[petsc-users] GAMG memory consumption

[Karthikeyan Chockalingam - STFC UKRI]

Hello,

I would like to understand why more memory is consumed by -pc_type gamg compared to -pc_type mg for the same problem size

ksp/ksp/tutorial: ./ex45 -da_grid_x 368 -da_grid_x 368 -da_grid_x 368 -ksp_type cg

-pc_type mg

Maximum (over computational time) process memory:        total 1.9399e+10 max 9.7000e+09 min 9.6992e+09

-pc_type gamg

Maximum (over computational time) process memory:        total 4.9671e+10 max 2.4836e+10 min 2.4835e+10

Am I right in understanding that the memory limiting factor is ‘max 2.4836e+10’ as it is the maximum memory used at any given time?
I have attached the -log_view output of both the preconditioners.

Best regards,
Karthik.


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