Use async sends in particle communication #4257
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WeiqunZhang
requested changes
Dec 9, 2024
| @@ -169,8 +170,9 @@ void ParticleCopyPlan::buildMPIStart (const ParticleBufferMap& map, Long psize) | |||
| AMREX_ASSERT(Who >= 0 && Who < NProcs); | |||
| AMREX_ASSERT(Cnt < std::numeric_limits<int>::max()); | |||
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| ParallelDescriptor::Send((char*) snd_data[i].data(), Cnt, Who, SeqNum, | |||
| ParallelContext::CommunicatorSub()); | |||
| auto msg = ParallelDescriptor::Asend((char*) snd_data[i].data(), Cnt, Who, SeqNum, | |||
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We only need to save ParallelDescriptor::Asend(...).req(), and later we can call Waitall on the vector.
WeiqunZhang
reviewed
Dec 9, 2024
WeiqunZhang
approved these changes
Dec 9, 2024
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This changes a few instances of
ParallelDescriptor::SendtoParallelDescriptor::Asend. This improves the overall runtime of the redistribute benchmark by a few percent for multi-node runs:The proposed changes: