runtime: faster GC mark phase
Also bump MaxGcproc to 8.
benchmark old ns/op new ns/op delta
Parser
3796323000 3763880000 -0.85%
Parser-2
3591752500 3518560250 -2.04%
Parser-4
3423825250 3334955250 -2.60%
Parser-8
3304585500 3267014750 -1.14%
Parser-16
3313615750 3286160500 -0.83%
Tree
984128500 942501166 -4.23%
Tree-2
932564444 883266222 -5.29%
Tree-4
835831000 799912777 -4.30%
Tree-8
819238500 789717333 -3.73%
Tree-16
880837833 837840055 -5.13%
Tree2
604698100 579716900 -4.13%
Tree2-2
372414500 356765200 -4.20%
Tree2-4
187488100 177455900 -5.56%
Tree2-8
136315300 102086700 -25.11%
Tree2-16
93725900 76705800 -22.18%
ParserPause
157441210 166202783 +5.56%
ParserPause-2
93842650 85199900 -9.21%
ParserPause-4
56844404 53535684 -5.82%
ParserPause-8
35739446 30767613 -16.15%
ParserPause-16
32718255 27212441 -16.83%
TreePause
29610557 29787725 +0.60%
TreePause-2
24001659 20674421 -13.86%
TreePause-4
15114887 12842781 -15.03%
TreePause-8
13128725 10741747 -22.22%
TreePause-16
16131360 12506901 -22.47%
Tree2Pause
2673350920 2651045280 -0.83%
Tree2Pause-2
1796999200 1709350040 -4.88%
Tree2Pause-4
1163553320 1090706480 -6.67%
Tree2Pause-8
987032520 858916360 -25.11%
Tree2Pause-16
864758560 809567480 -6.81%
ParserLastPause
280537000 289047000 +3.03%
ParserLastPause-2
183030000 166748000 -8.90%
ParserLastPause-4
105817000 91552000 -13.48%
ParserLastPause-8
65127000 53288000 -18.18%
ParserLastPause-16
45258000 38334000 -15.30%
TreeLastPause
45072000 51449000 +12.39%
TreeLastPause-2
39269000 37866000 -3.57%
TreeLastPause-4
23564000 20649000 -12.37%
TreeLastPause-8
20881000 15807000 -24.30%
TreeLastPause-16
23297000 17309000 -25.70%
Tree2LastPause
6046912000 5797120000 -4.13%
Tree2LastPause-2
3724034000 3567592000 -4.20%
Tree2LastPause-4
1874831000 1774524000 -5.65%
Tree2LastPause-8
1363108000 1020809000 -12.79%
Tree2LastPause-16
937208000 767019000 -22.18%
R=rsc, 0xe2.0x9a.0x9b
CC=golang-dev
https://golang.org/cl/
6223050