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# Linux 释放缓存空间
Linux 下释放 cache 空间命令如下：
```bash
# 在释放缓存前应该先
sync
# 手动释放内存
echo 3 > /proc/sys/vm/drop_caches
# 查看内存是否已经释放
free -h
```
drop_caches 的值可以是 0-3 之间的数字，代表不同的含义：
- 0：不释放（系统默认值）
- 1：释放页缓存
- 2：释放dentries和inodes
- 3：释放所有缓存