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On wikipedia, it says that tmpfs is stored on volatile memory rather than persistent storage device. I have done some experiments and come across contradict.

enter image description here （My computer environment-->Mac OS/X parallel Ubuntu 16.04 x64 ） Type

free -m

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I do not know what "shared" mean. Type

man free

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Does that mean the "shared" column shows what is Shmem in /proc/meminfo? Keeping typing

vim /proc/meminfo

give back

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It does mean part of tmpfs on ram.

But I type

df -lh

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That means part of tmpfs on disk.

I feel confused! Can someone tell me how tmpfs is implemented (on Linux)? Is it on disk or ram on earth? Or neither.

HannanKan
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1 Answers1

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tmpfs is a temporary file system that uses volatile memory, like RAM. Please take a look at the manual page: http://man7.org/linux/man-pages/man5/tmpfs.5.html

Krassi Em
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