[OMPI users] Low cpu utilization due to high IO operations of openmpi

2012-10-21 Thread Mahmood Naderan
Dear all, We have a diskless cluster with these specs: 1) A server which has some disks. Root directories (/usr, /lib, ...) are on /dev/sda while /home is on /dev/sdb and these are two physical hard drives. 2) Some compute nodes. These don't have any disk drive instead they are connected thr

Re: [OMPI users] 2 GB limitation of MPI_File_write_all

2012-10-21 Thread Eric Chamberland
Hi Rayson, thanks for the informations! The problem now is that I am in the same situation that guy described: I must think of specific code to bypass that limitation and with the need to write an irregularly indexed array (http://www.mcs.anl.gov/research/projects/mpi/usingmpi2/examples/more

Re: [OMPI users] ptmalloc2 problem with ICC 12.1 and OpenMPI 1.6.1

2012-10-21 Thread tmishima
Hi Roland, this is a typical behavior of TSD_DATA_HACK problem I pointed out. Please see my previous post entitled "-DUSE_TSD_DATA_HACK problem in openmpi's ptmalloc2". The problem will be fixed in the future release. > Hi, > > my application crashes with > /shared/openmpi-1.6.1/intel/lib/lib