Hi,
I'm benchmarking a 12-node PVFS installation right now using an MPI program that generates various strided patterns supposed to stress the file system in different ways and to trigger the collective buffering in Mpich. I'm using 576 processes for that (24 24-core nodes). I was expecting the collective buffering to perform better than having each process issue an independent strided write, but it seems that disabling collective buffering leads to better performance. I'd be curious how PVFS2 optimizes its independent strided operations to have such good performance? Thanks, Matthieu Dorier PhD student at ENS Cachan Brittany and IRISA http://people.irisa.fr/Matthieu.Dorier
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