hipblasLtMatmul api usage

[Cydia2018]

I would like to ask whether it is necessary to callhipblasLtMatmulAlgoGetHeuristic() to search algo before executing hipblasLtMatmul()? When I set the three parameters of hipblasLtMatmulAlgo_t *algo, void *workspace, size_t workspaceSizeInBytes of hipblasLtMatmul() to nullptr, nullptr, and 0 respectively, the segment fault occurred.

[KKyang]

Yes, it is necessary. Here is the sample, https://github.com/ROCmSoftwarePlatform/hipBLASLt/blob/a103f27d91f0dcd3abdcf262c18a601172b2d3ea/clients/samples/gemm/sample_hipblaslt_gemm.cpp#L153

or you can use getAllAlgos to get the solutions. https://github.com/ROCmSoftwarePlatform/hipBLASLt/blob/a103f27d91f0dcd3abdcf262c18a601172b2d3ea/clients/samples/gemm_get_all_algos/sample_hipblaslt_gemm_get_all_algos.cpp#L103

[ppanchad-amd]

@Cydia2018 Do you still need assistance with this ticket? If not, please close the ticket? Thanks!

[ppanchad-amd]

Hi @Cydia2018. Hopefully your issue is resolved. Closing ticket. If you still need assistance, please feel free to re-open ticket. Thanks!