linux/amd64 Go 1.7.3 vs Go tip

benchstat.txt

name                     old time/op    new time/op    delta
BinaryTree17-8              2.58s ± 1%     2.59s ± 0%     ~     (p=0.310 n=5+5)
Fannkuch11-8                2.91s ± 0%     2.85s ± 0%   -1.87%  (p=0.004 n=5+6)
FmtFprintfEmpty-8          48.8ns ± 0%    47.4ns ± 0%   -2.87%  (p=0.010 n=6+4)
FmtFprintfString-8          134ns ± 1%     119ns ± 1%  -11.28%  (p=0.002 n=6+6)
FmtFprintfInt-8             125ns ± 0%     112ns ± 2%  -10.40%  (p=0.004 n=5+6)
FmtFprintfIntInt-8          189ns ± 1%     171ns ± 1%   -9.86%  (p=0.002 n=6+6)
FmtFprintfPrefixedInt-8     187ns ± 1%     178ns ± 1%   -4.55%  (p=0.002 n=6+6)
FmtFprintfFloat-8           270ns ± 0%     262ns ± 1%   -3.15%  (p=0.004 n=5+6)
FmtManyArgs-8               803ns ± 1%     734ns ± 0%   -8.56%  (p=0.000 n=6+5)
GobDecode-8                7.15ms ± 0%    6.63ms ± 1%   -7.26%  (p=0.002 n=6+6)
GobEncode-8                6.02ms ± 0%    5.71ms ± 2%   -5.06%  (p=0.002 n=6+6)
Gzip-8                      224ms ± 0%     223ms ± 0%     ~     (p=0.065 n=6+6)
Gunzip-8                   35.9ms ± 0%    35.8ms ± 2%     ~     (p=0.394 n=6+6)
HTTPClientServer-8         67.3µs ± 1%    66.1µs ± 2%   -1.74%  (p=0.004 n=6+6)
JSONEncode-8               17.0ms ± 0%    15.3ms ± 1%  -10.05%  (p=0.004 n=5+6)
JSONDecode-8               47.1ms ± 0%    50.2ms ± 1%   +6.57%  (p=0.002 n=6+6)
Mandelbrot200-8            4.53ms ± 1%    4.07ms ± 0%  -10.18%  (p=0.004 n=6+5)
GoParse-8                  3.34ms ± 1%    3.15ms ± 1%   -5.75%  (p=0.002 n=6+6)
RegexpMatchEasy0_32-8      78.7ns ± 2%    81.4ns ± 5%   +3.43%  (p=0.013 n=6+6)
RegexpMatchEasy0_1K-8       189ns ± 1%     189ns ± 0%     ~     (p=0.636 n=6+6)
RegexpMatchEasy1_32-8      83.1ns ± 2%    74.9ns ± 0%   -9.84%  (p=0.004 n=6+5)
RegexpMatchEasy1_1K-8       346ns ± 0%     329ns ± 0%   -4.91%  (p=0.000 n=5+4)
RegexpMatchMedium_32-8      125ns ± 0%     115ns ± 0%   -8.00%  (p=0.002 n=6+6)
RegexpMatchMedium_1K-8     36.1µs ± 1%    35.6µs ± 1%   -1.39%  (p=0.002 n=6+6)
RegexpMatchHard_32-8       1.81µs ± 0%    1.79µs ± 0%   -1.31%  (p=0.002 n=6+6)
RegexpMatchHard_1K-8       54.4µs ± 1%    54.0µs ± 0%   -0.64%  (p=0.004 n=6+5)
Revcomp-8                   446ms ± 1%     397ms ± 1%  -11.11%  (p=0.002 n=6+6)
Template-8                 55.0ms ± 1%    53.0ms ± 2%   -3.69%  (p=0.002 n=6+6)
TimeParse-8                 305ns ± 0%     288ns ± 2%   -5.31%  (p=0.002 n=6+6)
TimeFormat-8                328ns ± 1%     302ns ± 0%   -7.94%  (p=0.002 n=6+6)

name                     old speed      new speed      delta
GobDecode-8               107MB/s ± 0%   116MB/s ± 1%   +7.83%  (p=0.002 n=6+6)
GobEncode-8               128MB/s ± 0%   134MB/s ± 2%   +5.34%  (p=0.002 n=6+6)
Gzip-8                   86.5MB/s ± 0%  86.9MB/s ± 0%     ~     (p=0.058 n=6+6)
Gunzip-8                  541MB/s ± 0%   542MB/s ± 2%     ~     (p=0.394 n=6+6)
JSONEncode-8              114MB/s ± 0%   127MB/s ± 1%  +11.18%  (p=0.004 n=5+6)
JSONDecode-8             41.2MB/s ± 0%  38.7MB/s ± 1%   -6.17%  (p=0.002 n=6+6)
GoParse-8                17.3MB/s ± 1%  18.4MB/s ± 1%   +6.12%  (p=0.002 n=6+6)
RegexpMatchEasy0_32-8     407MB/s ± 2%   393MB/s ± 5%   -3.24%  (p=0.015 n=6+6)
RegexpMatchEasy0_1K-8    5.40GB/s ± 1%  5.40GB/s ± 0%     ~     (p=1.000 n=6+6)
RegexpMatchEasy1_32-8     385MB/s ± 2%   427MB/s ± 0%  +10.87%  (p=0.004 n=6+5)
RegexpMatchEasy1_1K-8    2.96GB/s ± 0%  3.11GB/s ± 0%   +5.13%  (p=0.004 n=6+5)
RegexpMatchMedium_32-8   7.96MB/s ± 0%  8.66MB/s ± 0%   +8.79%  (p=0.002 n=6+6)
RegexpMatchMedium_1K-8   28.3MB/s ± 1%  28.7MB/s ± 1%   +1.41%  (p=0.002 n=6+6)
RegexpMatchHard_32-8     17.7MB/s ± 0%  17.9MB/s ± 0%   +1.30%  (p=0.002 n=6+6)
RegexpMatchHard_1K-8     18.8MB/s ± 1%  19.0MB/s ± 0%   +0.62%  (p=0.004 n=6+5)
Revcomp-8                 570MB/s ± 1%   641MB/s ± 1%  +12.50%  (p=0.002 n=6+6)
Template-8               35.3MB/s ± 1%  36.6MB/s ± 2%   +3.84%  (p=0.002 n=6+6)