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

hot spot An instruction or set of instructions that has a higher execution count than most other instructions
in a program.
HP Caliper Advisor A rules-based expert system that gives guidance about improving the performance of an
application. See “Using the HP Caliper Advisor” (p. 76).
HP Caliper option A parameter in the HP Caliper command line used to customize the performance analysis. See
“HP Caliper Options” (p. 47).
HyperThreading A feature of the dual-core Itanium 2 and Itanium 9300 quad-core processor that provides the
ability for a processor to create an additional logical processor that might allow additional
efficiencies of processing. A dual-core Itanium 2 processor with HyperThreading active provides
four logical processors, two on each core. An Itanium 9300 quad-core processor with
HyperThreading active provides eight logical processors. This allows the operating system to
schedule two threads or processes simultaneously. HyperThreading is formally called
Hyper-Threading Technology.
icache
measurement
A measurement, provided by the icache measurement configuration file, that measures and
reports instruction cache misses.
icache_miss
measurement
The non-preferred name for the icache measurement. This name was used in releases prior to
Release 3.9.
index value In the HP Caliper Advisor, a number representing the approximate importance of a particular
piece of advice. See “Using the HP Caliper Advisor” (p. 76).
instruction bundle In the Integrity servers processor family, a group of three instructions packed into 16 bytes. Also
known as bundle.
instruction
dispersal
The process of mapping instructions within bundles to functional units. See “dispersal Event Set”
(p. 227).
instruction event
address register
(I-EAR)
The component of the Integrity servers processor that records the instruction addresses of data
cache misses for loads, the instruction addresses of data TLB misses, and the instruction addresses
of instruction TLB and cache misses.
See also data event address register (D-EAR).
instruction pointer
(IP)
In the Integrity servers processor family, a register that indicates where the computer is in its
instruction sequence.
instruction slot An arrangement of instructions. In the Integrity servers processor family, each instruction bundle
is composed of three instruction slots, numbered 0, 1, and 2. Also known as slot.
Integrity servers
processor family
A collection of HP processors using the Itanium 2 architecture. These processors include the
following processors: Itanium 2, Itanium 2 6M, Itanium 2 9M, low-voltage Itanium 2, dual-core
Itanium 2, and Itanium 9300 quad-core processor. Report output from HP Caliper specifies
whether the output refers to the Itanium 2, Itanium 2 6M, Itanium 2 9M, low-voltage Itanium 2,
dual-core Itanium 2, or Itanium 9300 quad-core processor.
IP-EAR Instruction pointer address capture. This is a feature in dual-core Itanium 2 and Itanium 9300
quad-core processors that is intended to facilitate the correlation of performance monitoring events
to instruction pointers.
itlb measurement A measurement, provided by the itlb measurement configuration file, that measures and reports
instruction translation lookaside buffer (TLB) misses.
itlb_miss
measurement
The non-preferred name for the itlb measurement. This name was used in releases prior to
Release 3.9.
latency bucket A grouping of latency data associated with data accesses serviced by particular levels of CPU
cache and system memory. The dcache measurement provides latency bucket information.
leaf routine A routine that is a leaf in the call graph of a program (that is, a routine that calls no other routines).
measurement An activity performed by HP Caliper to quantify the performance of an application. Each run of
HP Caliper uses a particular measurement, which you can specify in the command line. A
measurement is actually the name of a measurement configuration file that contains parameter
settings for the measurement to be made. See “HP Caliper Measurement Configuration Files”
(p. 42).
255