v4.1.x: Powerpc atomics: Force usage of powerpc assembly.#8708
Merged
rajachan merged 1 commit intoopen-mpi:v4.1.xfrom Mar 29, 2021
Merged
v4.1.x: Powerpc atomics: Force usage of powerpc assembly.#8708rajachan merged 1 commit intoopen-mpi:v4.1.xfrom
rajachan merged 1 commit intoopen-mpi:v4.1.xfrom
Conversation
The builtins used by default on Power have been shown to perform poorly. For the time being, force all compilers to use the inline assembly until atomic builtins catch-up. This changes the defaults for all compilers sans xl, including: gcc, clang, and pgi to use the assembly. Previously, all of the above were using C11 or the gcc builtins. Bonus: Add a configure flag to force Power machines to use the builtins/C11, depending on what is available. This will make future testing easier. Signed-off-by: Austen Lauria <awlauria@us.ibm.com> (cherry picked from commit e3f3c5b)
jjhursey
approved these changes
Mar 26, 2021
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
3 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
The builtins used by default on Power have been
shown to perform poorly. For the time being, force
all compilers to use the inline assembly until
atomic builtins catch-up.
This changes the defaults for all compilers sans xl, including:
gcc, clang, and pgi to use the assembly.
Previously, all of the above were using C11 or
the gcc builtins.
Bonus:
Add a configure flag to force Power machines to use
the builtins/C11, depending on what is available. This
will make future testing easier.
Signed-off-by: Austen Lauria awlauria@us.ibm.com
(cherry picked from commit e3f3c5b)