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amo: apply fast-path analysis and optimization #117

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minsii opened this issue May 9, 2021 · 0 comments
Open

amo: apply fast-path analysis and optimization #117

minsii opened this issue May 9, 2021 · 0 comments
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@minsii
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TODO-dev TODO-evaluation
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FY21-Q3Q4

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minsii commented May 9, 2021

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)
@minsii minsii self-assigned this May 9, 2021
@minsii minsii added this to the FY21-Q3Q4 milestone May 9, 2021
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