•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