Tricks to reduce memory usage in Proxmox Virtual Environment (PVE).

ReduceMemoryUsage4PVEHost.md

let VM(linux) flush the memory cache

switch to root user, and add an interval task into crontab in linux VM:

0 */3 * * * /bin/sh -c 'echo 1 > /proc/sys/vm/drop_caches'

controls the tendency of the kernel to swap out memory pages to the swap

echo "vm.swappiness=70" >> /etc/sysctl.conf