how to get Heap size of a program

Question

How to find heap memory size of a c++ program under linux platform ?I need heap memory space before the usage of new or malloc and also after that.can anyone help?

Answer 1

On Linux you can read /proc/[pid]/statm to get memory usage information.

Provides information about memory usage, measured in pages. The columns are:

              size       total program size
                         (same as VmSize in /proc/[pid]/status)
              resident   resident set size
                         (same as VmRSS in /proc/[pid]/status)
              share      shared pages (from shared mappings)
              text       text (code)
              lib        library (unused in Linux 2.6)
              data       data + stack
              dt         dirty pages (unused in Linux 2.6)

See the man page for more details.

Answer by Adam Zalcman to this question describes some interesting details of the heap allocation