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I have a core dump file generated by a c++ program.
I suspect the reason it crashed is because it was running out of memory.
Is there a way the get the amount of memory in use from the core file using gdb (or any other way)?
According to this thread, it is not possible.
However, you can use
size -A coreto get the sizes of individual sections of the core dump (you won’t know what they are, though).