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Re: [Linux-cluster] GFS performance test



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


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