I did more trials on fixing possible problems with "mpiblast" installations. Now I have compiled mpiblast-1.4.0 along with ncbi tool kit (June 2005), with mpicc --version gcc (GCC) 4.1.1 20070105 (Red Hat 4.1.1-52) and run it with mpirun (Open MPI) 1.2.3, as following, and have errors: > /opt/openmpi.gcc/bin/mpirun -np 14 -machinefile /home/zhu/tests/new/machines /home/local/bin/mpiblast -p blastp -i ./bait.fasta -d ecoli.aa > blastoutput.txt 1 0.087774 Bailing out with signal 11 [node001:13274] MPI_ABORT invoked on rank 1 in communicator MPI_COMM_WORLD with errorcode 0 0 0.0933368 Bailing out with signal 15 [node001:13273] MPI_ABORT invoked on rank 0 in communicator MPI_COMM_WORLD with errorcode 0 13 0.13855 Bailing out with signal 15 [node001:13286] MPI_ABORT invoked on rank 13 in communicator MPI_COMM_WORLD with errorcode 0 2 0.0967469 Bailing out with signal 15 [node001:13275] MPI_ABORT invoked on rank 2 in communicator MPI_COMM_WORLD with errorcode 0 3 0.1011 Bailing out with signal 15 [node001:13276] MPI_ABORT invoked on rank 3 in communicator MPI_COMM_WORLD with errorcode 0 4 0.105819 Bailing out with signal 15 [node001:13277] MPI_ABORT invoked on rank 4 in communicator MPI_COMM_WORLD with errorcode 0 5 0.109716 Bailing out with signal 15 [node001:13278] MPI_ABORT invoked on rank 5 in communicator MPI_COMM_WORLD with errorcode 0 6 0.113549 Bailing out with signal 15 [node001:13279] MPI_ABORT invoked on rank 6 in communicator MPI_COMM_WORLD with errorcode 0 7 0.117464 Bailing out with signal 15 [node001:13280] MPI_ABORT invoked on rank 7 in communicator MPI_COMM_WORLD with errorcode 0 8 0.120678 Bailing out with signal 15 [node001:13281] MPI_ABORT invoked on rank 8 in communicator MPI_COMM_WORLD with errorcode 0 9 0.124318 Bailing out with signal 15 [node001:13282] MPI_ABORT invoked on rank 9 in communicator MPI_COMM_WORLD with errorcode 0 10 0.127826 Bailing out with signal 15 [node001:13283] MPI_ABORT invoked on rank 10 in communicator MPI_COMM_WORLD with errorcode 0 11 0.131605 Bailing out with signal 15 [node001:13284] MPI_ABORT invoked on rank 11 in communicator MPI_COMM_WORLD with errorcode 0 12 0.135169 Bailing out with signal 15 [node001:13285] MPI_ABORT invoked on rank 12 in communicator MPI_COMM_WORLD with errorcode 0 Does anyone has clues what this is and possibly point me to the right direction for a fix? Thanks! Zhiliang