Re: [PATCH] cat: use splice if operating on non-files or if copy_file_range fails

[Pádraig Brady]

On 30/03/2026 00:13, Collin Funk wrote:

On a AMD Ryzen 7 3700X system:

     $ timeout 10 taskset 1 ./src/cat-prev /dev/zero \
         | taskset 2 pv -r > /dev/null
     [1.84GiB/s]
     $ timeout 10 taskset 1 ./src/cat /dev/zero \
         | taskset 2 pv -r > /dev/null
     [7.92GiB/s]

While a bit of an edge case, it really speeds up pipe to pipe:
For example if you wanted to skip the first 4K of input, you could:

$ src/yes | (dd bs=4096 count=1 of=/dev/null status=none; src/cat-prev) |
  pv -r >/dev/null
[2.37GiB/s]

$ src/yes | (dd bs=4096 count=1 of=/dev/null status=none; src/cat) |
  pv -r >/dev/null
[35.5GiB/s]

cheers,
Padraig