Problem with mpi_waitAll in application using openfoam -- CFD Online Discussion Forums

March 9, 2016, 08:20	Problem with mpi_waitAll in application using openfoam	#1
shivaramakrishna New Member shiva rama krishna Join Date: Mar 2016 Posts: 4 Rep Power: 10	Hi, I am novice to openfoam. I have written a application using openfoam 1.7.x. When I profiled the application, I noticed that, mpi_waitall is taking 92% of the mpi time. I am currently running my application on 2 node cluster which are connected via infiband. I found couple of flags such as coll_fca_enable which can increase the performance of collective calls such as mpi_AllReduce. I am wondering if there are any run time parameters or optimization techniques to decrease mpi_waitall time. Any help on this is appreciable. Thanks SivaRamaKrishna

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