# Depletion simulation on supercomputer gets stuck between depletion steps.

**URL:** <https://openmc.discourse.group/t/depletion-simulation-on-supercomputer-gets-stuck-between-depletion-steps/606>\
**Category:** User Support\
**Created:** [May 19, 2020, 7:12pm UTC](https://openmc.discourse.group/t/depletion-simulation-on-supercomputer-gets-stuck-between-depletion-steps/606 "2020-05-19T19:12:20Z")\
**Posts on this page:** 1\
**Showing post:** 21

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**Author:** ![pdeng](https://avatars.discourse-cdn.com/v4/letter/p/4da419/32.png) [@pdeng](https://openmc.discourse.group/u/pdeng)\
**Post date:** [February 6, 2021, 3:17am UTC](https://openmc.discourse.group/t/depletion-simulation-on-supercomputer-gets-stuck-between-depletion-steps/606/21 "2021-02-06T03:17:43Z")

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Hello Andrew,

Recently I am using OpenMC for depletion on the UMich supercomputer Greatlakes. I installed OpenMC from source for MPI parallelization, which worked perfectly for steady-state transport simulations. When I learned to perform depletion calculations using the PythonAPI, I do not know how to instruct OpenMC to run in MPI parallelization. Since the transport simulation is much more time-consuming than depletion part, probably we can somehow let OpenMC execute in MPI mode while doing depletion serially or in OpenMP parallelization as a remedy for now. Can we do that?

Best,

Puran

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