Although this doesn't help you in the immediate future, let me drop a
rather unsubtle hint and say that support for MPI_THREAD_MULTIPLE is
probably only a few months away.
Stay tuned to this list for more details...
On Thu, 10 Jun 2004, Michael Lees wrote:
> Hi again
>
> Would the lam-mpi development group consider implementing something similar
> to what is suggested here,
>
> http://wwwcs.upb.de/cs/plachetk/europvmmpi2002.pdf
>
> It might be any easy way of fixing the thread safety issue with little work?
>
> Thanks
>
> Michael Lees wrote:
>> Hi all,
>>
>> I feel like I'm attempting a some what standard problem and that there
>> must be better solutions to what I have so far.
>>
>>
>> I'm attempting to design a system which has an asynchronous MPI interface
>> in the form of a 'communication port'. This port interfaces with two
>> queues, send and receive. The port should always listen to MPI, ie.,
>> always have some form of MPI_RECV posted, and place any message that comes
>> from MPI into the receive queue of the port. The port should also monitor
>> the send queue and make an MPI_SEND command when items are placed into the
>> send queue.
>>
>> Now intuitively I'd have a port with two fairly simple threads, send and
>> receive which use condition variables to wake the appropriate threads.
>>
>> Send Thread
>> {
>> Wait(sendQinsert)
>> get Item from sendQ
>> MPI_Send...
>> }\\loop
>>
>>
>> Receive Thread
>> {
>> MPI_RECV...(block until Recv arrives)
>> put msg in recv queue
>> signal(recvQinsert)
>> }\\loop
>>
>>
>> Now this isn't possible with the current lam-mpi as it doesn't support
>> MPI_THREAD_MULTIPLE. I'm sure I can't be the only person trying to perform
>> asynchronous send and receives to an MPI process? Is there a standard
>> method to implementing this kind of design, either by collapsing into a
>> single sendANDreceive thread or by applying appropriate mutex locks?
>>
>> Thanks
>>
>
>
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--
{+} Jeff Squyres
{+} jsquyres_at_[hidden]
{+} http://www.lam-mpi.org/
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