September 2008
Intermediate to advanced
280 pages
6h 31m
English
Content preview from The Art of Debugging with GDB, DDD, and Eclipse
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Extended Example
This section presents an example of debugging a shared-memory application developed using OpenMP. The necessary knowledge of OpenMP will be explained below. All that is needed is a basic understanding of threads.
OpenMP Overview
OpenMP is essentially a higher-level parallel programming interface to thread-management operations. The number of threads is set via the environment variable OMP_NUM_THREADS. In the C shell, for instance, you type
% setenv OMP_NUM_THREADS 4
at the shell prompt to arrange to have four threads.
Application code consists of C interspersed with OpenMP directives. Each directive applies to the block that follows it, delimited by left and right braces. The most basic directive is
#pragma omp parallel
This ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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