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I have a little issue that I can't understand.

I have 8x128GB sticks of RAM, which makes 1024GB of RAM.

But the command htop displays 996G and not 1024G as expected.

You can see the following illustration below :

htop image

How to interpret this result ?

UPDATE: This is a strange result since on my MacOS Macbook, I have officially 64GB of RAM and when I type the command htop, I get the following result :

htop macos image

As you can see, it displays all the amount of official memory, i.e 64GB of RAM unlike to Debian 10 Linux. I don't understand this difference.

Could anyone explain me the reason ?

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    I believe this value is the same as MemTotal from /proc/meminfo. According to man proc, MemTotal is "Total usable RAM (i.e., physical RAM minus a few reserved bits and the kernel binary code)". Commented Jul 23, 2021 at 1:34
  • @berndbausch . I don't understand the "RAM minus a few reserved bits and the kernel binary" : normally, it should display 8*128 GB, i.e the total quantity of sticks, shouldn't it ? Commented Jul 23, 2021 at 1:49
  • If I am right, it displays the amount of memory that you can use. That is your RAM minus a few reserved bits and the kernel. If you want the amount of installed memory, use a tool like dmidecode, which queries the BIOS. Note that your Mac doesn't run on Linux. Commented Jul 23, 2021 at 1:55
  • @berndbausch . Thanks, I am going to try. Did you see my UPDATE and the difference between MacOS and Debian ? Commented Jul 23, 2021 at 1:57
  • Yes. MacOS is based on a BSD UNIX (not sure which), whereas Linux isn't. Commented Jul 23, 2021 at 1:57

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