Dear All, I had been running Gromacs 4.0.7 on a 12-node cluster (Intel i7-920 4-cores) with OS Rocks 5.4.2. Recently, I have upgraded the cluster OS to Rocks 5.4.3 and I have installed Gromacs 4.5.4 from the Bio Roll repository. When running in parallel on the same node, everything works fine. However, when I am trying to run on more than one nodes the run stalls immediately with the following message:
[gromacs@tornado Test]$ /home/gromacs/.Installed/openmpi/bin/mpirun -np 2 -machinefile machines /home/gromacs/.Installed/gromacs/bin/mdrun_mpi -s md_run.tpr -o md_traj.trr -c md_confs.gro -e md.edr -g md.log -v NNODES=2, MYRANK=0, HOSTNAME=compute-1-1.local NNODES=2, MYRANK=1, HOSTNAME=compute-1-2.local NODEID=0 argc=12 NODEID=1 argc=12 The mdrun_mpi thread seems to start in both nodes but the run does not go on and no file is produced. It seems that the nodes are waiting for some kind of communication between them. The problem occurs even for the simplest case (i.e. NVT simulation of 1000 Argon atoms without Coulombic interactions). Openmpi and networking between the nodes seem to work fine since there are not any problems with other software that run with MPI. In an attempt to find a solution, I have manually compiled and installed Gromacs 4.5.5 (with --enable-mpi) after having installed the latest version of openmpi and fftw3 and no error occurred during the installation. However, when trying to run on two different nodes exactly the same problem appears. Have you any idea what might cause this situation? Thank you in advance!
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