On Oct 30, 7:51 pm, web-junkie <[EMAIL PROTECTED]> wrote:
> Hi,
> I have a weird problem where I think memcached or caching in general
> might be the cause. I discovered it during testing the site with
> http_load. After a certain amount of fetches, or hits, to the server,
> the site does not respond normally. It takes 30 seconds or so. Strange
> thing is: Only for cached pages. Non cached pages still load fast
> afterwards.
> When I do the test on a not cached page it is normal, too. No
> problems. But on cached page it seems the site is somehow off track.
> Only fix is to do apache reload.
> The problem is not only with http_test, but after some hours of
> traffic, too! Seems like the cache thinks "That's enough for today",
> until you reload apache.
> Strange problem, maybe I did something wrong somewhere. Any ideas?
> Help would be appreciated. Thanks.
Are you using Apache prefork MPM or worker MPM? If worker, how many
threads in each process? Also, what do you have for maximum number of
child processes in Apache configuration. Finally, how many Django
instances are you hosting?
There were a few comments recently about issues with using memcached
in worker MPM due to each thread creating a connection to memcached
servers. If this turns out to be the case, could be possible to
exhaust maximum number of connections that memcached servers will
accept. Still need to look into this to work out what is reality, but
your feedback on your setup might help in that.
BTW, does everyone use the pure Python memcached client module, ie.,
memcache. Have seen comments to the effect that C client is three
times faster, although if you then want object marshaling on top of
that it would slow down a bit.
Graham
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