Linux内存使用率

Question

My web application server is using a lot of memory but not using the full 4GB of memory. It's saying that there is only 130 free. Which doesn't make sense since 955 is used. The application framework is Laravel and uses Redis for it's sessions.

Any idea why it won't use the total amount?

Answer 1

2.8G are used as buff/cache . this means they are used by the kernel as buffers and file system caches, and will be released to user processes if needed.

See this answer for more details: https://serverfault.com/questions/85470/meaning-of-the-buffers-cache-line-in-the-output-of-free