Ifpack2: Fused block jacobi #13837
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Ifpack2: Fused block jacobi #13837
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brian-kelley
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pkg: Ifpack2
impacting: performance
client: SPARC
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More performant path for block Jacobi case inside BTDS (GPU only, BlockCrs only). Fuses residual and solve into one kernel and doesn't convert vectors to SIMD-packed format. Also inverts diag blocks fully in shared to speed up numeric. Signed-off-by: Brian Kelley <[email protected]>
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Not always equal to vector_length/2, since vector_length can theoretically be 1 Signed-off-by: Brian Kelley <[email protected]>
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More performant paths for block Jacobi case inside BTDS (GPU only, BlockCrs only).
Compared to #13805, this gives between 9% (bs = 7) and 33% (bs = 11) speedup on the overall solve and about 1.9x speedup in numeric setup for both block sizes. Note: this was measured on a single GPU run, so the speedup only applies to local computation. Multi-rank runs will speed up less due to time spent doing communication.
@trilinos/ifpack2
Related Issues
Follows #13805
Stakeholder Feedback
Will ask SPARC team to evaluate.
Testing
Tested in Ifpack2_BlockTriDiContainerUnitAndPerfTests, and ran this on OpenMP, Cuda and HIP. For Cuda tested double, float and complex_double.