[petsc-users] Compiling with PETSc 64-bit indices

[TAY wee-beng]

Hi,

When I run my CFD code with a grid size of 1119x1119x499 ( total grid 
size =    624828339 ), I got the error saying I need to compile PETSc 
with 64-bit indices.

So I tried to compile PETSc again and then compile my CFD code with the 
newly compiled PETSc. However, now I got segmentation error:

rm: cannot remove `log': No such file or directory
[409]PETSC ERROR: 
------------------------------------------------------------------------
[409]PETSC ERROR: [535]PETSC ERROR: [410]PETSC ERROR: 
------------------------------------------------------------------------
[410]PETSC ERROR: Caught signal number 11 SEGV: Segmentation Violation, 
probably memory access out of range
[410]PETSC ERROR: Try option -start_in_debugger or -on_error_attach_debugger
[410]PETSC ERROR: [536]PETSC ERROR: 
------------------------------------------------------------------------
[536]PETSC ERROR: Caught signal number 11 SEGV: Segmentation Violation, 
probably memory access out of range
[536]PETSC ERROR: Try option -start_in_debugger or -on_error_attach_debugger
[536]PETSC ERROR: or see 
http://www.mcs.anl.gov/petsc/documentation/faq.html#valgrind
[536]PETSC ERROR: or try http://valgrind.org on GNU/linux and Apple Mac 
OS X to find memory corruption errors
[536]PETSC ERROR: likely location of problem given in stack below
[536]PETSC ERROR: ---------------------  Stack Frames 
------------------------------------
[536]PETSC ERROR: Note: The EXACT line numbers in the stack are not 
available,
[536]PETSC ERROR:       INSTEAD the line number of the start of the function
[536]PETSC ERROR:       is given.
[536]PETSC ERROR: [536] DMDACheckOwnershipRanges_Private line 581 
/home/users/nus/tsltaywb/source/petsc-3.7.6/src/dm/impls/da/da.c
[536]PETSC ERROR: or see 
http://www.mcs.anl.gov/petsc/documentation/faq.html#valgrind
[410]PETSC ERROR: or try http://valgrind.org on GNU/linux and Apple Mac 
OS X to find memory corruption errors
[410]PETSC ERROR: likely location of problem given in stack below
[410]PETSC ERROR: ---------------------  Stack Frames 
------------------------------------
[410]PETSC ERROR: Note: The EXACT line numbers in the stack are not 
available,
[897]PETSC ERROR: [536] DMDASetOwnershipRanges line 613 
/home/users/nus/tsltaywb/source/petsc-3.7.6/src/dm/impls/da/da.c
[536]PETSC ERROR: [536] DMDACreate3d line 1434 
/home/users/nus/tsltaywb/source/petsc-3.7.6/src/dm/impls/da/da3.c
[536]PETSC ERROR: --------------------- Error Message 
--------------------------------------------------------------

The CFD code worked previously but increasing the problem size results 
in segmentation error. It seems to be related to DMDACreate3d and 
DMDASetOwnershipRanges. Any idea where the problem lies?

Besides, I want to know when and why do I have to use PETSc with 64-bit 
indices?

Also, can I use the 64-bit indices version with smaller sized problems?

And is there a speed difference between using the 32-bit and 64-bit 
indices ver?

-- 
Thank you very much.

Yours sincerely,

================================================
TAY Wee-Beng (Zheng Weiming) 郑伟明
Personal research webpage: http://tayweebeng.wixsite.com/website
Youtube research showcase: https://www.youtube.com/channel/UC72ZHtvQNMpNs2uRTSToiLA
linkedin: www.linkedin.com/in/tay-weebeng
================================================