[Bug libstdc++/96942] std::pmr::monotonic_buffer_resource causes CPU cache misses

[dmitriy.ovdienko at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96942

--- Comment #26 from Dmitriy Ovdienko <dmitriy.ovdienko at gmail dot com> ---
Created attachment 49201
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=49201&action=edit
Modified solution (thread per iteration)

Attached is a code similar to what Rust sample is doing (parallel
iterations-loop rather than depth-loop).

What I'd like to improve is to reuse allocated memory rather than allocate
every iteration. 

According to requirements to the task, I cannot implement my own memory arena.
So I have to find way how to use STL to achieve same effect.