Open MP question

Hello

It's all right, just a question out of curiosity:

using

#pragma omp for

before a for loop specifies that the iterations of the associated loop will be executed in parallel.

My question: suppose I have a loop with 10000 iterations and two threads will be generated; thread, will be calculated first iterations 5000 while the second begins at 5000 index, it will work on odd/even clues or it is random, or...

Thank you!

Hello

If you do not specify a schedule using the schedule clause, the default value is the static calendar, where the iterations of the loop are divided in almost equal sizes between threads. So in your example, a thread will execute the iterations of the loop 0 - 4999 and the second thread will run iterations 5000 and 9999.  You can still see thread that runs that iteration by something like this:

#omp parallel for
for (int i = 0; i < 10000; i++)
   printf ("Iteration %d executed by thread %d", i, omp_get_thread_num())

An identifier, is attributed to each thread in the parallel region with the "master" thread having the id 0. This value is returned by omp_get_thread_num(). In the case above, the 'chunk' size is 5000.  You can change this by specifying the schedule (static, chuncksize) clause:

#omp parallel for schedule (static, 1000)
for (int i = 0; i < 10000; i++)
   printf ("Iteration %d executed by thread %d", i, omp_get_thread_num())

Here, each thread will run 1000 iterations of the loop, and then pick up the 'segment' available after 1000 iterations, and so forth until loop all of the iteations are executed.

You can also specify dynamic and guided schedules that are useful when the iterations of the loop are not load balanced. See section 2.5.1 features of OpenMP 2.5 for more details.

Tags: NI Software

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