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<div class="">On , 2021Dec11, at 17:56, Rohan Yadav <<a href="mailto:rohany@alumni.cmu.edu" class="">rohany@alumni.cmu.edu</a>> wrote:</div>
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<div class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">40
mpi ranks on a single node should be similar performance as 40 threads. Both petsc and taco are doing a row-based parallelism strategy so it should line up.</span></div>
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<div class="">An MPI division of rows is static. Petsc divides strictly by numbers of rows.</div>
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<div class="">A thread based system can do things like “schedule(guided)” (OpenMP) and get better load balancing if the rows have widely differing numbers of nonzero.</div>
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<div class="">Victor.</div>
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