On 13 September 2012 17:44, <hol...@th.physik.uni-frankfurt.de> wrote: > >> Ok. Let me be clear, 10M as a file size is not useful as a test. The >> numbers are, for lack of any better way to describe this, meaningless. > > I am specifically testing the performance of NFSoRDMA vs NFSoTCP. I do not > want my load to go to disk. > > What Im really curious about is why each process is limited to 7k or so IOPS.
I am not an iozone expert, but It could be that iozone is doing synchronous IO (i.e. each write has to be acknowledged by the NFS server). This would explain why the per-process IOPS is limited but increasing the number of processes increases the total number of IOPS. Try mounting the NFS export with the "async" option, and/or use the async option for iozone to see if you get higher numbers. Cheers -- Jonathan Barber <jonathan.bar...@gmail.com> _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org sponsored by Penguin Computing To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
