Change #262009

Comments

tac: avoid unnecessary standard output buffering
This has removes a tiny amount of overhead:

    $ seq 10000000 > input
    $ perf stat -e cpu-clock --repeat 1000 taskset 1 ./src/tac \
        input 2>&1 > /dev/null | grep -F 'seconds time'
              0.095707 +- 0.000223 seconds time elapsed  ( +-  0.23% )
    $ perf stat -e cpu-clock --repeat 1000 taskset 1 ./src/tac-prev \
        input 2>&1 > /dev/null | grep -F 'seconds time'
             0.1009378 +- 0.0000995 seconds time elapsed  ( +-  0.10% )

* src/tac.c (output): Use full_write instead of fread since we already
buffer the output ourselves.

Changed files

• src/tac.c