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

[Junchao Zhang]

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> 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>
> *Date: *Monday, August 19, 2024 at 10:04 PM
> *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?
>
> 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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> *This Message Is From an External Sender *
>
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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> 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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