On Monday, 30 May 2016 at 20:08:46 UTC, Andrei Alexandrescu wrote:
On 05/30/2016 04:00 PM, Chris wrote:
./benchmark.dmd
std: 178 ±31 +36 (4475) -29 (5344)
manual: 167 ±46 +82 (2883) -32 (7054)
qznc: 114 ±7 +18 (1990) -5 (7288)
Chris: 228 ±49 +82 (3050) -35 (6780)
Andrei: 103 ±5 +47 ( 658) -2 (9295)
(avg slowdown vs fastest; absolute deviation)
CPU ID: GenuineIntel Intel(R) Core(TM) i5-4200U CPU @ 1.60GHz
LDC:
std: 184 ±19 +28 (3420) -14 (6523)
manual: 205 ±59 +120 (2463) -39 (7443)
qznc: 151 ±25 +44 (2983) -17 (6911)
Chris: 194 ±57 +78 (3702) -46 (6251)
Andrei: 101 ±2 +42 ( 435) -1 (9542)
(avg slowdown vs fastest; absolute deviation)
CPU ID: GenuineIntel Intel(R) Core(TM) i5-4200U CPU @ 1.60GHz
Thanks for looking into this! @qznc, could you please look into
updating https://github.com/dlang/phobos/pull/4362 with this
result? One possible tweak is see whether replacing the
function call with inline code helps. Thanks! -- Andrei
What function call should be replaced with inline code?
Overall, I'm very confused and displeased by the benchmark right
now. Initially, the problem was that a naive manual find was
slower than std find in Phobos. Look at the LDC numbers–manual
find is slower than std find. By tweaking the benchmark, the
numbers can be shifted around arbitrarily. Even without tweaking,
it is very processor dependent. Here are the numbers from my
laptop:
./benchmark.ldc
std: 149 ±24 +29 (4275) -21 (5604)
manual: 129 ±37 +90 (2055) -23 (7917)
qznc: 131 ±22 +26 (4381) -20 (5488)
Chris: 154 ±35 +81 (2192) -22 (7672)
Andrei: 118 ±28 +82 (1762) -16 (8194)
(avg slowdown vs fastest; absolute deviation)
CPU ID: GenuineIntel Intel(R) Core(TM) i7 CPU M 620 @
2.67GHz
./benchmark.dmd
std: 143 ±22 +26 (4219) -19 (5602)
manual: 158 ±31 +47 (3436) -24 (6492)
qznc: 101 ±2 +12 (1349) -1 (7851)
Chris: 216 ±38 +56 (3393) -28 (6541)
Andrei: 135 ±31 +48 (3326) -24 (6589)
(avg slowdown vs fastest; absolute deviation)
CPU ID: GenuineIntel Intel(R) Core(TM) i7 CPU M 620 @
2.67GHz
And Desktop:
./benchmark.ldc
std: 129 ±24 +40 (3121) -17 (6767)
manual: 129 ±31 +59 (2668) -21 (7244)
qznc: 112 ±14 +30 (2542) -9 (7312)
Chris: 134 ±33 +58 (2835) -23 (7068)
Andrei: 123 ±27 +53 (2679) -18 (7225)
(avg slowdown vs fastest; absolute deviation)
CPU ID: GenuineIntel Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz
./benchmark.dmd
std: 157 ±31 +44 (3693) -24 (6234)
manual: 143 ±41 +73 (2854) -28 (7091)
qznc: 116 ±21 +35 (3092) -14 (6844)
Chris: 181 ±50 +74 (3452) -38 (6510)
Andrei: 136 ±38 +64 (2975) -27 (6953)
(avg slowdown vs fastest; absolute deviation)
CPU ID: GenuineIntel Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz
