TotalView Users Guide - CI Wiki

MULTITASK: In the context of high performance computing, this is the ability
to divide a program into smaller pieces or tasks that execute separately.
MULTI-PROCESS: The ability of a program to spawn off separate programs,
each having its own context and memory. multi-process programs can (and
most often do) run processes on more than one computer. They can also
run multiple processes an one computer. In this case, memory can be
shared
MULTI-THREADED: The ability of a program to spawn off separate tasks that
use the same memory. Switching from task to task is controlled by the
operating system.
MUTEX (MUTUAL EXCLUSION): Techniques for sharing resources so that different
users do not conflict and cause unwanted interactions.
NATIVE DEBUGGING: The action of debugging a program that is running on
the same machine as TotalView.
NESTED DIVE: TotalView lets you dive into pointers, structures, or arrays in a
variable. When you dive into one of these elements, TotalView updates the
display so that the new element appears. A nested dive is a dive within a
dive. You can return to the previous display by selecting the left arrow in
the top-right corner of the window.
NODE: A machine on a network. Each machine has a unique network name
and address.
OFF-BY-ONE: An error usually caused by forgetting that arrays begin with
element 0 in C and C++.
OPENMP: (from a definition on the OpenMP web site) OpenMP is a specification
for a set of compiler directives, library routines, and environment
variables that can be used to specify shared memory parallelism in Fortran
and C/C++ programs. The MP in OpenMP stands for Multi Processing. We
provide Open specifications for Multi Processing via collaborative work
with interested parties from the hardware and software industry, government
and academia. For more information, see http://www.openmp.org/.
OUT-OF-SCOPE: When symbol lookup is performed for a particular symbol
name and it isn’t found in the current scope or any that contains scopes,
the symbol is said to be out-of-scope.
PAGE PROTECTION: The ability to segregate memory pages so that one process
cannot access pages owned by another process. It can also be used
to generate an exception when a process tries to access the page.
PARALLEL PROGRAM: A program whose execution involves multiple threads
and processes.
PARALLEL TASKS: Tasks whose computations are independent of each
other, so that all such tasks can be performed simultaneously with correct
results.
PARALLELIZABLE PROBLEM: A problem that can be divided into parallel
tasks. This type of program might require changes in the code and/or the
underlying algorithm.
404 Glossary