Fwd: [ofa-general] Performance evaluation of Opensm

[Devesh Sharma]

Thanks Yevgeny, for your valuable input. This will surly help for my work.

On Tue, Jul 7, 2009 at 2:59 PM, Yevgeny
Kliteynik<kliteyn at dev.mellanox.co.il> wrote:
> Hi Davesh,
>
> It's kind of hard to talk about "performance of OpenSM".
> Subnet Manager has different phases and modes of operation,
> each of them is completely separate issue:
>
> - Fabric discovery
> - Fabric ports/nodes configuration
> - Unicast routing calculation
> - Unicast routing configuration on fabric switches
> - Multicast routing calculation
> - Multicast routing configuration on fabric switches
> - SA queries processing
> - Memory consumption
> - Different routing algorithms consume different time and memory
> - QoS
> - etc, etc, etc
>
> Most of the above can be measured only on real cluster.
But how these can be measured is there any compile time flag available
in the Code?
> Some (such as routing calculation and memory consumption) can
> be measured while OSM is running on top of the simulator.
Simulation results are far far away from real situation..:( I am
interested in results with the real fabric.
> Some are very affected by the number of CPU cores that you
> have on the management node (e.g. SA queries processing),
> others mostly affected by the CPU frequency (unicast routing).
> Also, various OpenSM options can affect these phases, such as
> unicast routing cache may reduce routing calculation time to 0.
Hmm........correct.
>
> Sorry that I'm not really answering your question :(
> I just want to point out the fact that there are many aspects
> that should be considered when talking about OpenSM performance.
Do we have any such tool with does profiling of all these phases of
SM. Such tool will be
helpful for the researcher working on different algorithms related to SM.
>
> If what you're interested in is just "system-wide" numbers,
> then you'll probably want to know how much time it takes for
> the OpenSM to bring up cluster from scratch, or how much time
> it takes to reconfigure the fabric after some change.
Will it be fine if I run OpenSM with "time" command and press Ctrl-C
moment I see
SUBNET UP msg. Of-course keeping some of the options and
configurations as constant?

# time opensm -<some options>
SUBNET UP Ctrl-C

> I think that these numbers can come only from the guys that
> administer IB clusters, and they would be highly dependent
> on the management node CPU.
>
> -- Yevgeny
>
> dhananjay tembe wrote:
>>
>> Hi Devesh,
>>
>>       OFED installer comes with a tool called as "osmtest" which is a test
>> program for opensm and for subnet administrator that comes within the opensm
>> itself. The command is /usr/sbin/osmtest.
>>
>>       Another way to test it might be to try it in a large fabric. If you
>> do not have a large fabric, try using the simulator that comes with ofed.
>> The command for the simulator is /usr/bin/ibsim
>> I have not used the simulator yet. So I do not know much about it.
>>
>> Thanks and regards,
>> ---Dhananjay.
>>
>>
>> --- On Tue, 7/7/09, Devesh Sharma <devesh28 at gmail.com> wrote:
>>
>>> From: Devesh Sharma <devesh28 at gmail.com>
>>> Subject: Fwd: [ofa-general] Performance evaluation of Opensm
>>> To: general at lists.openfabrics.org
>>> Date: Tuesday, 7 July, 2009, 11:13 AM
>>> On Mon, Jul 6, 2009 at 8:33 PM, Peter
>>> Kjellstrom<cap at nsc.liu.se>
>>> wrote:
>>>>
>>>> On Monday 06 July 2009, Devesh Sharma wrote:
>>>>>
>>>>> Hello list.
>>>>>
>>>>> Is there any tool or method available to get some
>>>
>>> performance numbers
>>>>>
>>>>> related to Opensm? What are the major performance
>>>
>>> parameters of OpenSM
>>>>>
>>>>> which can
>>>>> be used for performance measurement analaysis?
>>>>
>>>> Do you refer to the performance of the fabric as setup
>>>
>>> by OpenSM or the
>>>>
>>>> performance of OpenSM itself?
>>>
>>> Performance of OpenSM itself. There are many tool available
>>> to measure
>>> performance of Fabric.
>>>>
>>>> /Peter
>>>>
>>>>> Thanks in advance
>>>>> regards
>>>>> Devesh Sharma
>>>>
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>
>