[Linux-cluster] GFS performance test
Ray Van Dolson
rvandolson at esri.com
Wed Dec 2 14:58:43 UTC 2009
On Wed, Dec 02, 2009 at 03:53:46AM -0800, frank wrote:
> after seeing some posts related to GFS performance, we have decided to
> test our two-node GFS filesystem with ping_pong program.
> We are worried about the results.
> Running the program in only one node, without parameters, we get between
> 800000 locks/sec and 900000 locks/sec
> Running the program in both nodes over the same file on the shared
> filesystem, the lock rate did not drop and it is the same in both nodes!
> What does this mean? Is there any problem with locks ?
> Just for you info, GFS filesystem is /mnt/gfs and what I run in both
> nodes is:
> ./ping_pong /mnt/gfs/tmp/test.dat 3
> Thanks for your help.
Wow, that doesn't sound right at all (or at least not consistent with
results I've gotten :)
Can you provide details of your setup, and perhaps your cluster.conf
file? Have you done any other GFS tuning? Are we talking GFS1 or
I get in the 3000-5000 locks/sec range with my GFS2 filesystem (using
nodiratime,noatime and reducing the lock limit to 0 from 100 in my
The numbers you provide I'd expect to see on a local filesystem.
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