Hi Matthew, Thanks for your response! Does CHKERRQ work for FORTRAN-90? I linked my program with debug version of Petsc lib and got more error messages as attached below. I only used 8 processes, but the message said a big number, as well as a huge memory size, which must be wrong since the problem size is not very big. Does this mean the non-zero sizes passed to the subroutine are not correct? Thanks,Qin ==== error messages ===== [2]PETSC ERROR: --------------------- Error Message --------------------------------------------------------------
[2]PETSC ERROR: Out of memory. This could be due to allocating [2]PETSC ERROR: too large an object or bleeding by not properly [2]PETSC ERROR: destroying unneeded objects. [2]PETSC ERROR: Memory allocated 0 Memory used by process 2049617920 [2]PETSC ERROR: Try running with -malloc_dump or -malloc_view for info. [2]PETSC ERROR: Memory requested 18446744073458206720 [2]PETSC ERROR: See https://www.mcs.anl.gov/petsc/documentation/faq.html for trouble shooting. [2]PETSC ERROR: Petsc Release Version 3.12.5, Mar, 29, 2020 Sent from Yahoo Mail for iPhone On Thursday, January 14, 2021, 2:30 PM, Matthew Knepley <[email protected]> wrote: On Thu, Jan 14, 2021 at 11:58 AM Qin Lu via petsc-users <[email protected]> wrote: Hello, My program got error 55 from calling MatMPIAIJSetPreallocation with Petsc version 3.12.5, what does this error mean? Interestingly, the same program using an older version 3.4.2 works fine. I did make necessary interface change in my program when I upgraded to 3.12.5. 1) You should always call CHKERRQ(ierr) after a Petsc call. Then you will get the full error message and stack to send in. 2) Your error code is here: https://gitlab.com/petsc/petsc/-/blob/v3.12.5/include/petscerror.h#L17 3) It is a memory error. You asked for more memory than your machine could allocate. Thanks, Matt Thanks in advance for your help. Regards,Qin -- What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead. -- Norbert Wiener https://www.cse.buffalo.edu/~knepley/
