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From: George Bosilca (bosilca_at_[hidden])
Date: 2007-03-21 21:53:22


If the only thing you really need is what you just described, then FT-
MPI is your best pick. At least until we finish moving the fault
tolerance features from FT-MPI in Open MPI. Giving you a time frame
it will be difficult, the only thing I can state it's that this will
not happens before the end of the year. At least not in the
production quality branch. I'll make an announcement on the mailing
list when such features will be available on the trunk.

   Thanks,
     george.

On Mar 21, 2007, at 6:37 PM, Mohammad Huwaidi wrote:

> The kind of recovery I am seeking after is easy, and the following
> simple example illustrates the point:
> I want to send a message to a different node. If it does not
> respond to me, I do not want my application to crash. I want to
> continue using other node resources.
>
> I hate it when a node crashes that all my MPI_WORLD goes now. Is
> there a way around that?
>
> I could give up the other extra hairy stuff, but it would be
> difficult to lose my running job whenever a node or application
> goes down.
>
> users-request_at_[hidden] wrote:
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>> Today's Topics:
>> 1. threading (Sam Adams)
>> 2. Re: users Digest, Vol 536, Issue 1 (Mohammad Huwaidi)
>> 3. Fault Tolerance (Mohammad Huwaidi)
>> 4. Re: Fault Tolerance (Thomas Spraggins)
>> 5. Re: Fault Tolerance (George Bosilca)
>> 6. MPI processes swapping out (Heywood, Todd)
>> 7. deadlock on barrier (tim gunter)
>> ---------------------------------------------------------------------
>> -
>> Message: 1
>> Date: Wed, 21 Mar 2007 11:29:34 -0500
>> From: "Sam Adams" <smadasam_at_[hidden]>
>> Subject: [OMPI users] threading
>> To: users_at_[hidden]
>> Message-ID:
>> <faa2718c0703210929h3a9b4436wa255e863f1478bd9_at_[hidden]>
>> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>> I have been looking, but I haven't really found a good answer about
>> system level threading. We are about to get a new cluster of
>> dual-processor quad-core nodes or 8 cores per node. Traditionally I
>> would just tell MPI to launch two processes per dual processor single
>> core node, but with eight cores on a node, having 8 processes seems
>> inefficient.
>> My question is this: does OpenMPI sense that there are multiple cores
>> on a node and use something like pthreads instead of creating new
>> processes automatically when I request 8 processes for a node, or
>> should I run a single process per node and use OpenMP or pthreads
>> explicitly to get better performance on a per node basis?
>
> --
>
> Regards,
> Mohammad Huwaidi
>
> We can't resolve problems by using the same kind of thinking we used
> when we created them.
> --Albert Einstein
> <mohammad.vcf>
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