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Skew SUMMA communication to avoid bottlenecks #27982

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Skew SUMMA communication to avoid bottlenecks #27982

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12 changes: 11 additions & 1 deletion test/studies/spsMatMatMult/MatMatMult.chpl
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Original file line number Diff line number Diff line change
Expand Up @@ -50,15 +50,25 @@ module MatMatMult {

ref targLocs = A.targetLocales();

if (targLocs.dim(0) != targLocs.dim(1)) {
halt("sparseMatMatMult() currently assumes a square target locale array");
}

const numBlocks = targLocs.dim(0).size;

if countComms then startCommDiagnostics();
var time: stopwatch;
time.start();

coforall (locRow, locCol) in targLocs.domain {
on targLocs[locRow, locCol] {

var spsData: sparseMatDat;

for srcloc in targLocs.dim(0) {
for loc in targLocs.dim(0) {
// Skew the row/col we access to avoid communication bottlenecks
const srcloc = (loc + locRow)%numBlocks;

// Make a local copy of the remote blocks of A and B; on my branch
// this will also make a local copy of the remote indices, so long
// as these are 'const'/read-only
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