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CosmoMC outputs 1 chain

Posted: July 23 2020
by Rishi Babu
Hi all
I'm running CosmoMC on ifort version 18.0.5.274 and OpenMpi on a campus server.
The number of processors used in the simulation is 8 but I get the chain output from only one.
Any help/suggestions would be appreciated.
Thanks

Re: CosmoMC outputs 1 chain

Posted: July 23 2020
by Antony Lewis
Are you using mpirun (or runMPI.py)? Check it is being compiled with MPI.

Re: CosmoMC outputs 1 chain

Posted: August 19 2020
by Rishi Babu
Antony Lewis wrote:
July 23 2020
Are you using mpirun (or runMPI.py)? Check it is being compiled with MPI.
Hi Antony
I was able to solve the single output error using MPICH instead of OpenMPI. But the run is really slow while using mpich and even after submitting the run for 1 day the convergence r-1 was bad. Is there a specific reason to why its happening?
Thanks in advance
Rishi