Direct AMO mode still shows about 2x overhead than that of SOS
Benchmark: osu_oshm_atomics_all2one (shmem_int_finc -> MPI FOP)
#SOS #direct-amo
Theta/np=2 14.88 39.22
Cori/np=2 2.67 4.21
The current atomics check in OFI can be the cause. We need analyze the atomics path and apply optimizations similer to previous RMA (IPO inline, reduce instructions on AMO path)
Direct AMO mode still shows about 2x overhead than that of SOS
Benchmark: osu_oshm_atomics_all2one (shmem_int_finc -> MPI FOP)
The current atomics check in OFI can be the cause. We need analyze the atomics path and apply optimizations similer to previous RMA (IPO inline, reduce instructions on AMO path)