Well, I can give you a real-world example. Because I haven't yet found
an OS which has useful mmapping semantics for /dev/zero (namely that I
can open /dev/zero and pass a FD to another process and both processes
can mmap() the FD and share data via the mmapped region), I end up
creating a tmpfile in /tmp for mmapping purposes. Under Linux, this is
at least 16 MBytes (because under 16 MBytes I can use ordinary SysV
SHM). This tmpfile doesn't need to be saved to disc (not when you have
gobs of RAM).
So here is a real case where large files with a moderate lifetime (at
least a few minutes) are created in /tmp.
Regards,
Richard....
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