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Tests performed by SCG are a demonstration of the effectiveness of the GPU gridder vs the standard CPU gridding code and should be viewed as a gate prior to verification and validation by CASA and stake holders. SCG tests will focus on questions of functionality (i.e. does it work at all, is the image scientifically plausible), profiling the performance impact of different environmental factors on imaging behavior (various test parameters (e.g. number of w-planes, image size, gpu model etc) and performance comparisons to standard CPU gridders.
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Data sets: VLASS 2.1 11 square degrees from T10t34 CNSS tile
Process: 12 Serial CPU+tclean vs 12 way parallelization of CPU+tclean() vs GPU+htclean() using awproject, nterms=1, initially with wplanes=1 and then with wplanes=32 when available, other parameters pulled from VLASS SE imaging workflow
Results: Compare images, characterize differences, compare runtimes characterizing serial CPU vs GPU performance and total system performance, extrapolate to expected scaling for full VLASS imaging with nterms=2 and full imaging workflow.
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