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On a AMD Ryzen 7 3700X system:
$ timeout 10 taskset 1 ./src/cat-prev /dev/zero \
| taskset 2 pv -r > /dev/null
[1.67GiB/s]
$ timeout 10 taskset 1 ./src/cat /dev/zero \
| taskset 2 pv -r > /dev/null
[9.03GiB/s]
On a Power10 system:
$ taskset 1 ./src/yes | timeout 10 taskset 2 ./src/cat-prev \
| taskset 3 pv -r > /dev/null
[12.9GiB/s]
$ taskset 1 ./src/yes | timeout 10 taskset 2 ./src/cat \
| taskset 3 pv -r > /dev/null
[81.8GiB/s]
* NEWS: Mention the improvement.
* src/cat.c: Include isapipe.h, splice.h, and unistd--.h.
(splice_cat): New function.
(main): Use it.
* src/local.mk (noinst_HEADERS): Add src/splice.h.
* src/splice.h: New file, based on definitions from src/yes.c.
* src/yes.c: Include splice.h.
(pipe_splice_size): Use increase_pipe_size from src/splice.h.
(SPLICE_PIPE_SIZE): Remove definition, moved to src/splice.h.
* tests/cat/splice.sh: New file, based on some tests in
tests/misc/yes.sh.
* tests/local.mk (all_tests): Add the new test.
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