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20018778
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2013-11-16T13:02:01.427
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2013-11-16T13:02:01.427
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20017814
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One solution is to use MPI_IProbe() to test if a message is waiting. <ul> <li>On this line, use a pointer instead of "12" <pre><code>MPI_Isend(12, 1, MPI_INT, 0, 100, MPI_COMM_WORLD, &request); </code></pre></li> <li>Add flag=0 here : <pre><code>while(flag!=0) { // something done that at some point changes flag } </code></pre></li> </ul> Here goes the code : <pre><code>#include "mpi.h" #include "stdio.h" int main(int argc, char *argv[]) { int numprocs, rank; MPI_Request request; MPI_Status status; MPI_Init(&argc, &argv); MPI_Comm_rank(MPI_COMM_WORLD, &rank); MPI_Comm_size(MPI_COMM_WORLD, &numprocs); if(rank == 0) // the searching process { int i; for (i=0; i < 4000000; i++) { // do some stuff here; does not matter what //printf("I am still running!\n"); int flag; MPI_Iprobe(MPI_ANY_SOURCE,100,MPI_COMM_WORLD,&flag,&status); if(flag!=0){ int value; MPI_Recv(&value, 1, MPI_INT, status.MPI_SOURCE, status.MPI_TAG, MPI_COMM_WORLD, &status); printf("I (0) received %d \n",value); } /* see if any message has been transmitted to me at this point without blocking the process; if at this time it happens to be transmitted, do something and than continue with for iternations; or just continue with for iterations and maybe next time will have a message which sends me to do something */ } } else { int i; for(i=0;i<42;i++){ int flag = 1; while(flag!=0) { // something done that at some point changes flag flag=0; } int bla=1000*rank+i; // send a message to process with rank 0 and don't get stuck here MPI_Isend(&bla, 1, MPI_INT, 0, 100, MPI_COMM_WORLD, &request); // some other stuff done printf("I (%d) do something\n",rank); // wait for message to be transmitted MPI_Wait(&request, &status); } } MPI_Finalize(); return 0; } </code></pre> Bye, Francis
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singulars
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1. This table or related slice is empty.
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1. POSearch/wait for any transmission in MS-MPI
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1. USfrancis
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