactoring vastly down Django performance
-----------------------+----------------------------------------------------
Reporter: msaelices | Owner: msaelices
Status: new | Component: Contrib apps
Version: SVN | Keywords: slowness
Stage: Unreviewed | Has_patch: 0
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Changes made in [6333] are wonderful because allow Django to store session
information not only in database, rather in file system or memcached.
But the problem is Django is now too much slower (I'll have to investigate
why). These are my experiments in my web site, that is more than a simple
poll application:
{{{
~$ cd django_src
~$ svn up -r6332
[...]
~$ ab2 -n 200 http://localhost:8000/
[...]
Document Path: /
Document Length: 8598 bytes
[...]
Total transferred: 966800 bytes
HTML transferred: 928600 bytes
Requests per second: 33.75 [#/sec] (mean)
Time per request: 29.631 [ms] (mean)
Time per request: 29.631 [ms] (mean, across all concurrent
requests)
Transfer rate: 159.29 [Kbytes/sec] received
[...]
~$ svn up -r6333
[...]
~$ ab2 -n 200 http://localhost:8000/
[...]
Document Path: /
Document Length: 8598 bytes
[...]
Total transferred: 966800 bytes
HTML transferred: 928600 bytes
Requests per second: 22.18 [#/sec] (mean)
Time per request: 45.086 [ms] (mean)
Time per request: 45.086 [ms] (mean, across all concurrent
requests)
Transfer rate: 104.69 [Kbytes/sec] received
}}}
My sessions is stored on postgresql. It downs from '''33.75rps''' to
'''22.18'''. It's a great performance penalty.
Other experiments: with {{{file}}} session backends speed ups Django to
'''32.50''' rps (like old database session machinery) and with memcached
({{{cache}}} backend) it ups to {{{33.15rps}}}, more or less like file
backend also.
I think is a must to do a tunning and profiling here.
--
Ticket URL: <http://code.djangoproject.com/ticket/5513>
Django Code <http://code.djangoproject.com/>
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