How many nodes are you using? How many processes per node? What kind of 
processor? Open MPI version? 25 GB is several orders of magnitude more memory 
than should be used except at extreme scale (1M+ processes). Also, how are you 
calculating memory usage?


> On Dec 20, 2018, at 4:49 AM, Adam Sylvester <> wrote:
> Is there a way at runtime to query OpenMPI to ask it how much memory it's 
> using for internal buffers?  Is there a way at runtime to set a max amount of 
> memory OpenMPI will use for these buffers?  I have an application where for 
> certain inputs OpenMPI appears to be allocating ~25 GB and I'm not accounting 
> for this in my memory calculations (and thus bricking the machine).
> Thanks.
> -Adam
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