[petsc-users] Error occurred when version change

Zhang, Hong hzhang at mcs.anl.gov
Tue Dec 29 12:54:27 CST 2020

petsc-3.4<https://www.mcs.anl.gov/petsc/documentation/changes/34.html> - Public Release, May 13, 2013
i.e., it is a version released 7 years ago. Why you have to use such an old version?

From: petsc-users <petsc-users-bounces at mcs.anl.gov> on behalf of 朱昭霓 <zhuzhaoni2017 at hnu.edu.cn>
Sent: Tuesday, December 29, 2020 2:51 AM
To: petsc-users <petsc-users at mcs.anl.gov>
Subject: [petsc-users] Error occurred when version change

Dear Sir or Madam:

Hello, I am a new PETSc learner. There are some confusions when I using different versions of PETSc. For some reasons, I have to change my codes from the version 3.6.3 to 3.4.5. Newton methods in 3.6.3 version converged successfully with the time step size dt=100. While with the same dt=100 and almost the same codes, Newton methods in version 3.4.5 failed to converge. The debug test indicated that there may be something wrong during the line search process. I have tried to search the changes in different versions but failed. Could you please give me some suggestions? Thank you so much.

Best regards,

Zhaoni Zhu
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