Quoting Junchao Zhang (2015-05-04 18:28:12)

Could you try mpich3.2b2?  I tested your code with it on my laptop. My timing is

np    time(s) 2      102.57 4      51.285 8      25.6425 16   12.8212

I did not tried mpich3.2b2 yet (will do tomorrow), but I've ask another question here, just on the time to execute MPI_Barrier: http://stackoverflow.com/questions/30039802/what-control-mpi-barrier-time-to... Seems that that was why `bench_mpi.cxx` was slow. _______________________________________________ discuss mailing list [email protected] To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss