Problem with mpi_waitAll in application using openfoam
 

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