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High overhead on KNL for LULESH2.0 #92

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twang15 opened this issue Jan 18, 2018 · 0 comments
Open

High overhead on KNL for LULESH2.0 #92

twang15 opened this issue Jan 18, 2018 · 0 comments

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@twang15
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twang15 commented Jan 18, 2018 •
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@tgamblin @davidbeckingsale
Caliper overhead on KNL (LULESH2.0) is 20%. What would be the possible cause?

#configurations
CALI_CONFIG_PROFILE = serial-trace
ICC 17.0.4
Linked w/ iomp5 or gomp (results similar)

#threads | O3 | O3 w/ caliper instrumentation | overhead
------------ | -------------
8 | 33.77 | 42.18 | -0.199
16 | 21.55 | 25.44 | -0.153
32 | 21.81 | 24.84 | -0.122
64 | 24.83 | 28.13 | -0.117
128 | 24.98 | 27.01 | -0.075
256 | 30.72 | 32.92 | -0.067
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@twang15