[Lustre-discuss] Fwd: Lustre performance issue (obdfilter_survey
lior amar
liororama at gmail.com
Wed Jul 6 22:12:52 PDT 2011
Hi,
First, thanks for your quick replay.
On Wed, Jul 6, 2011 at 11:37 PM, Cliff White <cliffw at whamcloud.com> wrote:
> The case=network part of obdfilter_survey has really been replaced by
> lnet_selftest.
> I don't think it's been maintained in awhile.
>
> It would be best to repeat the network-only test with lnet_selftest, this
> is likely an issue with
> the script.
> cliffw
>
>
I used the lnet self test and got reasonable results
------------------
Numbers obtained with concurrency = 1
[LNet Rates of servers]
[R] Avg: 3556 RPC/s Min: 3556 RPC/s Max: 3556 RPC/s
[W] Avg: 4742 RPC/s Min: 4742 RPC/s Max: 4742 RPC/s
[LNet Bandwidth of servers]
[R] Avg: 1185.72 MB/s Min: 1185.72 MB/s Max: 1185.72 MB/s
[W] Avg: 1185.72 MB/s Min: 1185.72 MB/s Max: 1185.72 MB/s
-------------------
The question is what is the meaning of the concurrency=1 flag. Does it mean
a single thread at the client
or a sigle thread per core??
My problem is with the case=netdisk that gives me low performance for single
thread (the dd case).
(as well as with the ost_survey case).
Is the case=netdisk a valid test ??
I am trying to isolate the problem and the case=netdisk alows me to avoid
accessing the mds (right?)
Any Idea??
----------------------oo--o(:-:)o--oo----------------
Lior Amar, Ph.D.
Cluster Logic Ltd --> The Art of HPC
www.clusterlogic.net
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