Linux add swap partition, set swap threshold value

Swap threshold Value Setting

1. Check the current system swap threshold [email protected]~$ CAT/PROC/SYS/VM/SWAPPINESS60 memory when used to 100-60=40%, the use of switched partitions begins to appear swappiness= 0 indicates the maximum use of physical memory before using swap space, swappiness=100 indicates active use of the swap partition, and the memory of the data in a timely manner into the swap space 2, permanent settings [email protected]~$ sudo-s[[ Email protected] chunli]# echo "vm.swappiness = ten" >>/etc/sysctl.conf #永久修改 [email protected]~$ sudo sysctl-p[e Mail protected]~$ cat/proc/sys/vm/swappiness103, temporary settings [email protected]~$ sudo sysctl vm.swappiness=10 #临时修改

Create a Swap partition file

[email protected]~$ dd if=/dev/zero of=swapfile bs=1m count=4096[email  Protected]~$ mkswap swapfile enable swap partition [Email protected]~$ sudo swapon swapfile[email  protected]~$ free -mt              total       used       free      shared    buffers     cachedMem:            497         490          6           0         19         247-/+ buffers/cache:        224         272Swap:         6111           0       6111Total:         6609        490        6118 closing the swap partition [email protected]~$ sudo swapoff swapfile [email protected]~$  free -m             total        used       free      shared    buffers     cachedMem:            497        488           8          0          19        247-/+ buffers/cache:         221        275Swap:          2015           0       2015 permanent settings, boot automatic mountvim /etc/fstab /swapfile                swap                     swap     defaults        0 0

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Linux add swap partition, set swap threshold value