I am new on using clusters. I have just installed mpiblast 1.4.0 with ncbi toolbox (June 2005) from source codes on a linux cluster [x86_64/x86_64 (GNU/Linux), CentOS]. The installation seemed to be successful. Now when I try the following: > /opt/openmpi.gcc/bin/mpirun -np 14 /usr/local/bin/mpiblast -p blastn -i /raid/pub/ncbi/blast/db/BTrsSNP -d bta.genome.chr -o out1 -e 0.0000000001 -W 38 -v 1 -b 1 and immediately got following errors: ---------------- MPI_ABORT invoked on rank 0 in communicator MPI_COMM_WORLD with errorcode 0 mpirun noticed that job rank 1 with PID 28131 on node xxxx.xxxxxx.xxx exited on signal 15 (Terminated). 12 additional processes aborted (not shown) -------------------------------- Maybe I am missing something obvious? Could anyone point to the right place for tracing the problem? ... Zhiliang