runtime: preparation for parallel GC
make MHeap.allspans an array instead on a linked-list,
it's required for parallel for
benchmark old ns/op new ns/op delta
garbage.BenchmarkTree
494435529 487962705 -1.31%
garbage.BenchmarkTree-2
499652705 485358000 -2.86%
garbage.BenchmarkTree-4
468482117 454093117 -3.07%
garbage.BenchmarkTree-8
488533235 471872470 -3.41%
garbage.BenchmarkTree-16
507835176 492558470 -3.01%
garbage.BenchmarkTree2
31453900 31404300 -0.16%
garbage.BenchmarkTree2-2
21440600 21477000 +0.17%
garbage.BenchmarkTree2-4
10982000 11117400 +1.23%
garbage.BenchmarkTree2-8
7544700 7456700 -1.17%
garbage.BenchmarkTree2-16
7049500 6805700 -3.46%
garbage.BenchmarkParser
4448988000 4453264000 +0.10%
garbage.BenchmarkParser-2
4086045000 4057948000 -0.69%
garbage.BenchmarkParser-4
3677365000 3661246000 -0.44%
garbage.BenchmarkParser-8
3517253000 3540190000 +0.65%
garbage.BenchmarkParser-16
3506562000 3463478000 -1.23%
garbage.BenchmarkTreePause
20969784 21100238 +0.62%
garbage.BenchmarkTreePause-2
20215875 20139572 -0.38%
garbage.BenchmarkTreePause-4
17240709 16683624 -3.23%
garbage.BenchmarkTreePause-8
18196386 17639306 -3.06%
garbage.BenchmarkTreePause-16
20621158 20215056 -1.97%
garbage.BenchmarkTree2Pause
173992142 173872380 -0.07%
garbage.BenchmarkTree2Pause-2
131281904 131366666 +0.06%
garbage.BenchmarkTree2Pause-4
93484952 95109619 +1.74%
garbage.BenchmarkTree2Pause-8
88950523 86533333 -2.72%
garbage.BenchmarkTree2Pause-16
86071238 84089190 -2.30%
garbage.BenchmarkParserPause
135815000 135255952 -0.41%
garbage.BenchmarkParserPause-2
92691523 91451428 -1.34%
garbage.BenchmarkParserPause-4
53392190 51611904 -3.33%
garbage.BenchmarkParserPause-8
36059523 35116666 -2.61%
garbage.BenchmarkParserPause-16
30174300 27340600 -9.39%
garbage.BenchmarkTreeLastPause
28420000 29142000 +2.54%
garbage.BenchmarkTreeLastPause-2
23514000 26779000 +13.89%
garbage.BenchmarkTreeLastPause-4
21773000 18660000 -14.30%
garbage.BenchmarkTreeLastPause-8
24072000 21276000 -11.62%
garbage.BenchmarkTreeLastPause-16
25149000 28541000 +13.49%
garbage.BenchmarkTree2LastPause
314491000 313982000 -0.16%
garbage.BenchmarkTree2LastPause-2
214363000 214715000 +0.16%
garbage.BenchmarkTree2LastPause-4
109778000 111115000 +1.22%
garbage.BenchmarkTree2LastPause-8
75390000 74522000 -1.15%
garbage.BenchmarkTree2LastPause-16
70333000 67880000 -3.49%
garbage.BenchmarkParserLastPause
327247000 326815000 -0.13%
garbage.BenchmarkParserLastPause-2
217039000 212529000 -2.08%
garbage.BenchmarkParserLastPause-4
119722000 111535000 -6.84%
garbage.BenchmarkParserLastPause-8
70806000 69613000 -1.68%
garbage.BenchmarkParserLastPause-16
62813000 48009000 -23.57%
R=rsc, r
CC=golang-dev
https://golang.org/cl/
5992055