HP Caliper User's Guide

itlb Measurement Report Description
With the itlb measurement, produced by the itlb measurement configuration file,
HP Caliper measures and reports two levels of information:
• Exact counts of instruction translation lookaside buffer (TLB) metrics summed
across the entire run of an application
• Sampled instruction TLB metrics that are associated with particular locations in
the application
The report shows masured data by thread, load module, function, statement, and cache
line.
Command-line options allow you to control the amount of data reported, how the data
is sorted, and the number of statements and instructions reported for each sampled
program location.
Example Command Line for Text Report
$ caliper itlb -o reports/itlbm.txt ./matmul
Example Command Line for CSV Report
$ caliper itlb --csv csvout ./matmul
itlb Metrics Summed for Entire Run
This section describes the metrics summed over the entire run of your application under
HP Caliper.
Metrics for Integrity Servers Itanium 2 Systems
L1I_READS The number of data memory read references
issued into the memory pipeline that are serviced
by L1D (only integer loads), RSE loads, L1-hinted
loads (L1D returns data if it hits in L1D but does
not do a fill), and check loads (ld.c).
Non-cacheable reads, VHPT loads, semaphores,
floating-point loads, and lfetch instructions are
not counted here because L1D does not handle
these. The count includes wrong path operations
but excludes predicated off operations.
ITLB_MISSES_FETCH.L1ITLB Number of L1 instruction TLB misses for demand
fetch. Misses are counted even if the L1
instruction TLB is not updated for an access
(non-cacheable/nat page/not present
page/faulting/some flushed), it will be counted
here.
ITLB_MISSES_FETCH.L2ITLB Number of L1 instruction TLB misses that also
missed in the L2 instruction TLB.
Total L1 Instruction TLB References Total number of L1 instruction TLB references.
282 Descriptions of Measurement Reports