[Mediawiki-l] How to tell if memcached is working

Tim Starling tstarling at wikimedia.org
Thu Aug 23 11:33:42 UTC 2007


Seth Brundle wrote:
> I seem to have everything working perfectly for memcached, but I dont
> see any difference in benchmarking a default pageview ie:
> 
> ab -n 100 http://192.168.0.40/mediawiki/index.php/Main_Page
> 
> shows the same result (about 7 requests per second) whether memcached
> is running or not.
> 
> Is this not an appropriate test to see if memcached is working, or is
> memcached simply not observable with a local unloaded mysql server?
> 
> When I run squid, requests jump into the 4000+ RPS range.
> 
> Details: FreeBSD 6.2, apache 1.3, php 5, mysql 5 (local),
> memcached-1.2.2, PECL/memcache-2.1.2, mediawiki-1.10.1

The difference would only be a few milliseconds at best, for a parser 
cache hit. Are you using a bytecode cache like APC? Are you running over 
NFS? Those are the most important things to get right.

-- Tim Starling




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