What's the best way to return values from parallel_for

Asked Oct 03 '16 at 16:15

Active Oct 03 '16 at 19:20

Viewed 261 times

I have simple parallel_for loop and results of every iteration I am inserting to concurrent_unordered_map. I see that inserting makes my code much slower. So what is the best way to return pairs from parallel_for to unordered_map? I was trying with Critical_section but it was much slower. I was trying to use combinable, but I haven't idea how to do it with map.

Pseudocode:

concurrent_unordered_map<type, type> my_map;

parallel_for(0, max, [](int i){
  //is a lot of work happening
  my_map.insert(std::pair<type, type>(a, b); //here is bottleneck!!
}, static::partitioner());

edited Oct 03 '16 at 19:20

yuri kilochek

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asked Oct 03 '16 at 16:15

Queen

xy-problem? why do you need a map? – BeyelerStudios Oct 03 '16 at 19:35
I found how to do it with Vector, so problem solved. But I am all time interested what is the best way to return anything from parallel_for :) – Queen Oct 04 '16 at 10:23

What's the best way to return values from parallel_for

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