Difference between revisions of "OpenMP in Small Bites/Overview"
OpenMP in Small Bites/Overview
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| − | [[Category:Tutorials]] | + | [[Category:Tutorials]]<nowiki /> |
| − | {{Syllabus OpenMP in Small Bites}} | + | {{DISPLAYTITLE:OpenMP Overview}} |
| + | {{Syllabus OpenMP in Small Bites}}<nowiki /> | ||
__TOC__ | __TOC__ | ||
| + | |||
| + | This video provides a brief history of OpenMP and then introduces the parallel region, one of the most fundamental concepts of OpenMP, used to mark code regions that are meant to be processed by multiple threads in parallel. How the code region is processed and by which threads is then controlled by other OpenMP constructs introduced in the part on [[OpenMP in Small Bites/Worksharing | Worksharing]]. | ||
=== Video === <!--T:5--> | === Video === <!--T:5--> | ||
| − | <youtube width="600" height=" | + | <youtube width="600" height="340" right>NrgLrOxyLgU</youtube> |
| + | |||
| + | ([[Media:hpc.nrw_01_Introduction-Overview.pdf | Slides as pdf]]) | ||
=== Quiz === <!--T:5--> | === Quiz === <!--T:5--> | ||
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{{hidden begin | {{hidden begin | ||
| − | |title = 1. Out of which three components the OpenMP interface | + | |title = 1. Out of which three components does the OpenMP interface consist? |
}} | }} | ||
<quiz display=simple> | <quiz display=simple> | ||
{ | { | ||
|type="()"} | |type="()"} | ||
| − | + | + | + Compiler directives, runtime routines, environment variables |
| − | || compiler | + | || Correct |
| + | - Compiler directives, host language extensions, runtime routines | ||
| + | || While compiler support is needed, OpenMP does comprise host language extensions, yet also uses environment variables. | ||
| + | - Host language extensions, runtime routines, environment variables. | ||
| + | || OpenMP does not comprise host language extensions, but rather uses compiler directives to insert . | ||
</quiz> | </quiz> | ||
{{hidden end}} | {{hidden end}} | ||
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{ | { | ||
|type="()"} | |type="()"} | ||
| − | + | + | + Fork-Join |
| − | || | + | || An OpenMP program starts with just one worker thread (<code>master</code>). The <code>worker</code> threads are spawned in the parallel region and form a <code>team</code> of threads together with the <code>master</code>. They all join at the end of a parallel region. |
| + | - Create-Release | ||
| + | || An OpenMP program starts with just one worker thread (<code>master</code>). The <code>worker</code> threads are spawned in the parallel region and form a <code>team</code> of threads together with the <code>master</code>. They all join at the end of a parallel region. | ||
| + | - Start-Wait | ||
| + | || An OpenMP program starts with just one worker thread (<code>master</code>). The <code>worker</code> threads are spawned in the parallel region and form a <code>team</code> of threads together with the <code>master</code>. They all join at the end of a parallel region. | ||
</quiz> | </quiz> | ||
{{hidden end}} | {{hidden end}} | ||
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<quiz display=simple> | <quiz display=simple> | ||
{ | { | ||
| − | |type=" | + | |type="[]"} |
| − | + | + | + Set environment variable <code>OMP_NUM_THREADS</code>. |
| − | + | || True | |
| + | + Use <code>num_threads</code> clause on a parallel construct. | ||
| + | || True | ||
| + | - Number of threads are fixed at compile time | ||
| + | || False | ||
| + | - All of the above | ||
| + | || False | ||
</quiz> | </quiz> | ||
{{hidden end}} | {{hidden end}} | ||
Latest revision as of 09:58, 4 April 2022
| 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 | |
| 9. Tasking Example: Sudoku Solver | |
| 10. Task Scheduling | |
| 11. Non-Uniform Memory Access | |
This video provides a brief history of OpenMP and then introduces the parallel region, one of the most fundamental concepts of OpenMP, used to mark code regions that are meant to be processed by multiple threads in parallel. How the code region is processed and by which threads is then controlled by other OpenMP constructs introduced in the part on Worksharing.
Video