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.zh...@gmail.com> Date: Monday, August 19, 2024 at 10:04 PM To: Zou, Ling <l...@anl.gov> Cc: petsc-users@mcs.anl.gov <petsc-users@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 ZjQcmQRYFpfptBannerStart This Message Is From an External Sender This message came from outside your organization. ZjQcmQRYFpfptBannerEnd 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<mailto:petsc-users@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
