[Bug libfortran/127893] [14/15/16/17 regression] Severe libgfortran parallel-I/O performance regression on macOS since r14-6425

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=127893

Jerry DeLisle <jvdelisle at gcc dot gnu.org> changed:

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--- Comment #9 from Jerry DeLisle <jvdelisle at gcc dot gnu.org> ---
Created attachment 66049
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=66049&action=edit
A test patch

Try this patch and see if it helps. It basically is moving the lock out of the
hot path.