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Only use blocking sizes LUTs for single-thread products for now

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Benoit Jacob 2015-03-31 11:17:23 -04:00
parent 0cbd5ae3cb
commit 73cdeae1d3
1 changed files with 8 additions and 0 deletions
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8
Eigen/src/Core/products/LookupBlockingSizesTable.h
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@ -79,6 +79,14 @@ template <typename LhsScalar,
typename RhsScalar>
bool lookupBlockingSizesFromTable(Index& k, Index& m, Index& n, Index num_threads)
{
if (num_threads > 1) {
// We don't currently have lookup tables recorded for multithread performance,
// and we have confirmed experimentally that our single-thread-recorded LUTs are
// poor for multithread performance, and our LUTs don't currently contain
// any annotation about multithread status (FIXME - we need that).
// So for now, we just early-return here.
return false;
}
return LookupBlockingSizesFromTableImpl<LhsScalar, RhsScalar>::run(k, m, n, num_threads);
}