[mvapich-discuss] MPI blocking mode progress with 10GbE/ iWARP

[Ken Cain]

Hello Sundeep,

Thank you for your response. I have some additional questions below.

Sundeep Narravula wrote:

>Hi ken,
>
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>>I am investigating if it will be possible to achieve blocking mode
>>progress (not polling) using an MPI library on a 10GbE/iWARP cluster.
>>The MVAPICH2 library parameter MV2_USE_BLOCKING describes what I am
>>looking for, but I believe it applies only to the Gen2 InfiniBand
>>transport. Is this true? Is blocking mode progress being considered for
>>inclusion in the Gen2-iWARP transport in a future MVAPICH2 release? How
>>difficult (or reasonably possible) is this to do by modifying the
>>Gen2-iWARP transport source code, either on my own or by the MVAPICH2
>>team? Is there an inherent problem unique to 10GbE?
>>    
>>
>
>Currently, full support for blocking mode is not enabled for the
>Gen2-iWARP device in mvapich2. You should be able to run mvapich2 in
>blocking mode but currently this will not handle more than one process per
>node. We plan to include full blocking support in mvapich2 for
>the Gen2-iWARP device soon.
>  
>
I would like to run mvapich2 in blocking mode (i.e., do not take up any 
CPU while waiting for incoming messages).  I would like this even when I 
am running one MPI process per node. What are the prerequisites to 
achieve this using the current Gen2-iWARP transport? Should I simply use 
the MV2_USE_BLOCKING parameter (knowing that it is documented to only 
work for the Gen2-InfiniBand transport)? Or do I need to take into 
account additional parameters such as the threading support parameter to 
the mvapich2 library build?

Thank you,

-Ken

>  
>
>>I'm making some assumptions with my questions above. One for example is
>>that MVAPICH (VIADEV_USE_BLOCKING) is not a candidate solution because
>>MVAPICH does not run on 10GbE/iWARP clusters. Perhaps I am wrong with
>>this assumption?
>>    
>>
>
>You are correct here. mvapich does not currently support 10GbE/iWARP
>devices. You will need to use mvapich2 for this.
>
>Regards,
>  --Sundeep.
>
>  
>
>>Thank you,
>>
>>-Ken
>>
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>>mvapich-discuss at cse.ohio-state.edu
>>http://mail.cse.ohio-state.edu/mailman/listinfo/mvapich-discuss
>>
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