[openib-general] openMPI for 2.6.17.10 kernel

[Jeff Squyres]

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