severe performance regression on Piledriver
I measure 20-30% performance regression in the non-bonded kernels on AMD Piledriver. The bonded kernels seem to have regressed too, but the effect here is only 4-8%.
The former has barely changed in 5.1. The bonded performance has improved in 5.1, but the source of the original issue may have simply been masked by unrelated improvements (in reduction and RB dihedrals).
#1 Updated by Berk Hess over 2 years ago
- Status changed from New to In Progress
For a water box with PME I get 88 sec in nbnxn kernel with 4.6 and 140 sec with 5.1!
The only difference I found in the log files is that -Wno-strict-overflow -fomit-frame-pointer have been removed. Adding those gives 102 sec, so an enormous difference, but still 15% slower than 4.6.