https://mp.weixin.qq.com/mp/wappoc_appmsgcaptcha?poc_token=HPdP52mjhA0XI6jLdqYNPDAkpd2WU1sbLBKM0srW&target_url=https%3A%2F%2Fmp.weixin.qq.com%2Fs%2Fb_3HCn88xe0TLMNwxsM4dg

实际就是linux上的内存压缩技术

sudo apt update
sudo apt install zram-tools
cat /etc/default/zramswap
sudo systemctl restart zramswap

查看使用情况：

zramctl
NAME ALGORITHM DISKSIZE DATA COMPR TOTAL STREAMS MOUNTPOINT
/dev/zram0 lzo-rle 7.7G 1.2G 497.3M 522.9M [SWAP]