3 ms·

It depends on your setup. The default when no size is given is to use half the RAM.

• colejohnson66 9y ago
  Half? That seems kind of excessive. Are you sure that’s right?
  • Sidnicious 9y ago
    I would guess that it’s given that capacity, but the memory is allocated lazily.
    • yjftsjthsd-h 9y ago
      Correct; tmpfs only uses as much memory as as is used by the files it contains.