Re: [SQU] squid Pbs when high load, async-io, SMP under linux

On Sun, 3 Dec 2000, Fabien Salvi wrote:

> Hello,
>
> I have some problems with squid when load become important (60-80 req/s).
> Material :
>
> PII-450 Mhz Bi-pro
> 512 MB RAM
> 9GB HD SCSI (RAID1 hardware with external controller)
> NIC 3com 905b
> Debian GNU/Linux 2.2 (with glibc 2.1.3)
>
>
> Squid :
> squid 2.3.4 with squidGuard redirector (15 redirectors started)
> Mem config in squid to 128
> Cache_dir to 3200 MB
> Reiserfs filesystem (r5 hash)
>
> 3.6 millions of request per week
> 40 proxy servers (low load, behind isdn link) that use this one as peer (not all at the same time)
>
> Configure command :
>
>
> So, when I have high load, squid doesn't respond to request on its port 3128.
> If I do a "squid -k reconfigure", it will work for 2-3 minutes and it still hang up...
> There is warning and nothing specail in log files.
> When I put logging to ALL,2 I see a lot (10 times/s) of "resource temporary unavailable".
> But, I don't think it's significative, because the problem still exist even with low charge when squid perform correcty.
>
> I don't increase logging, because log files are very big in a few minutes and there is too much informations to analyse !
>
> So, I have some questions :
>
> 1) Is the problem only relative to high load ?
>
> 2) Should I disactivate async-io ? Or maybe I can increase the numthreads (16 by defaults, can I put it to 32 or 64 ?)
> Is the number of threads have importance with load ?
>
> 3) Squid and SMP
> I think squid is not (maybe I am wrong ?) using the SMP.
> Can I imagine running 2 squid on 2 differents port for reducing the charge for each one ?
> I imagine I have to put differents cache_dir and log_dir, so I will lose some caching efficiency, but it doesn't matter in my case :
> proxy is mainly used for security and because all clients use a private network addressing...
> Do Someone already run 2 squid on the same server ?
>
> 4) Do you think I shoud use 2 servers because the load is too important ?
> I hope no :)

I think your problem is that you have just one hard drive.

60-80 req/sec on one hard drive is quite good.

To get better performance you should add another hard drive, and
never use RAID.

Duane W.

--
To unsubscribe, see http://www.squid-cache.org/mailing-lists.html