The method I was using was essentially

	grep VmRSS /proc/$pid/status

Comparing these two methods, I get

Your method (PSS):
	2408313
My method (RSS):
	VmRSS:	 2410396 kB

On Oct 21, 2015, at 12:29 AM, Tom Zander <tomz@freedommail.ch> wrote:

> On Tuesday 20 Oct 2015 20:01:16 Jonathan Toomim wrote:
> Please make sure you measure your memory usage correctly on Linux, it is
> notoriously easy to get misleading info from tools like top.
> 
> I use this one on Linux.
> 
> $cat ~/bin/showmemusage
> #!/bin/sh
> if test -z "$1"; then
>    echo "need a pid"
>    exit
> fi
> 
> mem=`echo 0 $(cat /proc/$1/smaps | grep Pss | awk '{print $2}' | \
> sed 's#^#+#' ) | bc`
> echo "$mem KB"