[Lustre-discuss] Performance parameters
Mark Seger
Mark.Seger at hp.com
Fri Jun 6 08:00:31 PDT 2008
The very first thing I do before indicting lustre is to verify my
interconnect speed as well as storage performance. Once these look
good do I start looking at lustre itself. Even then, I never measure
the performance by just looking at the elapsed time to run a test.
Rather I always run collectl in a separate window and look at my
network/interconnet, cpu, etc every second during the test so see what
is really happening in between the end points.
-mark
Enrico Morelli wrote:
> Dear all,
>
> which are the parameters that I can set to improve the
> lustre performance?
>
> Because I have very worse performance using lustre 1.6.4.3.
> An 'ls' on a directory containing 1000 files gets 30s (on a NFS
> filesystem the same 'ls' gets 0.3s)
>
> The same for a file creation/copy.
> On lustre:
> # time dd if=/dev/zero of=test.txt bs=1k count=1024000
> 1024000+0 records in
> 1024000+0 records out
>
> real 1m39.423s
> user 0m0.510s
> sys 0m10.940s
>
> # time cp test.txt test.out
>
> real 1m2.526s
> user 0m0.000s
> sys 0m3.550s
>
> On NFS:
> # time dd if=/dev/zero of=test.txt bs=1k count=1024000
> 1024000+0 records in
> 1024000+0 records out
>
> real 0m11.920s
> user 0m0.438s
> sys 0m9.864s
>
> # time cp test.txt test.out
>
> real 0m15.012s
> user 0m0.012s
> sys 0m2.444s
>
>
>
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