I am using watch -n 5 free -m command via terminal to watch the memory fluctuate as I run virtual box with a guest that is limited to 4GB of RAM(it allocates 4GB on start of virtual guest).
Under USED its showing 3 diffirent figures: Mem: 7984 (example) -+ buffer/cache: 4811 Swamp: 0
What is -+ buffer/cache?
The reason I ask is because before I run Virtualbox I'm using about 800mb. I told Virtualbox to use 4GB. So in my mind -+buffer/cache is using the memory allocated to VirtualBox +system used memory. However I don't understand Mem: So am I using close to 8GB? Could someone clarify the outputs to this command?