GNU bug report logs - #77404
[PATCH 0/1] PETSc compiler optimization: Pass from -O1 to -O3

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Luca Cirrottola <luca.cirrottola <at> inria.fr>
To: guix-patches <at> gnu.org
Cc: Luca Cirrottola <luca.cirrottola <at> inria.fr>
Subject: [PATCH 0/1] PETSc compiler optimization: Pass from -O1 to -O3
Date: Mon, 31 Mar 2025 12:42:17 +0200

Hello Guix,

I have recently noticed that the "petsc" package raises the following warnings during the configuration phase, showing that the compiler only does O1 optimization for now:

=============================================================================================
                         Configuring PETSc to compile on your system
=============================================================================================
=============================================================================================
                                     ***** WARNING *****
  Using default C optimization flags "-g -O". You might consider manually setting optimal
  optimization flags for your system with COPTFLAGS="optimization flags" see
  config/examples/arch-*-opt.py for examples
=============================================================================================
=============================================================================================
                                     ***** WARNING *****
  Using default Cxx optimization flags "-g". You might consider manually setting optimal
  optimization flags for your system with CXXOPTFLAGS="optimization flags" see
  config/examples/arch-*-opt.py for examples
=============================================================================================
=============================================================================================
                                     ***** WARNING *****
  Using default FC optimization flags "-g -O". You might consider manually setting optimal
  optimization flags for your system with FOPTFLAGS="optimization flags" see
  config/examples/arch-*-opt.py for examples
=============================================================================================

So here is a patch that follows the hints and passes the "-g -O3" flags to the COPTFLAGS, CXXOPTFLAGS and FOPTFLAGS variables.
The package builds successfully on my machine. Some tests fail for both the packages "petsc" and "petsc-openmpi", but these were failing already with the "-O1" flag (so maybe this could be the topic of another issue).
I am looking forward for your review.

Cheers,
Luca

Luca Cirrottola (1):
  Activate higher compiler optimization for PETSc.

 gnu/packages/maths.scm | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)


base-commit: 4b97ae180fc13f7e4818cf48519f8a77c22c7797
-- 
2.34.1

Message #8 received at 77404 <at> debbugs.gnu.org (full text, mbox):

From: Luca Cirrottola <luca.cirrottola <at> inria.fr>
To: 77404 <at> debbugs.gnu.org
Cc: Luca Cirrottola <luca.cirrottola <at> inria.fr>
Subject: [PATCH 1/1] Activate higher compiler optimization for PETSc.
Date: Mon, 31 Mar 2025 12:44:35 +0200

---
 gnu/packages/maths.scm | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/gnu/packages/maths.scm b/gnu/packages/maths.scm
index 74c486b38a..fd0c940507 100644
--- a/gnu/packages/maths.scm
+++ b/gnu/packages/maths.scm
@@ -3658,7 +3658,10 @@ (define-public petsc
       #:test-target "test"
       #:parallel-build? #f             ; build is parallel by default
       #:configure-flags
-      #~(list "--with-mpi=0"
+      #~(list "COPTFLAGS=-g -O3"
+              "CXXOPTFLAGS=-g -O3"
+              "FOPTFLAGS=-g -O3"
+              "--with-mpi=0"
               "--with-openmp=1"
               "--with-openblas=1"
               (string-append "--with-openblas-dir="
-- 
2.34.1

Message #13 received at 77404-done <at> debbugs.gnu.org (full text, mbox):

From: Andreas Enge <andreas <at> enge.fr>
To: 77404-done <at> debbugs.gnu.org
Cc: Luca Cirrottola <luca.cirrottola <at> inria.fr>
Subject: Close
Date: Mon, 31 Mar 2025 16:06:42 +0200

Hello,

thanks for the patch! I have pushed it after adapting the commit message
to our coding standards.

Andreas

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