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[PROBLEM] No custom memory allocator for msg can be provided #4125
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            mjvankampen
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    by completely removing malloc/free from the hot path of benchmark util
…pool # Conflicts: # src/msg.cpp # src/msg.hpp # src/zmq.cpp
In practice I observed that 256 byte messages require +- 1024 messages pre-allocated to reach max. performance on my pc. This scales depending on message size I believe.
Consider switch to range based for (only since C++11 though)
Changed some options that should not have changed
Cpp equivalent of malloc/free
  
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This PR is a preamble to #3911 but I think that one got a bit big. I would like to discuss the API first.