Differences

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--- quantum_espresso [2022/06/20 18:32]
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+++ quantum_espresso [2022/06/20 18:40]
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 QE 7.1 is slightly slower than 6.8 on Pinnacle I & II and slightly faster on Trestles.
-''OMP_NUM_THREADS>1'' is a substantial slowdown versus 1 or unset.
+''OMP\_NUM\_THREADS>1'' is a very substantial slowdown versus 1 or unset.
-The bulldozer version runs on Intel but is significantly slower than the skylake version.
+The bulldozer version runs on Intel but is significantly slower than the skylake version (other older platforms such as E5 condo nodes won't run AVX512 codes and would probably benefit from their own version).
-The uncrowded Trestles system has relatively good performance on QE if memory (64 GB) allows.
+The usually zero-wait Trestles system has relatively good performance on QE if shared memory (64 GB) allows (relatively meaning ~1/2 of Pinnacle I performance when for some programs it is ~1/5)

Arkansas High Performace Computing Center [hpcwiki]