HP UX Caliper Software manual Branch Measurement Report Metrics

•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

Column	Description
% Total <metric>	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.
Cumulat % of Total	Running sum of the percent of total for <metric> accounted for by the given program object and
	those listed above it.
Target of Branch	Number of times the given program object was recorded in BTB/ETB samples to be the target
	of a branch.
Sampled Branch	For the given program object, the number of times, in BTB/ETB samples, of branch sources in
Ways	the object, whether the branch was taken or not-taken (fall-through case).
Branch Mispr Count	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	For the given program object, the percentage of branch captured in branch trace buffer
	(BTB)/execution trace buffer (ETB) samples whose outcome was mispredicted.
BE-only Mispr Count	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	For the given program object, the percentage of branch captured in BTB/ETB samples whose
	outcome was mispredicted only due to Back End mispredictions.
Kernel Thread	Kernel Thread ID suffixed with the the name of the routine that the thread will execute once it is
Identification	created.
Number

174 Descriptions of Measurement Reports