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  • #27

Closed
Open
Created Feb 05, 2019 by Bitbucket Importer@bitbucket_importerMaintainer

Memory leak with MPI + h5py state_phys

Created originally on Bitbucket by avmo (Ashwin Vishnu)

Earlier I had messaged in the fluiddyn-dev chatroom that:

I get out of memory errors on my jobs.

Symptoms

I am running a series of simulations with nh=2880 and using sw1l.onlywaves solver. I write a state_phys file every t=1. When the simulation reaches t=10, it runs out of memory. I resume and again when it reaches t=20 it fails again. It has to be related to the output files to happen at regular intervals for all jobs, irrespective of the number of iterations.

Now when I launched a fresh simulation with nh=1920, it ran out of memory at t=17. This delayed failure makes me suspect the h5py+mpi implementation.

What I have tried so far

  • Ensure the jit extensions are compiled on the cluster.
  • I have recompiled and executed h5py tests successfully.

Yet the out-of-memory errors continue.

TODO:

  • Profile memory with h5py and MPI. https://jmdana.github.io/memprof/
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