squid will not use disk space more than the one you have specify in the
configuration files (see the cache_dir parameter). as how much space you
need for cache, it really depends on your users behavior.. in my case,
i only need around as much as the data being downloaded from the internet
in a day. this because most of the sites being access are non-cacheable.
so give your squid a try and see how much space you need.
squid will automaticaly 'rotate' the content according to the algorithm you
have chosen in the squid configuration file (see the cache_replacement_policy
parameter).
squid does take a lot of memory.. in short you could read
http://www.squid-cache.org/Doc/FAQ/FAQ-8.html#ss8.11
i suggest you should read the squid configuration sample file. it has a lot
information in need.
Quoting Zabrina Mohamad <Zabrina@xxxxxxxxxxxxx>:
Thanks Mark,
Just for your info, my server is having 2GB memory and we have about
550users. At the moment I have not migrate them yet, that's why I
need to understand further on squid behaviour prior moving them in
to ensure no performance issue or major problem.
I have configured my cache_mem to 1GB, is that enough for the number
of users? can you recommend for the appropriate value..
I would appreciate if you eleborate further when you say it will be
taken care automatically..does that mean that I have to configure
anywhere?
What worry me is when it start to purge/clear cache, will it affect
the performance i.e slow surfing..
another thing is I realize the free memory have been gradually
decrease. I don't know what is eating up the memory and when is it
going to stop.
Below is the snapshot of top command.
top - 15:37:17 up 2 days, 7:43, 2 users, load average: 0.00, 0.00, 0.00
Tasks: 85 total, 1 running, 84 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.1% us, 0.0% sy, 0.0% ni, 99.7% id, 0.2% wa, 0.0% hi, 0.0% si
Mem: 2075032k total, 969188k used, 1105844k free, 311224k buffers
Swap: 4096564k total, 0k used, 4096564k free, 479176k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
2779 squid 15 0 56648 52m 1284 S 0.0 2.6 0:28.85 squid
2780 squid 16 0 1508 268 216 S 0.0 0.0 0:00.07 unlinkd
#####################################################################
Uptime Squid status % used Total In Used(kb) Total Free(kb)
3 hours up 0.5 262684 1812348
1 day up 0.9 633324 1441708
1 day up 1.1 682812 1392220
1 day up 2.1 884804 1190228
2 days up 2.1 902724 1172308
2 days up 2.5 958428 1116604
-----Original Message-----
From: Mark Elsen [mailto:mark.elsen@xxxxxxxxx]
Sent: Thursday, April 06, 2006 3:24 PM
To: Zabrina Mohamad
Cc: Squid-Users (E-mail)
Subject: Re: Questions on cache and memory
Hi,
I am newbie to squid. Recently, we have installed squid with two
cache dir of 25GB.
A few questions:
1. Is there some sort of parameters to set for objects in the cache
to expire so that they get overwritten by recent objects and also to
ensure the disk will not be 100% full?
- Squid takes care of this automatically; taking into account, the size
specified of the intended cache dir(s).
2.How I can purge the cache, automatically i.e when the cache
reaches 80%, . Netscape Suitesopt has that features.
- Leave this unattended, see previous reply on item 1)
3. How does and what does it means when I set my disk to LRU . Does
it mean that both cache dirs will be actively used ?
- Don't think this parameter is available in recent SQUID versions.
4. How to limit concurrent users?
5. Can we limit the usage of memory for SQUID?
- Squid's mem usage is basically determined by the size of the
cache dir(s); see FAQ.
And setting of 'cache_mem' ; see desc. of this parameter in
squid.conf.default.
M.
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