Swap: Difference between revisions
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To return swap to ram. | To return swap to ram. | ||
swapoff -a; swapon -a | swapoff -a; swapon -a | ||
(swapoff -a; swapon -a) & watch free -m | |||
See swappiness value. | See swappiness value. | ||
cat /proc/sys/vm/swappiness | cat /proc/sys/vm/swappiness | ||
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sudo sysctl vm.swappiness=0 | sudo sysctl vm.swappiness=0 | ||
sort processes on swap usage. | sort processes on swap usage. | ||
<pre> | |||
for PROCESS in /proc/*/; do swapused=$(awk 'BEGIN { total = 0 } /^Swap:[[:blank:]]*[1-9]/ { total = total + $2 } END { print total }' ${PROCESS}/smaps 2>/dev/null || echo 0); if [ $swapused -gt 0 ]; then /bin/echo -e "${swapused}k\t$(cat ${PROCESS}/cmdline)"; fi; done | sort -nr | |||
</pre> | |||
=add swap on existing disk= | |||
dd if=/dev/zero of=swapfile bs=1M count=10000 | |||
mkswap swapfile | |||
swapon swapfile | |||
Latest revision as of 10:58, 13 March 2024
How to handle swappiness
Start top and press O then p to sort by swap.
top -c
Look to see if any swap is being used. si and so is swap in and swap out.
vmstat 1
To return swap to ram.
swapoff -a; swapon -a (swapoff -a; swapon -a) & watch free -m
See swappiness value.
cat /proc/sys/vm/swappiness
To set swippiness value.
sudo sysctl vm.swappiness=0
sort processes on swap usage.
for PROCESS in /proc/*/; do swapused=$(awk 'BEGIN { total = 0 } /^Swap:[[:blank:]]*[1-9]/ { total = total + $2 } END { print total }' ${PROCESS}/smaps 2>/dev/null || echo 0); if [ $swapused -gt 0 ]; then /bin/echo -e "${swapused}k\t$(cat ${PROCESS}/cmdline)"; fi; done | sort -nr
add swap on existing disk
dd if=/dev/zero of=swapfile bs=1M count=10000 mkswap swapfile swapon swapfile