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When processing a parallel loop, save some context switching by processing one chunk on the calling thread

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Peter Thoman
2013-05-03 14:27:34 +02:00
parent 3edfc6ac1c
commit 5835fe293a
1 changed files with 6 additions and 3 deletions
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thread/threadpool.cpp
+6 -3
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@@ -64,10 +64,13 @@ void ThreadPool::ParallelLoop(function<void(int,int)> loop, int lower, int upper
// could do slightly better load balancing for the generic case,
// but doesn't matter since all our loops are power of 2
int chunk = range/numThreads;
for(int s=lower, i=0; i<numThreads; s+=chunk, ++i) {
workers[i]->Process(bind(loop, s, std::min(s+chunk,upper)));
int s = lower;
for(int i=0; i<numThreads-1; ++i) {
workers[i]->Process(bind(loop, s, s+chunk));
s+=chunk;
}
for(int i=0; i<numThreads; ++i) {
loop(s, upper);
for(int i=0; i<numThreads-1; ++i) {
workers[i]->WaitForCompletion();
}
} else {