[Lustre-discuss] read performance on ia64

[Andreas Dilger]

On Mar 04, 2009  14:53 -0500, Michel Dionne wrote:
> I am running test between an X4150 and SGI Altix with luster 1.6.6 and I
> can see a read performance drop on the SGI.

How many cores on the SGI system?

> Numbers:
> X4150
> dd if=/dev/zero of=/mnt/exec4_client_ib/mike/4/bigfile bs=4096k
> count=10000 (336MB/s) this a folder with a stripe of 4 for all tests
> dd if=/mnt/exec4_client_ib/mike/4/bigfile of=/dev/null bs=4096k
> (461MB/s)
> 
> SGI Altix
> dd if=/dev/zero of=/mnt/exec4_client_ib/mike/4/bigfile bs=4096k
> count=2000 (371MB/s) 99% of the core is running dd
> dd if=/mnt/exec4_client_ib/mike/4/bigfile of=/dev/null bs=4096k
> (142MB/s) 20% is running dd and 80% is running ptlrpcd
> 
> 
> The X4140 is running:
> 2.6.18-92.1.10.el5_lustre.1.6.6smp #1 SMP Tue Aug 26 12:16:17 EDT 2008
> x86_64 x86_64 x86_64 GNU/Linux
> Red Hat Enterprise Linux Server release 5.2 (Tikanga)
> 
> The SGI is running:
> SGI Altix systems 2.6.16.46-0.12-default #1 SMP Thu May 17 14:00:09 UTC 
> 2007	4 ia64 ia64 GNU/Linux

Please try running the v1_8_0_RC2 from CVS - it has patches that should
improve the scalability of the client when there are many CPUs.

Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.