Notes swap mémoire

Voir :

• https://chrisdown.name/2018/01/02/in-defence-of-swap.html
• https://kubernetes.io/blog/2025/03/25/swap-linux-improvements/

Voir aussi :

• Swap sur ramdisk

systemctl --type swap
cat /proc/swaps
cat /proc/vmstat

echo 0 > /proc/sys/vm/swappiness
# cat /proc/sys/vm/vfs_cache_pressure
# sysctl -w vm.vfs_cache_pressure=50

# Allocate storage and restrict access
fallocate --length 4GiB /swapfile
chmod 600 /swapfile
 
# Format the swap space
mkswap /swapfile
 
# Activate the swap space for paging
swapon /swapfile

Consommation de la SWAP par utilisateur

smem -u -s swap

Consommation de la SWAP par process

smem -s swap

ou

echo -e "SWAP_KB\tPPID\tPID\tEXE"
 
for S_FILE in /proc/[0-9]*/ ; 
do 
  S_PPID="$(awk '/^PPid:/ { print $2}' ${S_FILE}/status)" ;
  S_PID="$(echo ${S_FILE}/status | cut -d'/' -f3)" ;  
  S_EXE="$(readlink $S_FILE/exe)" ; 
  S_SWAPKB="$(awk '/VmSwap/ { print $2}' ${S_FILE}/status)" ; 
  [ ! -z $S_SWAPKB ] && echo -e "$S_SWAPKB\t${S_PPID}\t${S_PID}\t${S_EXE}" ; 
done | sort -n

dphys-swapfile swapoff 

Source : https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/managing_storage_devices/getting-started-with-swap_managing-storage-devices