[openib-general] openMPI for 2.6.17.10 kernel

[Jeff Squyres]

It just clicked in my brain as to why you were asking this question.

Remember that OMPI currently does not use any CM for OF connections  
at all.  So it's not like it's using the old CM that doesn't support  
iWARP.  OMPI uses its own out-of-band mechanism, which, as I  
understand it, should work with iWARP just as well as it works for IB.

Am I incorrect in thinking that?  (I have no iWARP hardware to test  
with)



On Nov 30, 2006, at 11:53 AM, Jeff Squyres wrote:

> None yet.  I took it as an action item from the SC/OFA meeting to  
> add the support.
>
>
> On Nov 30, 2006, at 11:43 AM, Tom Tucker wrote:
>
>> Jeff:
>>
>> Which version of OpenMPI uses the RDMA CMA?
>>
>> Tom
>>
>> On Thu, 2006-11-30 at 06:49 -0500, Jeff Squyres wrote:
>>> I think that this is mainly an OFA question, not so much an Open MPI
>>> question.
>>>
>>> Provided you can get a coherent OFA stack (which others will have to
>>> describe how to do), Open MPI should build against it with no
>>> problem.  Be sure to use the --with-openib=<path to your OFA
>>> installation> option to configure to enable OFA support.
>>>
>>> Note that when using iWARP hardware, you will need to disable small
>>> message RDMA at run-time by setting the MCA parameter
>>> "btl_openib_use_eager_rdma" to 0.  There are a variety of ways to  
>>> set
>>> MCA parameters at run time; see http://www.open-mpi.org/faq/?
>>> category=tuning#setting-mca-params for the details.
>>>
>>> Future releases of Open MPI should do this automatically, but the
>>> current stable series does not (more specifically: we're just  
>>> getting
>>> the iWARP vendors involved in Open MPI, so they're just becoming  
>>> part
>>> of the process, etc.).
>>>
>>>
>>>
>>> On Nov 30, 2006, at 3:41 AM, Tziporet Koren wrote:
>>>
>>>> Chen, Helen Y wrote:
>>>>>
>>>>> Hi,
>>>>>
>>>>> I am running a 2.6.17.10 kernel with Tom Tucker's rnfs patch and
>>>>> would
>>>>> like to build Open MPI that uses either IB or iWARP RDMA  
>>>>> through this
>>>>> kernel. Can I achieve this by getting the latest stable git and
>>>>> compile just the userspace software? If so, how do I go about  
>>>>> getting
>>>>> the latest stable git, and how to compile just the userspace
>>>>> stuff?  I
>>>>> am new at this and would really appreciate your help.
>>>>>
>>>>> Thanks,
>>>>> Helen
>>>>>
>>>>
>>>> OFED 1.1 contains OpenMPI for IB.
>>>> However best if Jeff from OpenMPI will answer it
>>>>
>>>> Tziporet
>>>>
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>>>
>>>
>
>
> -- 
> Jeff Squyres
> Server Virtualization Business Unit
> Cisco Systems
>
>


-- 
Jeff Squyres
Server Virtualization Business Unit
Cisco Systems