How to -r -c

[LiMuxing666]

Dear SuperLU Team,

Hello!

I have encountered some issues while using SuperLU_DIST and would appreciate your assistance.

When using the command "mpiexec -n 8 pddrive myrhs mymatrix", I obtain solutions with very small residuals. However, when I use "mpiexec -n 8 pddrive -r 2 -c 4 myrhs mymatrix", the residuals become significantly larger. I tried using the -i 1 and -i 2 options, but they did not improve the situation.
Additionally, I am working with matrices that have up to 10 million rows. In this context, should I use the -DXSDK_INDEX_SIZE=64 option?

Thank you for your assistance.

Best regards,

[Muxing Li]

[xiaoyeli]

If it succeeds with 1 MPI 32-bit indexing, you don't need 64 bit for multiple MPIs.
Can you compile a version with more printings, by defining:
-DCMAKE_C_FLAGS="-DPRNTlevel=1"

Then, you can send us the output file.

[LiMuxing666]

I apologize for the late reply. Unfortunately, I have not been engaged in this kind of work recently. Thank you very much for your advice and help