CODEWITHSUNDEEP
c++multithreadingtbb
Weimin Chan
Weimin Chan

Reputation: 347

Chunk a map with Intel TBB parallel_for

I want to traverse my std::map in parallel with parallel_for.
As the tutorial says, we cannot randomly access it, so I chose parallel_for_each.

std::map<std::string, std::string> map_;  // student name, student age

tbb::parallel_for_each(map_.begin(), map_.end(), [&](const auto& item) {  
    processOne worker;
    worker(item.first, map_.size());
});

But it seems that parallel_for_each will not chunk the map into subtasks, so it is quite slow.

Is it possible to do something like this?

tbb::parallel_for(tbb::blocked_range<int>(0, map_.size(), 10000), [&](tbb::blocked_range<int> r) {
        ...
});

Upvotes: 1

Views: 90

Answers (0)

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