On Wed, Dec 02, 2009 at 03:53:46AM -0800, frank wrote: > Hi, > 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 GFS2? 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 cluster.conf file). The numbers you provide I'd expect to see on a local filesystem. Ray -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster
