# \#mpi

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## [GPU parallelization error, ranks not equal to gpu number](https://pyfr.discourse.group/t/gpu-parallelization-error-ranks-not-equal-to-gpu-number/661)

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**Author:** [@YoonSuKyung](https://pyfr.discourse.group/u/YoonSuKyung)\
**Replies:** 22\
**Last updated:** [20 September 2023 14:35 UTC](https://pyfr.discourse.group/t/gpu-parallelization-error-ranks-not-equal-to-gpu-number/661 "2023-09-20T14:35:16Z")

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When I run 2d euler vortex case, i got this message. Last month, I asked same question. That day I thought this message was because I have 1 gpu. Now, i install one more gpu (2 \* rtx 3090 ti gpus) It still shows th…

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## [MPI collect wait times informations](https://pyfr.discourse.group/t/mpi-collect-wait-times-informations/838)

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**Author:** [@Frankx9](https://pyfr.discourse.group/u/Frankx9)\
**Replies:** 24\
**Last updated:** [14 June 2023 14:38 UTC](https://pyfr.discourse.group/t/mpi-collect-wait-times-informations/838 "2023-06-14T14:38:51Z")

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Hi, I was trying to detect load imbalances but when using collect wait times in the backed section, my solution file only has these informations: \[data\] fields = rho,rhou,rhov,rhow,E prefix = soln \[backend\] rank-alloc…