Re: [Boost-users] boostMPI asychronous communication

28 Jun 2010


      Thanks, 
This is the main part of me code, which may have deadlock. 

Master: 
for (iRank = 0; iRank < availableRank ; iRank++){
destRank = iRank+1;
for (taski = 1; taski <=  TaskNumPerRank ; taski++){resultSourceRank = destRank;
recvReqs[taskCounterT2] = world.irecv(resultSourceRank, upStreamTaskTag, resultTaskPackageT2[iRank][taskCounterT3]);
reqs = world.isend(destRank, taskTag, myTaskPackage);
++taskCounterT2;}

// taskTotalNum = availableRank * TaskNumPerRank // right now, availableRank =1, TaskNumPerRank =2
mpi::wait_all(recvReqs, recvReqs+(taskTotalNum));
-----------------------------------------------worker: 
while (1){world.recv(managerRank, downStreamTaskTag, resultTaskPackageW);
do its local work on received task;
destRank = masterRank;
reqs = world.isend(destRank, taskTag, myTaskPackage);if (recv end signal) 	break;}
Any help is appreciated.
Jack
...
Date: Mon, 28 Jun 2010 17:29:19 +0200
From: riccardo.murri@gmail.com
To: boost-users@lists.boost.org
Subject: Re: [Boost-users] boostMPI asychronous communication
Hi Jack,
On Mon, Jun 28, 2010 at 5:18 PM, Jack Bryan  wrote:
...
I just posted irecv before isend.
master node:
request=irecv();
do its local work;
isend(message to worker nodes);l
wait(request).
worker node:
while(stil have new task ){
recv(message);
do its local work;
isend(result message to master)
}
if there is only one task to worker, it works.
But, if there are 2 tasks to workers, master cannot get the result from
worker.
Smells of deadlock. Maybe the master is waiting for a message coming
from the wrong worker?
We might need to delve into details; can you please post a minimal
Boost.MPI program exhibiting this "blocking" behavior?
Best regards,
Riccardo
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