How can I detect false separation slowing performance?

Question

I am setting up a high-performance multi-threaded application, and I suspect that a false exchange may be the reason why performance is poor. How can I verify that this is so?

I am running C ++ on Ubuntu 12.04 using gcc 4.82.

Answer 1

I will post something that I just came across with C ++ Concurrency in action.

One way to check for a false exchange is to add huge blocks of indentation between data items that can be accessed by different threads at the same time.

struct protected_data
{
   std::mutex m;
   char padding[65536];
   my_data data_to_protect; 
}; 

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Answer 2

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