Re: [squid-users] Squid on DualxQuad Core 8GB Rams - Optimization - Performance - Large Scale - IP Spoofing

On 10/17/07, Andrew Miehs <andrew@2sheds.de> wrote:
>
> On 17/10/2007, at 10:50 AM, Muhammad Tayseer Alquoatli wrote:
>
> > On 10/17/07, Andrew Miehs <andrew@2sheds.de> wrote:
> >> On 17/10/2007, at 10:03 AM, Muhammad Tayseer Alquoatli wrote:
> >>> what about AUFS, is in it a way to utilize the other cpus ? i'm
> >>> running an SMP machine with aufs and when i issue mpstat -P ALL i
> >>> see that all cpus are used (not equally but nearly equally) and
> >>> there is no other application running on the box but squid?
> >>
> >>
> >> Let me guess - if you add the usage on all your CPUs together you do
> >> not go over, or not far over '1' ?
> >>
> >
> > Hi Andrew
> >
> > yes, probably, i don't remember i've got more than 1, but the overall
> > load is little (0.25-0.3), do you have an explanation ?
> > Thanks
>
> If I understand aufs correctly, it is that squid uses threads rather
> than
> a queue to store the 'to be written requests'.
>
> "aufs" uses the same storage format as "ufs", utilizing
> POSIX-threads to avoid blocking the main Squid process on
> disk-I/O. This was formerly known in Squid as async-io.
>
> If you only have '1' set of disks you will probably find that this will
> not give you any improvement.
>
> Looking at your load I assume you have 4 processors (probably 2x Dual
> Core)
> or 2x Hyperthreading CPUs - correct?
>
> The best way that I know of you increase your squid performance is
> add more
> disks. I haven't tested it (as my squids run RAM (16g) only) - but
> you will probably be better off with 4 separate filesystems on 4 disks,
> rather than one raid 10 on the same for disks -
> ie: (The sizing and filesystem is just copied from example from the web)
>
> cache_dir ufs /cache/disk1 200 16 256
> cache_dir ufs /cache/disk2 200 16 256
> cache_dir ufs /cache/disk3 200 16 256
> cache_dir ufs /cache/disk4 200 16 256
>

Thanks Andrew

I'm using 300GB of cache separated over 6 disks cache dirs with AUFS
storage scheme and 2*Dual core Xeon, i think this is the best i can
get out of this box
best regards,

> Cheers
>
> Andrew
>
>
>
>

-- 
Muhammad Tayseer Alquoatli