HP UX Caliper Software How Data TLB Metrics Are Obtained, Function Source statement Instruction

•Function

•Source statement

•Instruction

Table 22 Information in dtlb 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 misses is used.
Cumulat % of	Running sum of the percent of total for <metric> accounted for by the given program object and
Total	those listed above it.
Sampled DTLB	Total number of sampled data TLB misses attributed to the given program object.
Misses
DTLB L2 Fills	Number of sampled data TLB misses that hit the L2 data TLB for the given program object.
DTLB HPW Fills	Number of sampled data TLB misses that were handled by the hardware page walker (HPW) for
	the given program object.
DTLB Soft Fills	Number of sampled data TLB misses that were handled by software for the given program object.
% DTLB L2 Fill	Percent of sampled data TLB misses that hit the L2 data TLB for the given program object.
% DTLB HPW Fill	Percent of sampled data TLB misses that were handled by the hardware page table walker (HPW)
	for the given program object.
% DTLB Soft Fill	Percent of sampled data TLB misses that were handled by software for the given program object.
Kernel Thread	Kernel Thread ID suffixed with the the name of the routine that the thread will execute once it is
Identification	created.
Number.
Load Module	Shared library or the main executable.
Function	Routine from your application.
File	Source file associated with a function.
Line	The column contains one of these:
Slot	• A source-code line number for rows showing statements
Col,Offset
	• An instruction slot number for rows showing instructions not on a bundle boundary
	• A source-code column number followed by an offset from the beginning address of a function
	for rows showing instructions on a bundle boundary
	Column and line numbers are preceded by “~” when they are approximate due to optimization.
>Statement	The column contains either a source statement, preceded by “>”, or a disassembled instruction.
Instruction	Statements that are out of order due to optimization are preceded by “*>”.

How Data TLB Metrics Are Obtained

HP Caliper obtains L1 data TLB metrics from the processor's performance monitoring unit (PMU).

Exact counts are obtained from the PMU's set of performance monitor configuration (PMC)/performance monitor data (PMD) register pairs. Sampled data TLB metrics are obtained from the PMU's data event address register (D-EAR).

HP Caliper takes samples every Nth data TLB miss, where N is defined in the dtlb measurement configuration file in the HP Caliper home directory config subdirectory. At each sample point, HP Caliper records both the instruction that resulted in an L1 data TLB miss and the level of the TLB

196 Descriptions of Measurement Reports