Then select the Memory tab, where you find every Real-time info on your Mac memory. Click the Apple menu tab located at the top left of your screen. You can also view the allocated memory usage of individual applications by clicking on Processes> Memory (Private Working Set). In the Performance tab, select “ Memory.” This displays the total amount of RAM installed, the amount of RAM currently in use, and the amount of RAM available. In the Task Manager tab, click on the “ Performance” tab. Press the “ Ctrl + Shift + Esc ” to open the Task Manager, or right-click the taskbar and choose task manager. If you need to find out how much RAM your computer has you can follow the guides on this page for Windows or Mac.To check how much of your RAM is being used by Minecraft per time, use these steps: Checking RAM Usage on Windows 
Note: Java 8 and over no longer has PermGen at all.
if you assign 2GB of RAM to MC and 256MB of PermGen that equals 2.25GB of RAM total.
If you've assigned PermGen this is added on-top of the RAM you assign to Minecraft. if Minecraft will run fine with 3GB of RAM don't allocate 6GB just because you can. You shouldn't assign more RAM than Minecraft actually needs to run smoothly. 
Typically the max will be 512MB to 1024MB less than your system's capacity. When selecting your maximum RAM to give to Minecraft it can only be the max of what your system can handle AFTER taking in to account how much memory your Operating System requires. You need to have a 64bit OS and 64bit Java to use more than 2GB of RAM. There are a few things to keep in mind before you start:
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