Getting of peak rss memory on Linux

[giampaolo]

From grds...@gmail.com on May 21, 2013 14:28:45

Now get_ext_memory_info() on Windows returns peak working set but doesn't 
return peak rss on Linux.

It is possible to get peak rss on Linux reading VmHWM field from 
/proc/pid/status.

Original issue: http://code.google.com/p/psutil/issues/detail?id=383

[tijko]

On Linux systems this could be exposed under /proc/$PID/status in the VmHWM entry. Just as simply as, adding an extra field under pmem tuple and using a re.compile with _read_status_file.

[NotSqrt]

Or a separate method, something like this, in _pslinux:

    @wrap_exceptions
    def peak_rss(self, _hwm_re=re.compile(br'VmHWM:\s+(\d+)\s+kB')):
        # Returns Peak resident set size in bytes
        data = self._read_status_file()
        val, = _hwm_re.findall(data)[0]
        return int(val) * 1024