RE: [squid-users] Questions on cache and memory

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@gmail.com]
Sent: Thursday, April 06, 2006 3:24 PM
To: Zabrina Mohamad
Cc: Squid-Users (E-mail)
Subject: Re: [squid-users] 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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Received on Thu Apr 06 2006 - 01:54:41 MDT