tree 8d3c084a766d9121ea5217cc81967095af8efc9d
parent 4fcba3a76049f9948adcc325bfbbe2a8c30ff4c2
author Nigel Tao <nigeltao@golang.org> 1562373446 +1000
committer Nigel Tao <nigeltao@golang.org> 1562376365 +1000

Add io_writer.history_available method

Also change copy_n_from_history to examine the buffer start instead of
the buffer mark.

name                                             old speed     new speed     delta

wuffs_deflate_decode_1k_full_init/clang5         151MB/s ± 0%  134MB/s ± 1%  -11.11%  (p=0.000 n=10+10)
wuffs_deflate_decode_1k_part_init/clang5         187MB/s ± 0%  162MB/s ± 1%  -13.11%  (p=0.000 n=10+10)
wuffs_deflate_decode_10k_full_init/clang5        241MB/s ± 0%  220MB/s ± 0%   -8.76%  (p=0.000 n=10+10)
wuffs_deflate_decode_10k_part_init/clang5        248MB/s ± 0%  225MB/s ± 0%   -9.12%  (p=0.000 n=10+9)
wuffs_deflate_decode_100k_just_one_read/clang5   288MB/s ± 0%  270MB/s ± 0%   -6.16%  (p=0.000 n=10+10)
wuffs_deflate_decode_100k_many_big_reads/clang5  239MB/s ± 0%  225MB/s ± 0%   -5.84%  (p=0.000 n=10+10)

wuffs_deflate_decode_1k_full_init/gcc7           153MB/s ± 1%  151MB/s ± 1%   -1.13%  (p=0.000 n=10+9)
wuffs_deflate_decode_1k_part_init/gcc7           187MB/s ± 1%  186MB/s ± 1%     ~     (p=0.052 n=10+10)
wuffs_deflate_decode_10k_full_init/gcc7          261MB/s ± 0%  256MB/s ± 1%   -1.83%  (p=0.000 n=10+10)
wuffs_deflate_decode_10k_part_init/gcc7          269MB/s ± 1%  264MB/s ± 1%   -1.62%  (p=0.000 n=10+10)
wuffs_deflate_decode_100k_just_one_read/gcc7     313MB/s ± 0%  310MB/s ± 1%   -0.69%  (p=0.000 n=9+10)
wuffs_deflate_decode_100k_many_big_reads/gcc7    247MB/s ± 0%  247MB/s ± 0%     ~     (p=0.089 n=10+10)