On Jul 22, 2009, at 3:14 PM, Kyle Schochenmaier wrote:
In general, what I do is to tweak the FlowBufferSize paramater in the
filesystem config file. It is defaulted to 64KB, which will be the
max size of any transfer (packet) over the wire in PVFS. You'll want
to tune this for your workload and network - Setting it too high can
hurt smaller accesses, too low (imo: default) tends to hurt large
transfers. In my experience : Setting it to 1MB is usually
sufficiently large to make the physical network become the bottleneck.
You might also increase the strip_size in the filesystem configuration
file. I generally add something like
<Distribution>
Name simple_stripe
Param strip_size
Value 4194304
</Distribution>
Which makes each strip of the file 4 MB instead of the default 64 KB.
~Milo
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