Difference between revisions of "OpenMP in Small Bites/Tasking"
OpenMP in Small Bites/Tasking
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== Quiz == | == Quiz == | ||
+ | {{hidden begin | ||
+ | |title = 1. What is the default data scoping of a variable in a task scope? Hint: Assume that the variable is declared before the task region, but in the same function. | ||
+ | }} | ||
+ | <quiz display=simple> | ||
+ | { | ||
+ | |type="()"} | ||
+ | - Always <code>firstprivate</code>. | ||
+ | || Wrong. | ||
+ | + <code>firstprivate</code> unless shared in the enclosing context. | ||
+ | || Correct. | ||
+ | - <code>shared</code> unless fristprivate in the enclosing context. | ||
+ | || Correct. | ||
+ | </quiz> | ||
+ | {{hidden end}} | ||
+ | |||
+ | {{hidden begin | ||
+ | |title = 2. Which tasks are synchronized with by a <code>taskyield</code> construct? | ||
+ | }} | ||
+ | <quiz display=simple> | ||
+ | { | ||
+ | |type="()"} | ||
+ | - All tasks of the same thread team. | ||
+ | || | ||
+ | - All desendant tasks. | ||
+ | || | ||
+ | + The direct child tasks. | ||
+ | || | ||
+ | </quiz> | ||
+ | {{hidden end}} | ||
+ | |||
+ | {{hidden begin | ||
+ | |title = 3. Why can it be benficial for the performance to use cut-off strategies for task-based OpenMP programs? | ||
+ | }} | ||
+ | <quiz display=simple> | ||
+ | { | ||
+ | |type="()"} | ||
+ | + It can avoid overhead caused by too fine-grained tasks. | ||
+ | || Correct. | ||
+ | - It can synchonize tasks faster. | ||
+ | || Wrong. | ||
+ | - It can accelerate task stealing be enforcing one task queue per thread. | ||
+ | || Wrong. | ||
+ | </quiz> | ||
+ | {{hidden end}} |
Revision as of 18:00, 30 November 2020
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 |
Video
Quiz
1. What is the default data scoping of a variable in a task scope? Hint: Assume that the variable is declared before the task region, but in the same function.
2. Which tasks are synchronized with by a
taskyield
construct?
3. Why can it be benficial for the performance to use cut-off strategies for task-based OpenMP programs?