[Bug 2030797] [NEW] Parallel C++ algorithms run sequentially

[Gonzalo]

Public bug reported:

Parallel C++ algorithms run sequentially when C++20 iterators are used
with libstdc++, causing significant performance degradation on multicore
systems (10-100x) when run on Ubuntu Linux.

Patch to GCC available here:
https://gcc.gnu.org/pipermail/libstdc++/2023-July/056266.html

** Affects: gcc-13 (Ubuntu)
     Importance: Undecided
         Status: New

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Title:
  Parallel C++ algorithms run sequentially

Status in gcc-13 package in Ubuntu:
  New

Bug description:
  Parallel C++ algorithms run sequentially when C++20 iterators are used
  with libstdc++, causing significant performance degradation on
  multicore systems (10-100x) when run on Ubuntu Linux.

  Patch to GCC available here:
  https://gcc.gnu.org/pipermail/libstdc++/2023-July/056266.html

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