Paul Cocker wrote:
-----Original Message-----
From: Amos Jeffries [mailto:squid3@xxxxxxxxxxxxx]
Sent: 21 January 2009 23:42
To: Chris Robertson
Cc: squid-users@xxxxxxxxxxxxxxx
Subject: Re: cache_mem
Paul Cocker wrote:
Simple one I hope
Once you have squid up and running and know its memory use and
overall system memory use, should cache_mem be set as a
percentage of
the free memory available, or should you be leaving a
large amount of
memory for the use of the OS file cache and keeping squid'
cache_mem
at a smaller value like 64MB?
1) Squid's handling of large objects (1MB+) in memory can be CPU
intensive.
2) Squid does not pull objects from the disk cache into the
memory cache.
Given those two facts, I use a smaller cache_mem value (64
or 128 MB)
and leave the rest for the OS.
(1) is only relevant to squid-2. Squid-3 handles large file
in-memory a lot better. But (2) still occurs in both, so it's
only partial improvement on initial handling.
Amos
How intensive is intensive? At the moment squid is averaging a mere 2.4%
processor time.
IIRC older Squid-2 had to step a linked-list the length of the object in
4KB chunks to perform one of the basic operations (network write I think).
Amos
--
Please be using
Current Stable Squid 2.7.STABLE5 or 3.0.STABLE12
Current Beta Squid 3.1.0.3
