[Pvfs2-users] Re: Performance of varstrip_dist configures as a
stripe verses simple_stripe
carns at mcs.anl.gov
Mon Oct 27 12:10:58 EST 2008
Tony Kew wrote:
> Dear Phil,
> Phil Carns wrote:
>> Tony Kew wrote:
>>> The test dir was set up with 16K strips on each node for a 1024K stripe.
>>> iozone set up to write in 1024K blocks. The job took about an hour and
>>> five minutes to run...
>>> Initial write 668,321.05 KB/sec
>>> Rewrite 677,999.64 KB/sec
>>> Read 300,937.30 KB/sec
>>> Re-read 313,756.56 KB/sec
>> You realize that you can create this same setup with the default
>> simple stripe distribution too if you use a 16K strip size, right?
> Yes, I just wanted a test I could then compare with the results of similar
> distributions using the simple_stripe and twod_stripe distributions.
> In my tests so far varstrip_dist set up to be the same as a simple_stripe
> is slower, markedly slower when the filesystem is on the same nodes
> as iozone is running on (i.e. an "on the fly" filesystem built across
> the nodes in a PBS job) - I don't know if this is what you might reasonably
Thanks for sharing that data- that's really interesting. It looks like
something in the varstrip distribution must be adding quite a bit of
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