# Is --oversubscribe a default when run ff-mpirun

**URL:** <https://community.freefem.org/t/is-oversubscribe-a-default-when-run-ff-mpirun/4204>\
**Category:** General Discussion\
**Created:** [January 27, 2026, 9:47am UTC](https://community.freefem.org/t/is-oversubscribe-a-default-when-run-ff-mpirun/4204 "2026-01-27T09:47:29Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![zxss](https://avatars.discourse-cdn.com/v4/letter/z/bc8723/32.png) [@zxss](https://community.freefem.org/u/zxss)\
**Post date:** [January 27, 2026, 9:47am UTC](https://community.freefem.org/t/is-oversubscribe-a-default-when-run-ff-mpirun/4204/1 "2026-01-27T09:47:29Z")

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Hi, I find that every time I run ff-mpirun, it always has --oversubscribe even when I choose only 1 processor, shows as  
 ![Screenshot from 2026-01-27 09-46-06](https://canada1.discourse-cdn.com/flex030/uploads/freefem/original/2X/b/b8b0bfb45a7aea87cb0ecd92afd9f51a1122ca8a.png)

So is --oversubscribe a default here?

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**Author:** ![prj](https://avatars.discourse-cdn.com/v4/letter/p/ecae2f/32.png) [@prj](https://community.freefem.org/u/prj)\
**Post date:** [January 27, 2026, 8:40pm UTC](https://community.freefem.org/t/is-oversubscribe-a-default-when-run-ff-mpirun/4204/2 "2026-01-27T20:40:28Z")

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With Open MPI, yes, but with one process, it doesn’t make a difference.