Re: [squid-users] Memory Considerations when you are running multiple instances of squid on the same server.

From: Henrik Nordström <>
Date: Fri, 21 May 2010 09:53:06 +0200

fre 2010-05-21 klockan 06:38 +0000 skrev GIGO .:

> can it be said as a generalization that one can allocate/fix 1/4 of
> physical ram for cache mem objects. Will it holds true even when you
> are running multiple instances???

I would not generalize a rule like that. It is a reasonable
recommendation when sizing the system, but also depends on how your
Squid is being used. A reverse proxy benefits much more from cache_mem
than a normal forward proxy, and in a forward proxy you may want to give
priority to on-disk cache instead.

memory usage per Squid = cache size (in GB) * 10 MB + cache_mem + 10MB.

memory usage by OS: Leave at least 25%. In smaller configurations up to

system memory requirement = sum(squid instances) + system memory =
sum(squid instances) / 0.75.

If you inverse the above calculation then you'll notice that cache size
is a function of cache_mem. If one is increased then the other need to
be decreased.

Note: if you also log in on the sever using graphical desktop (not
recommended) then reserve about 1GB for that.

> please guide that how memory handling will be occuring in multiple
> instances setup???cache_mem will influencing per instance and not the
> program as whole. right?


Received on Fri May 21 2010 - 07:53:09 MDT

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