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
expect
from
http://www.ccr.buffalo.edu/display/WEB/PVFS+version+2+scratch+filesystem+on+U2+-+Test+Results
Hi Tony,
Thanks for sharing that data- that's really interesting. It looks like
something in the varstrip distribution must be adding quite a bit of
computational complexity.
-Phil
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