On 26.04.2014, Garry T. Williams wrote:
> That's not true. Swap will come into play and unreferenced data in
> the /tmp files will be paged out in favor of claiming that memory for
> other uses.
Did you actually try?
[htd@kiera ~]$ dd if=/dev/zero of=/tmp/bigfile bs=1M count=3000
dd: error writing ‘/tmp/bigfile’: No space left on device
2048+0 records in
2047+0 records out
2147450880 bytes (2.1 GB) copied, 0.920556 s, 2.3 GB/s
[htd@kiera ~]$ free -m
total used free shared buffers cached
Mem: 3745 1562 2183 0 0 773
-/+ buffers/cache: 787 2957
Swap: 8191 0 8191
I have 4 GB of memory in my machine, and mount defaults to "size=50%"
(= 2GB). I have been running /tmp as a tmpfs a long time, because the
harddisk is a SSD. What happens can you see above: it creates a 2 GB
file and aborts for the next 1 GB. The machine has 8 GB of swap, and
nothing of it was used.
Disclaimer: this is not a rant against having /tmp using tmpfs. I'm
aware of the limitations, and have only encountered positive
experiences so far.
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