c++ - Calculating used memory by a set of processes on Linux -

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i'm having trouble calculating used memory (resident) set of processes.

the issue came user set of processes share memory between themselves, simple addition of used memory ends nonsense number (>60gb when machine has 48gb memory).

is there simple way approach problem?

i can approximation. take (res mem - shared mem) * num proc + shared mem. not processes share same memory block.

i'm looking posix or linux solution problem c/c++.

you want iterate through each processes /proc/[pid]/smaps

it contain entry each vm mapping of likes:

7ffffffe7000-7ffffffff000 rw-p 00000000 00:00 0                          [stack] size:                100 kb rss:                  20 kb pss:                  20 kb shared_clean:          0 kb shared_dirty:          0 kb private_clean:         0 kb private_dirty:        20 kb referenced:           20 kb anonymous:            20 kb anonhugepages:         0 kb swap:                  0 kb kernelpagesize:        4 kb mmupagesize:           4 kb

private_dirty memory interested in.

if have pss field in smaps file amount of resident memory divided amount of processes share physical memory.

private_clean copy-on-write mappings. commonly used shared libraries , read/no-write/execute.


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