Worksharing (OpenMP)

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OpenMP in Small Bites/Worksharing
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Tutorial
Title: OpenMP in Small Bites
Provider: HPC.NRW

Contact: tutorials@hpc.nrw
Type: Multi-part video
Topic Area: Programming Paradigms
License: CC-BY-SA
Syllabus

1. Overview
2. Worksharing
3. Data Scoping
4. False Sharing
5. Tasking
6. Tasking and Data Scoping
7. Tasking and Synchronization
8. Loops and Tasks
10. Task Scheduling
11. Non-Uniform Memory Access

Contents

This video shows the concept of OpenMP worksharing, loop scheduling and synchronization mechanisms. After this tutorial session the programmer already has knowledge about the most common used OpenMP constructs and API functions. How the scoping of data is controlled is introduced in the part on Data Scoping.

Video

( Slides as pdf)

Quiz

1. What is most commonly used worksharing construct in OpenMP to distribute work among loop interations?

Click and submit to see the answer

2. Give an example for a parallel vector addition using OpenMP worksharing!

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3. Can the following code snipped be parallelized with the OpenMP for-construct with out breaking the semantic? Justify your answer.
int i, int s = 0;
for (i = 1; i < 100; i++){
s = a[i-1] + a[i];
}

Click and submit to see the answer