TurbSim: OpenMP parallelization in factorization and FFT #3020
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- Very cludgy mess. Seems to work locally though.
andrew-platt
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The TRH_in in the SHARED was causing memory issues. Removing that makes things identical now.
No need for the inner loop.
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Needs some review and testing.
Feature or improvement description
TurbSim has been single-threaded forever. This PR adds parallelization through OpenMP and should in theory run faster as a result.
If OpenMP is enabled at compile time, parallelization for MKL will be automatically turned off. We saw this the MKL parallelization is an issue in #3018 when the MKL would try to parallelize some tiny matrix manipulation incurring massive overhead costs.
Still need to extend to the following routines:
CalcFourierCoeffs_APICalcFourierCoeffs_GeneralCalcFourierCoeffs_NoneRelated issue, if one exists
#3018
Impacted areas of the software
TurbSim only
Additional supporting information
PRIVATE(<allocatable_array>)in a!$OMP PARALLEL DOpragma doesn't always allocate the copy of that array. This leads to segfaults. I have messy workarounds for this. There may be a better way to do it, but I have no idea if the ROCM Flang compiler will be able to handle anything more advanced.Test results, if applicable
No test results should change.