performance scalability of a multi-core
phk at phk.freebsd.dk
Wed Sep 9 18:30:28 CEST 2009
In message <4AA7AD33.1060801 at 1art.cz>, =?UTF-8?B?VsOhY2xhdiBCw61sZWs=?= writes:
>what are your experiences using varnish on multi CPU systems on
>my experience in Linux on 8core is that varnish never gets more than
>20% of all CPUs, only vhen it is overloaded, then it takes all CPU ( but
That is pretty typical behaviour.
In general Varnish does not need much CPU, it needs only an average
of seven sytem calls for a cache hit (last I looked).
The problem is that when things pile up, for whatever reason, Varnish
sort of climbs the pile.
Various ideas have been floated, how to deal better with that, but
no really good idea has been found yet.
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