[gmx-users] Dynamic Load Balancing Crash

Daniel Kozuch dan.kozuch at gmail.com
Sun Nov 5 16:13:55 CET 2017


I recently started experiencing a error with GROMACS 2016.3 during a
replica exchange simulation with 80 replicas, 480 cpus, and 40 GPUs:

Assertion failed:
Condition: comm->cycl_n[ddCyclStep] > 0
When we turned on DLB, we should have measured cycles

The simulation then crashes. I turned off DLB with the flag "-dlb no" and
the error did not resurface so I have to assume it really is the DLB
causing the issue.

Does anyone know what might be causing this?


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