Hello Jean-Francois,
we have seen similar behavior. You did not specify what platform you use
so I assume Linux. After some studying and experimentation my
recommendation is:
a) always make sure varnish uses only memory, never disc, if you expect
good performance. So specify the cache size smaller than the available
memory you have (some memory should be reserved for other processes and
some varnish control structures, we use 14G cache size on 16G box)
b) use malloc storage type
Hope this helps,
Michal
Dne 21.4.2011 10:51, Jean-Francois Laurens napsal(a):
Hi there,
We're run varnish 2.1.5 for some week now and we still do not
understand some behavior regarding the shared memory activity.
We specified a --sfile,/var/lib/varnish/varnish_storage.bin,50G in the
configuration but it's impossible to go higher than 25G used by
varnish. Please see the following cacti graph:
In addition I can see varnish doesn't seem to be able to handle more
than 1 million objects:
When the child process get killed, the load of the system was very high:
Apr 20 21:46:44 server-01-39 varnishd[21087]: Child (5372) not
responding to CLI, killing it.
....
Apr 20 21:49:57 server-01-39 nrpe[18101]: Command completed with
return code 2 and output: CRITICAL -*load average: 159.00, 159.32,
77.02*|load1=159.000;15.000;30.000;0; load5=159.320;10.000;25.000;0;
load15=77.020;5.000;20.000;0;
....
Apr 20 21:48:43 server-01-39 varnishd[21087]: Child (5372) not
responding to CLI, killing it.
All this makes me believe we have an issue with some kernel parameters
that do not allow varnish to handle as many objects as we configured it.
Would anybody have an advice for this problem ?
Jef
Jean-Francois Laurens
Ingénieur Syste`me Unix
Resources et Développement
Secteur Backend
*RTS - Radio Télévision Suisse
*Quai Ernest-Ansermet 20
Case postale 234
CH - 1211 Gene`ve 8
T +41 (0)58 236 81 63
--
Michal Táborský
chief systems architect
Netretail Holding, B.V.
http://www.nrholding.com
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