On 17/10/2007, at 10:50 AM, Muhammad Tayseer Alquoatli wrote:
On 10/17/07, Andrew Miehs <andrew@xxxxxxxxx> 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
Cheers
Andrew
