procmemstat - Show total and average memory usage of processes

procmemstat

#! /bin/sh

# procmemstat - Show total and average memory usage of processes
# Copyright (C) 2012 Matous J. Fialka, <http://mjf.cz/>
# Released under the terms of The MIT License

# Note: This is just a quick dirty hack...

#
# Check and parse arguments 
#
if [ $# -lt 1 ]
then
	printf -- 'Usage: procmemstat [procname1 procname2 .. procnameN]\n'
	exit 0
fi

#
# Print header
#
printf -- ' %-14s\t % 7s\t % 7s\t%-32s\n' PROCESS TOTAL AVERAGE REMARK

#
# For every given process do print memory total and average usage
#
for _PROCESS in $@
do
	ps -ylC "$_PROCESS" |

	awk -vPROCESS="$_PROCESS" '
	{
		x += $8
		y += 1
	}

	END {
		z = 0
		if((y - 1) < 1) {
			y = 2
			z = 1
		}
		printf "%-15s\t%7.1fM\t%7.1fM", PROCESS, x/1024, x/((y-1)*1024)
		if(z)
			printf "\tno such process"
		printf "\n"
	}
	'
done |

#
# Print summary
#
awk '
{
	print
	sub(/M$/, nil, $2)
	sub(/M$/, nil, $3)
	x += $2
	y += $3
}
END {
	printf "\n\t\t%7.1fM\t%7.1fM\tTOTAL\n", x, y
}
'

Use it as follows:

$ procmemstat apache2 mysqld postgres postfix
 PROCESS           TOTAL         AVERAGE        REMARK                          
apache2          3386.9M           49.8M
mysqld            704.1M          704.1M
postgres           14.9M            3.0M
postfix             0.0M            0.0M        no such process

                 4105.9M          756.9M        TOTAL

Very useful when calculating Apache2 performance tunning parameters.

Note 1: To get rid of the header line, use:

$ procmemstat apache2 mysqld postgres postfix | sed 1d

Note 2: To get rid of the total line, use:

$ procmemstat apache2 mysqld postgres postfix | head -n -2