I was wondering if you would be able to provide any advice for me on an issue I'm having. I'm working on a server trying to get the MPI version of mrbayes installed so I can use more than 1 processor at a time. To do this, mrbayes must be complied with the -mpi flag set.

I've downloaded the source version from the website, and compiled it following the mpi instructions which are as follows:

autoconf

./configure --enable-mpi=yes

make

Once that is done you should be able to start the program mrbayes(mb) through the following command:

mpirun -np 8 mb

where -np is the number of processors.

However I'm finding that this isn't opening a parallel version of mrbayes, it is instead opening 8 versions of mrbayes on the server at once. I also tried this on my local Ubuntu machine as I thought that it was something that I was doing wrong, however this works fine here and I can get it to work in parallel mode. At first I thought that it wasn't working as the MPICH daemon wasn't running to allow the communication between cores, however I checked and it is. I also checked my complication to ensure that mpi mode was correctly enabled and it also is. I have sudo access to the server so it also isn't an issue of permissions.

I was wondering if anybody came across this problem before and if so if you knew how to solve it?

Thanks, I really appreciate you taking the time to read this. Any advice you may have would be appreciated.