CODEWITHSUNDEEP
c++openmp
sara nj
sara nj

Reputation: 207

Nested paralleled regions OpenMP

What does it mean in OpenMP that

Nested parallel regions are serialized by default

Does it mean threads do it continuously? I also can not underestend this part:

A throw executed inside a parallel region must cause execution to resume within
the dynamic extent of the same structured block, and it must be caught by the
same thread that threw the exception.

Upvotes: 2

Views: 909

Answers (1)

Mattenii
Mattenii

Reputation: 329

As explained here (scroll down to "17.1 Nested parallelism", by default a nested parallel region will not be parallelized, thus run sequentially. Nested thread creation is possible using either OMP_NESTED=true (as environment variable) or omp_set_nested(1) (in your code).

EDIT: also see this answer to a similar question.

Upvotes: 2

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