[petsc-users] Would Mac OS version affect PETSc/C/C++ performance?

[Zou, Ling]

Junchao, I am accessing a pre-compiled version of PETSc via MOOSE, so unfortunately, I don’t have those configure log files.
Note that all function calls became slower.
-Ling

From: Junchao Zhang <junchao.zhang at gmail.com>
Date: Thursday, August 22, 2024 at 9:28 AM
To: Zou, Ling <lzou at anl.gov>
Cc: petsc-users at mcs.anl.gov <petsc-users at mcs.anl.gov>
Subject: Re: [petsc-users] Would Mac OS version affect PETSc/C/C++ performance?
Hi, Ling, MatMult almost degraded 20%, which is a lot. Do you have configure. log for the two builds? We might find compiler discrepancies from it. --Junchao Zhang On Wed, Aug 21, 2024 at 8: 57 AM Zou, Ling <lzou@ anl. gov> wrote: Hi Junchao,
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Hi, Ling,
   MatMult almost degraded 20%, which is a lot.   Do you have configure.log for the two builds?   We might find compiler discrepancies from it.

--Junchao Zhang


On Wed, Aug 21, 2024 at 8:57 AM Zou, Ling <lzou at anl.gov<mailto:lzou at anl.gov>> wrote:
Hi Junchao,

Yeah, I have part of the log_view, for the same code, same version of PETSc (3.20), but two OS (Ventura vs. Sonoma).
Note that PETSc function call numbers are exactly the same.
I suspect that it’s just OS becomes slower, or maybe something related to the compiler.

-Ling

# of calls
Time spent (Ventura)
Time spent (Sonoma)
MatMult MF
20463
3.718600E+00
4.467800E+00
MatMult
20463
3.721000E+00
4.470500E+00
MatFDColorApply
2062
4.507000E+00
5.394600E+00
MatFDColorFunc
24744
4.472400E+00
5.356300E+00
KSPSolve
2062
3.569700E+00
4.262400E+00
SNESSolve
986
9.195900E+00
1.102000E+01
SNESFunctionEval
23575
4.268600E+00
5.161100E+00
SNESJacobianEval
2062
4.509300E+00
5.397500E+00


From: Junchao Zhang <junchao.zhang at gmail.com<mailto:junchao.zhang at gmail.com>>
Date: Monday, August 19, 2024 at 10:04 PM
To: Zou, Ling <lzou at anl.gov<mailto:lzou at anl.gov>>
Cc: petsc-users at mcs.anl.gov<mailto:petsc-users at mcs.anl.gov> <petsc-users at mcs.anl.gov<mailto:petsc-users at mcs.anl.gov>>
Subject: Re: [petsc-users] Would Mac OS version affect PETSc/C/C++ performance?
Do you have -log_view report so that we can know which petsc functions degraded? Or is it because compilers were different? --Junchao Zhang On Sun, Aug 18, 2024 at 6: 04 PM Zou, Ling via petsc-users <petsc-users@ mcs. anl. gov> wrote: Hi
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Do you have -log_view report so that we can know which petsc functions degraded?  Or is it because compilers were different?

--Junchao Zhang


On Sun, Aug 18, 2024 at 6:04 PM Zou, Ling via petsc-users <petsc-users at mcs.anl.gov<mailto:petsc-users at mcs.anl.gov>> wrote:
Hi all,

After updating Mac OS from Ventura to Sonoma, I am seeing my PETSc code having slightly-larger-than 10% of performance degradation (only in terms of execution time).
I track the number of major function calls, they are identical between the two OS (so PETSc is not the one to blame), but just slower.
Is this something expected, any one also experienced it?

-Ling
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