Parallel Simulation Question

From: McGuire, Kelly (
Date: Sat Mar 16 2019 - 23:30:08 CDT

I was able to get ORCA set up for running in parallel with my QMMM simulation. I specified 16 processors for ORCA to use. But, it seems to be taking longer than one processor. One processor was able to finish one step of my 100 step QMMM minimization in 35 minutes. With 16 processors in parallel, it has bee running for 1 hour and is still running. This is still the first step of the 100 minimization steps. My ORCA output seems to be stopped a certain spot and nothing seems to be progressing. Here is what the ORCA output shows:

           * Program running with 16 parallel MPI-processes *
           * working on a common directory *
 One Electron integrals ... done
 Pre-screening matrix ... done

     I hasn't progressed from this point so far (1 hour runtime). I don't see any errors or warnings.

Kelly L. McGuire

PhD Candidate


Department of Physiology and Developmental Biology

Brigham Young University

LSB 3050

Provo, UT 84602

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