On Tue, 25 May 2010 14:28:41 +0200, Poul-Henning Kamp <[email protected]>
wrote:
I may have "misunderestimated" the dynamics of how objects live in
Varnish caches and thus taken a wrong optimization decision with
the critbit hasher.
I am looking for data to figure this out, specifically the values of
the two varnishstat counters:
"N struct objecthead."
and
"N struct object"
Along with information about which version of varnish, and which, if
any -h argument you use.
I don't have any critbit info, since we're running on 2.0.4,
ii libvarnish1 2.0.4-5~bpo50+1 shared libraries for Varnish
ii varnish 2.0.4-5~bpo50+1 a state-of-the-art, high-performance
HTTP accelerator
Here's the counters from one installation, hash default settings
serving ~100 req/s of very small objects, 2 twin machines,
n_object 100585 . N struct object
n_objecthead 103700 . N struct objecthead
n_object 102270 . N struct object
n_objecthead 102294 . N struct objecthead
Maybe I should use -h with a higher number? :)
This other here is a different installation, ~500-1000 req/s
of medium/big files/pics and longer ttl (10 days default),
again 2 twin machines,
n_object 303979 . N struct object
n_objecthead 299199 . N struct objecthead
n_object 506522 . N struct object
n_objecthead 504143 . N struct objecthead
Here I'm using '-h classic,500009'
--
Cosimo
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