HP Caliper 5.3 User Guide (5900-1558, February 2011)

• Percent ret correct predictions
Percentage of return branches that predicted correctly.
• Percent ret wrong paths
Percentage of return branches that mispredicted the branch predicate.
• Percent ret wrong branch targets
Percentage of return branches that mispredicted the branch target.
• % of cycles lost due to branch misprediction or exception/interruption flush
Percentage of cycles lost due to either an exception/interruption or a branch misprediction
flush.
branch Measurement Report Metrics
See Table 10 (page 174).
In this table, “program object” refers to any of the following:
• Thread
• Load module
• Function
• Source statement
• Instruction bundle
• Instruction
Table 10 Information in branch Measurement Reports
DescriptionColumn
Percent of the total for <metric> attributable to a given program object. The <metric> is the
same as the <metric> HP Caliper uses for sorting, except when the sort metric is address, in
which case sampled branch mispredicts is used.
% Total <metric>
Running sum of the percent of total for <metric> accounted for by the given program object and
those listed above it.
Cumulat % of Total
Number of times the given program object was recorded in BTB/ETB samples to be the target
of a branch.
Target of Branch
For the given program object, the number of times, in BTB/ETB samples, of branch sources in
the object, whether the branch was taken or not-taken (fall-through case).
Sampled Branch
Ways
For the given program object, the number of occurrences, in BTB/ETB samples, of branch
instructions whose outcome was mispredicted (whether due to a direction (taken/not-taken)
misprediction or a target misprediction). This column includes all mispredictions, whether due
to the processor Front End or Back End.
Branch Mispr Count
For the given program object, the percentage of branch captured in branch trace buffer
(BTB)/execution trace buffer (ETB) samples whose outcome was mispredicted.
% Branch Mispr
For the given program object, the number of occurrences, in BTB/ETB samples, of branch
instructions whose outcome was mispredicted only due to a Back End misprediction (in other
words, the processor Front End prediction was correct but the Back End predicted incorrectly).
This count is a subset of the Branch Mispr Count column.
BE-only Mispr Count
For the given program object, the percentage of branch captured in BTB/ETB samples whose
outcome was mispredicted only due to Back End mispredictions.
% BE- only Mispr
Kernel Thread ID suffixed with the the name of the routine that the thread will execute once it is
created.
Kernel Thread
Identification
Number
174 Descriptions of Measurement Reports