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Optimized the non blocking thread pool:

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* Use a pseudo-random permutation of queue indices during random stealing. This ensures that all the queues are considered.
 * Directly pop from a non-empty queue when we are waiting for work,
instead of first noticing that there is a non-empty queue and
then doing another round of random stealing to re-discover the non-empty
queue.
 * Steal only 1 task from a remote queue instead of half of tasks.
This commit is contained in:
Benoit Steiner
2016-05-09 10:17:17 -07:00
parent 05c365fb16
commit dc7dbc2df7
3 changed files with 96 additions and 64 deletions
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8
unsupported/test/cxx11_runqueue.cpp
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@@ -100,6 +100,14 @@ void test_basic_runqueue()
// Empty again.
VERIFY(q.Empty());
VERIFY_IS_EQUAL(0u, q.Size());
VERIFY_IS_EQUAL(0, q.PushFront(1));
VERIFY_IS_EQUAL(0, q.PushFront(2));
VERIFY_IS_EQUAL(0, q.PushFront(3));
VERIFY_IS_EQUAL(1, q.PopBack());
VERIFY_IS_EQUAL(2, q.PopBack());
VERIFY_IS_EQUAL(3, q.PopBack());
VERIFY(q.Empty());
VERIFY_IS_EQUAL(0, q.Size());
}
// Empty tests that the queue is not claimed to be empty when is is in fact not.