Swap usage Linux scripts and commands

To see SWAP usage by processes script:

#!/bin/sh

# Get current swap usage for all running processes

# Erik Ljungstrom 27/05/2011

SUM=0

OVERALL=0

for DIR in `find /proc/ -maxdepth 1 -type d | egrep “^/proc/[0-9]”` ; do

PID=`echo $DIR | cut -d / -f 3`

PROGNAME=`ps -p $PID -o comm –no-headers`

for SWAP in `grep Swap $DIR/smaps 2>/dev/null| awk ‘{ print $2 }’`

do

let SUM=$SUM+$SWAP

done

echo “PID=$PID – Swap used: $SUM – ($PROGNAME )”

let OVERALL=$OVERALL+$SUM

SUM=0

done

echo “Overall swap used: $OVERALL”

./getswap.sh | egrep -v “Swap used: 0” |sort -n -k 5

To see free memory and swap space:

free -hm

Top command to calculate swap usage:

top

(SWAP = VIRT – RES)