I would suggest usenet. comp.parallel.mpi is a good place to start. It
is an underutilized resource that can actually be very helpful. There
are a lot of us out there who have significant experience using MPI and
are willing to assist new users.
Dave.
karla b wrote:
> Hi Brian, many thanks for the response
>
>
>>So what exactly is the problem you are seeing? We (the LAM developers)
>>unfortunately can not provide general debugging assistance - there are
>>too many users and not nearly enough developers. That being said,
>>we're more than willing to answer specific questions you might have
>>about MPI and specifically about the LAM implementation.
>
>
> I completely understand what you are saying here, however I would
> point out that for new users there seem to be very few places to go to
> receive help when attempting to scale the learning curve of parallel
> programming. Although this problem was posted here, suggestions came
> originally from a subscriber to the list, it simply raises the issue
> of where else is there a central repository of working know how and
> experience? experts exchange for example list only 79 mpi related
> queries.
>
> Most searches on the internet seem to point to academic style lecture
> notes/publications or very high end applications, the nature of which
> can often be very specific or just difficult to comprehend for
> newcommers to parallel programming. As I'm sure was the case with
> everyone subscribed, we all had to learn somewhere and of course by
> attemping solutions and having mistakes pointed out usually leads to
> far better learning than trying to decipher existing code and tailor
> it, so that said, thanks again for pointing out the errors, is there
> anywhere else then that I can go so that I don't keep annoying the LAM
> developers but may get in touch with people who may point out newbie
> (silly) mistakes ??? ; )
>
> Many thanks,
> k
>
>
>>I do see a couple of problems with your code that seem to indicate a
>>misunderstanding of the MPI send/recv interfaces. You might want to
>>find a good resource on using MPI and work through the examples. One I
>>would suggest is the NCSA's Introduction to MPI:
>>
>> http://webct.ncsa.uiuc.edu:8900/public/MPI/
>>
>>In particular, in the client you have an MPI_Waitany at the top of a
>>while(1) loop, but only post a non-blocking operation outside of the
>>while() loop. This might work the first time through the loop, but
>>after that, you might not have any requests that can be progressed to
>>completion. You also don't call any Test or Wait functions for the
>>non-blocking communication used in the master, so the communication may
>>never complete there.
>>
>>
>>Hope this helps,
>>
>>Brian
>>
>>--
>> Brian Barrett
>> LAM/MPI developer and all around nice guy
>> Have an LAM/MPI day: http://www.lam-mpi.org/
>>
>>
>
> _______________________________________________
> This list is archived at http://www.lam-mpi.org/MailArchives/lam/
>
--
Dr. David Cronk, Ph.D. phone: (865) 974-3735
Research Leader fax: (865) 974-8296
Innovative Computing Lab http://www.cs.utk.edu/~cronk
University of Tennessee, Knoxville
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