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how to calculate Mispredicted Branches Retired per Branch Instruction Retired?

softarts
Beginner
‎12-09-2009 04:31 AM
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The software optimization cookbook,chapter 7 show us how to calculate the mispredicted branches retired,
but I still have one question about it.

the book

1.Vtune windows has the ratio"Branch Misprediction per Branch Instruction Retired is 0.255 for functio check_3dd,
but Vtune Linux only show the function "check_3odd" occupy 88% total Branch mispredictedion. and no this option in the activity configuration / ratios

2.so I have to calculateratio by myself, "Branch Misprediction per Branch Instruction Retired=BR_INST_RETIRED.MISPRED / BR_INST_RETIRED.ANY"??
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Vladimir_T_Intel
Moderator
‎12-09-2009 04:47 AM
291 Views
Quoting - softarts
The software optimization cookbook,chapter 7 show us how to calculate the mispredicted branches retired,
but I still have one question about it.

the book

1.Vtune windows has the ratio"Branch Misprediction per Branch Instruction Retired is 0.255 for functio check_3dd,
but Vtune Linux only show the function "check_3odd" occupy 88% total Branch mispredictedion. and no this option in the activity configuration / ratios

2.so I have to calculateratio by myself, "Branch Misprediction per Branch Instruction Retired=BR_INST_RETIRED.MISPRED / BR_INST_RETIRED.ANY"??

There is no difference in calculating the branch misprediction ratio on Windows and Linux. So, if there is no such a ratio in VTune for Linux (which I can't check at the moment), you can calculate it manually (i.e. using Excel spreadsheet). Was that the question?

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softarts
Beginner
‎12-09-2009 05:09 AM
291 Views

There is no difference in calculating the branch misprediction ratio on Windows and Linux. So, if there is no such a ratio in VTune for Linux (which I can't check at the moment), you can calculate it manually (i.e. using Excel spreadsheet). Was that the question?


no,just curious that no this ratio on Linux,but Windows has.
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Vladimir_T_Intel
Moderator
‎12-09-2009 05:12 AM
291 Views
Quoting - softarts

no,just curious that no this ratio on Linux,but Windows has.
Must be somebody overlooked it. But you can create your own.
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