Hi,
I am running some simulations of SPEC2006 benchmarks an noticed some
variations of the sim_cycle count when I run MARSS on different host
machines.
Just an example: ROI of GemsFDTD
I ran the simulation a couple of times on each host.
Host1: Xeon X5670 @ 2.93GHz, dual socket, HT enabled
Host2: Xeon X5675 @ 3.07GHz, dual socket, HT enabled
OS configuration is exactly the same on both machines.
Now when I compare the numbers:
Host1:
Host2:
user uops kernel uops sim_cycles
user uops kernel uops sim_cycles 7210746924 1331578150 13797811843
7210744488 1331141836 13315031456 7210745232 1331564187 13767346806
7210744417 1331064636 13343311719 7210744826 1331475921 13803067702
7210745025 1331429686 13362192919 7210744068 1331046761 13778895729
7210745138 1331530721 13371649704 7210743664 1331602038 13741170045
7210746956 1332519415 13340211019 7210745221 1331551159 13765271526
7210744700 1332103942 13357991805 7210747188 1331712213 13739122442
7210744523 1331264662 13289832849 7210745019 1331550151 13758991929
7210744052 1331141885 13791512144
The number of simulated instructions is pretty stable for all runs, but the
sim_cycles, hence the IPC number differ.
Any idea what the reason for this might be, as it seems that those
differences more or less correlate with the clock rate of the host.
Regards,
Stefan
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