IBM GC28-1982-02 manual 188

buffer .

A portion of storage used

to hold

inputcommunicationor

and US (user space) as a message

output

data

temporarily.

passing interface

that

is optimized for

performance

the switch. SeeInternetalso

ProtocolandUser Space.

C

communicator

. An

MPI

object

that describes

the

C .

communication

context

and

an

associated group

of

A

general purpose programming

language.

It was

processes.

formalized by ANSI standards committee for the C

language in

1984 and

by Uniforum

in

1983.

compile .

To

translate a source program into an

C++ .

executable

program.

A general purpose programming language,

based

on

C,

which

includes

extensions that

support

an

condition . One of a set of specified values that

object-oriented programming paradigm.

Extensions item

can

assume.

include:

Ÿ

strong typing

control

workstation

.

A

workstation attached

to

the

Ÿdata abstraction and encapsulationIBM RS/6000 SP SP that serves as a single point of

Ÿpolymorphism through function overloading and control allowing the administrator or operator to monito and manage the system using Parallel System Support

templates

Programs.

Ÿ class inheritance.

call

arc .

The

representation

of

a

call

core

dump

.

A

process

by

which

the

current

state

o

between

two

functions

within

the

Xprofiler

function

call

program is preserved in a file. Core dumps are usua

tree. It

appears

as

a

solid

line

between

the

two

associated with programs that have encountered an

functions. The

arrowhead indicates

the

direction

of

the

unexpected, system-detected fault, such as a

call; the

function

it

points

to is

the

one

that

Segmentation Fault, or severe user error. The current

receives

the

call.

The

function

making

the

call

is

known calleras,

wthile

program state is needed for the programmer to

diagnose

and

correct

the

problem.

the

function receiving

the call

is calleeknown.

as

the

chaotic

relaxation

.

An

iterative

relaxation

core

file .

A

file

which

preserves

the

state

of

a

method

is

terminated

which

uses

a

combination

of

the

Gauss-Seidel

program, usually just before a program

and

error.

coreSee

alsodump.

an

unexpected

Jacobi-Seidel methods. The array of discrete values is

divided

into

sub-regions

which

can

be

operated

on in

When

using either

of

the

PE

parallel

parallel.

The

sub-region

boundaries

are

current

context .

calculated using

Jacobi-Seidel,

whereas

the

sub-region

debuggers, control of the parallel program and the

interiors

are

calculated

using

Gauss-Seidel. GaussSee

-alsoSeidel.

display of its data can be limited to a subset o

tasks

that

belong

to

that

program.

This

subset

of

ta

client

.

A

function

that

requests

services

is

called currentthe

context. You

can

set

the

current

from

a server,

a

single

task,

multiple

tasks,

or

all

t

and

makes

them available

to

the

user.

context

to

be

tasks

in

the

program.

cluster .

A

group

of

processors

interconnected

through

a high speed network that

can

be

used

forD

high-performance computing. It typically provides

excellent

price/performance.

data

decomposition

.

A

method

of

breaking

up

(or

collective

communication

.

A

communication

decomposing)

a

program

into

smaller

parts

to

exploit

parallelism. One divides the program by dividing the

operation

which

involves

more

than

two

processes

or

(usually

arrays)

into

smaller

parts

and

operating

tasks. Broadcasts,

reductions,

and

the

data

MPI_Allreduce

independently.

each

part

subroutine are all examples of collective communication

operations.

All

tasks

in

a

communicator

must

data

parallelism .

Refers

to

situations

where

parallel

participate.

tasks

perform

the

same

computation

on

different

sets

command

alias

.

When

using

the PE command line data.

debugger,

pdbx,

you

can

create

abbreviations

for

existing

commands

using pdbxthealias

command.

dbx

. A symbolic command line debugger that is often

provided

with

UNIX

systems. The PE

command

line

These

abbreviations

are commandknow asaliases.

debugger,pdbx , is based dbxon thedbugger.

Communication

Subsystem

(CSS)

.

A

component

of

debugger

.

A debugger

provides

an

environment

in

the

Parallel

System

Support

Programs

that

provides

you

can

manually

control

the

execution

of

a

software

support

for

the

SP

Switch.

CSS

which

provides

two

protocols:

IP

(Internet

Protocol)

for

program. It also provides the ability to display th

LAN-based

data

and operation.

program's

188

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PE

for

AIX

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