Hi, could you also attach your current code ?
Regards Björn From: users-boun...@open-mpi.org [mailto:users-boun...@open-mpi.org] On Behalf Of seshendra seshu Sent: den 3 maj 2012 13:49 To: Open MPI Users Subject: [OMPI users] Regarding the execution time calculation Hi, I have written an parallel program and when i run my program on 4,8,16 nodes and calculated the execution time at master using MPI_Wtime in master node. The problem the execution time is increasing rapidly like NON parallel program-55 sec, and for parallel program 2-nodes--60sec , 4-nodes 74sec, 8-node--120 sec and for 16 nodes---for 180 sec. can i know my problem in parallel version actually the time needs to be decreased but it is increasing i dont the reason. i have calculated my time as shown below main(argv,argc) { double start,end; start= MPI_Wtime; // done some work { // start send from master node and receiving it end =MPI_Wtime; cout<<"execution time"<<end-start; } //in slave nodes done some work MPI_Finalize; } Please help me in solving this problem. -- WITH REGARDS M.L.N.Seshendra
