[Pvfs2-developers] pvfs2-cp performance with single client and single server

[Pete Wyckoff]

atchley at myri.com wrote on Fri, 05 Jan 2007 11:59 -0500:
> >% mpiexec -n 1  ./perf -fname pvfs2:/mnt/pvfs2/x1
> >Access size per process = 134217728 bytes, ntimes = 10
> >Write bandwidth without file sync = 827.824860 Mbytes/sec
> >Read bandwidth without prior file sync = 870.979531 Mbytes/sec
> >Write bandwidth including file sync = 827.166730 Mbytes/sec
> >Read bandwidth after file sync = 865.624838 Mbytes/sec
> >
> >using a single client. The client used about 25% CPU.
> >
> >Scott
> 
> The above was with 1 MB buffers. With 16 MB buffers:
[..]
> The client CPU usage was 25% for both values. I do not see any  
> benefit for larger than 1 MB buffers.

Great!  Using the MPI interface gives you good numbers, then.

I think my perf has been hacked up by a few people, but there's no
need to run it specifically.

		-- Pete