On 10/17/07, Andrew Miehs <andrew@xxxxxxxxx> wrote: > > 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 > 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
