[Bug libgomp/108494] Slow thread creation with nested loops in GFortran

[rguenth at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108494

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Version|unknown                     |12.2.1
           Keywords|                            |openmp

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed with GCC 12.  perf shows

Samples: 9M of event 'cycles', Event count (approx.): 563584363996              
Overhead       Samples  Command  Shared Object       Symbol                     
  48.21%       4487732  a.out    libgomp.so.1.0.0    [.] omp_get_num_procs
   4.17%         25651  a.out    [unknown]           [k] 0xffffffff9aba2a94
   2.15%         13393  a.out    [unknown]           [k] 0xffffffff9ab9f8c7
   1.18%          7245  a.out    [unknown]           [k] 0xffffffff9b0389f2