[petsc-users] Memory usage

[Karthikeyan Chockalingam - STFC UKRI]

Hello,

I used the flags  -memory_view -malloc_log   to ran a problem on the same size on 32 cores and 64 cores.

I understand what is total, max and min memory usage of the problem is. However I don’t understand the difference between Maximum and Current process memory?

I also curious to understand why the memory usage is different on 32 cores (1 node, 2 sockets with 16 cores/socket) and 64 cores (2 nodes) for a problem of the same size?

On 32 core:

Summary of Memory Usage in PETSc
Maximum (over computational time) process memory:        total 7.5014e+10 max 2.6396e+09 min 2.0659e+09
Current process memory:                                                      total 3.2583e+10 max 1.3562e+09 min 8.3587e+08

On 64 core:

Summary of Memory Usage in PETSc
Maximum (over computational time) process memory:        total 7.9337e+10 max 1.5433e+09 min 1.0319e+09
Current process memory:                                                      total 6.4491e+10 max 1.2090e+09 min 8.4000e+08

Kind regards,
Karthik.

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