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 |
| application. See “Using the HP Caliper Advisor” (p. 77). |
HP Caliper option | A parameter in the HP Caliper command line used to customize the performance analysis. See |
| |
HyperThreading | A feature of the |
| ability for a processor to create an additional logical processor that might allow additional |
| efficiencies of processing. A |
| four logical processors, two on each core. An Itanium 9300 |
| HyperThreading active provides eight logical processors. This allows the operating system to |
| schedule two threads or processes simultaneously. HyperThreading is formally called |
| |
icache | A measurement, provided by the icache measurement configuration file, that measures and |
measurement | reports instruction cache misses. |
icache_miss | The |
measurement | 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. 77). |
instruction bundle | In the Integrity servers processor family, a group of three instructions packed into 16 bytes. Also |
| known as bundle. |
instruction | The process of mapping instructions within bundles to functional units. See “dispersal Event Set” |
dispersal | |
instruction event | The component of the Integrity servers processor that records the instruction addresses of data |
address register | 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 |
instruction pointer | In the Integrity servers processor family, a register that indicates where the computer is in its |
(IP) | 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 | A collection of HP processors using the Itanium 2 architecture. These processors include the |
processor family | following processors: Itanium 2, Itanium 2 6M, Itanium 2 9M, |
| Itanium 2, and Itanium 9300 |
| whether the output refers to the Itanium 2, Itanium 2 6M, Itanium 2 9M, |
| |
Instruction pointer address capture. This is a feature in | |
| |
| 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 | The |
measurement | 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” |
|
270 Glossary