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Attached is a screenshot from htop command. I am wondering why the Mem bar is like 50% full when only 4.1GB out of 126GB is used. Are the Mem bar and the 4.1GB figures representing something different? enter image description here

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See the htop faq: http://hisham.hm/htop/index.php?page=faq

The memory meter in htop says a low number, such as 9%, when top shows something like 90%! (Or: the MEM% number is low, but the bar looks almost full. What's going on?)

The number showed by the memory meter is the total memory used by processes. The additional available memory is used by the Linux kernel for buffering and disk cache, so in total almost the entire memory is in use by the kernel. I believe the number displayed by htop is a more meaningful metric of resources used: the number corresponds to the green bars; the blue and brown bars correspond to buffers and cache, respectively (as explained in the Help screen accessible through the F1 key). Numeric data about these is also available when configuring the memory meter to display as text (in the Setup screen, F2).

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