Hi, everyone.
I compiled marss-0.1.2 with "scons -Q debug=1 c=4".
And I run the benchmark "blackscholes" with thread number = 8, from the
parsec-2.1 suite, which is provided by the marss86 website.
I run this benchmark with 100m instructions two times, with the same
configuration. When I run the benchmark, only ROI (Region of Interest) is
logged.
But the result of each time is significantly different. One IPC is
1.79, and the other is 4.29. I read the IPC from ptlsim.log file.
When I compare their stats file, I found that the one with Higher ipc
has 99.9% instructions in kernal64 mode (stats file -> external -> total ->
insns_in_mode), while the one with Lower ipc has only 1.8% instructions in
kernal64 mode.
Does anyone have any idea why the ipc differ so much? and how to solve
it?
Xiuyuan
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