Re: OHSM benchmarking [Was Re: Copying Data Blocks]

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2009/1/25 Greg Freemyer <greg.freemyer@xxxxxxxxx>:

> Then first do a dd test to see how fast it works from pure userspace.  ie.
>
> dd if=/dev/zero of=<testfile> bs=1m count=2000    // build a 2 GB test file
>
> time (dd if=<testfile-on-tier1> of=<testfile-on-tier2> bs=1m; sync)
>
> repeat at least a couple times to verify the times.
>

Remember to run
echo 3 > /proc/sys/vm/drop_caches
just before each benchmark

Regards
Martin

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