Darryl Gove's blog
OpenMP 3.0 specification released
The specification for OpenMP 3.0 has been put up on the OpenMP.org website. Using the previous OpenMP 2.5 standard, there's basically two supported modes of parallelisation:
- Splitting a loop over multiple threads - each thread is responsible for a range of the iterations.
- Splitting a serial code into sections - each thread executes a section of code.
The large change with OpenMP 3.0 is the introduction of tasks, where a thread can spawn a task to be completed by another thread at an unspecified point in the future. This should make OpenMP amenable to many more situations. An example of using tasks looks like:
node * p = head;
while (p)
{
#pragma omp task
{
process(p);
}
p = p->next;
}
The master thread iterates the linked list generating tasks for processing each element in the list. The brackets around the call to process(p) are unnecessary, but hopefully clarify what's happening.
Posted at 11:10AM May 13, 2008 by Darryl Gove in Sun |
