Re: [squid-users] Howto Clear Cache Periodicaly

HI,
Based on the below, how does it actually removed the
old data when the cache hit the low_swap value. WIll
it remove only selected old data in the cache (can we
monitor this) and is there any impact to the users i.e
slow performance?

Sorry, I' also a newbie in SQUID and reading from the
FAQ make me more confused. Really need more
experienced person to explain it.

Thank you so much..

*************************************

> I have a squid that has been caching for like 10
month. It now have an
> amazing size of 4.5 gig. When browsing on the web,
it is now very very
> slow. I restarted squid with a clean cache.
Everything was fine again.

This is usually a tell-sign that you have run out o
memory. There is a
couple of other conditions which could cause this as
well, but excessive
memory usage is by far the most common. As already
indicated the FAQ has
good guidance about how much memory Squid uses, in
fact a whole chapter
about this subject alone.. it is a often misunderstood
aspect of Squid.

Some of the other common causes to significant
slowdown when cache is
populated is

  - Request load on the borderline of what the
harddrive(s) can handle.
A full cache requires more I/O than an empty cache as
removing content
from the cache also costs I/O..

  - slocate updatedb or other cronjobs trying to index
the cache files
in vein..

Collecting system statistics with sar or similar tools
is a good step to
have the required information available to be able to
analyze why a
system has become slow.

It is also worth noting that it isn't uncommon that a
freshly restarted
Squid runs faster for a while (several minutes) as it
takes some time
before the client request load is back. By restarting
Squid you
terminate all currently pending requests, often
including large long
running downloads..

Regards
Henrik

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Received on Tue Apr 11 2006 - 21:59:27 MDT