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dcd9e5bc0f
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Austin Clements dcd9e5bc0f runtime: make putfull start mark workers 
Currently we depend on the good graces and timing of the scheduler to
get opportunities to start dedicated mark workers. In the worst case,
it may take 10ms to get dedicated mark workers going at the beginning
of mark 1 and mark 2 or after the amount of available work has dropped
and gone back up.

Instead of waiting for the regular preemption logic to get around to
us, make putfull enlist a random P if we're not already running enough
dedicated workers. This should improve performance stability of the
garbage collector and is likely to improve the overall performance
somewhat.

No overall effect on the go1 benchmarks. It speeds up the garbage
benchmark by 12%, which more than counters the performance loss from
the previous commit.

name              old time/op  new time/op  delta
XBenchGarbage-12  6.32ms ± 4%  5.58ms ± 2%  -11.68%  (p=0.000 n=20+16)

name                      old time/op    new time/op    delta
BinaryTree17-12              3.18s ± 5%     3.12s ± 4%  -1.83%  (p=0.021 n=20+20)
Fannkuch11-12                2.50s ± 2%     2.46s ± 2%  -1.57%  (p=0.000 n=18+19)
FmtFprintfEmpty-12          50.8ns ± 3%    50.4ns ± 3%    ~     (p=0.184 n=20+20)
FmtFprintfString-12          167ns ± 2%     171ns ± 1%  +2.46%  (p=0.000 n=20+19)
FmtFprintfInt-12             161ns ± 2%     163ns ± 2%  +1.81%  (p=0.000 n=20+20)
FmtFprintfIntInt-12          269ns ± 1%     266ns ± 1%  -0.81%  (p=0.002 n=19+20)
FmtFprintfPrefixedInt-12     237ns ± 2%     231ns ± 2%  -2.86%  (p=0.000 n=20+20)
FmtFprintfFloat-12           313ns ± 2%     313ns ± 1%    ~     (p=0.681 n=20+20)
FmtManyArgs-12              1.05µs ± 2%    1.03µs ± 1%  -2.26%  (p=0.000 n=20+20)
GobDecode-12                8.66ms ± 1%    8.67ms ± 1%    ~     (p=0.380 n=19+20)
GobEncode-12                6.56ms ± 1%    6.56ms ± 2%    ~     (p=0.607 n=19+20)
Gzip-12                      317ms ± 1%     314ms ± 2%  -1.10%  (p=0.000 n=20+19)
Gunzip-12                   42.1ms ± 1%    42.2ms ± 1%  +0.27%  (p=0.044 n=20+19)
HTTPClientServer-12         62.7µs ± 1%    62.0µs ± 1%  -1.04%  (p=0.000 n=19+18)
JSONEncode-12               16.7ms ± 1%    16.8ms ± 2%  +0.59%  (p=0.021 n=20+20)
JSONDecode-12               58.2ms ± 1%    61.4ms ± 2%  +5.43%  (p=0.000 n=18+19)
Mandelbrot200-12            3.84ms ± 1%    3.87ms ± 2%  +0.79%  (p=0.008 n=18+20)
GoParse-12                  3.86ms ± 2%    3.76ms ± 2%  -2.60%  (p=0.000 n=20+20)
RegexpMatchEasy0_32-12       100ns ± 2%     100ns ± 1%  -0.68%  (p=0.005 n=18+15)
RegexpMatchEasy0_1K-12       332ns ± 1%     342ns ± 1%  +3.16%  (p=0.000 n=19+19)
RegexpMatchEasy1_32-12      82.9ns ± 3%    83.0ns ± 2%    ~     (p=0.906 n=19+20)
RegexpMatchEasy1_1K-12       487ns ± 1%     494ns ± 1%  +1.50%  (p=0.000 n=17+20)
RegexpMatchMedium_32-12      131ns ± 2%     130ns ± 1%    ~     (p=0.686 n=19+20)
RegexpMatchMedium_1K-12     39.6µs ± 1%    39.2µs ± 1%  -1.09%  (p=0.000 n=18+19)
RegexpMatchHard_32-12       2.04µs ± 1%    2.04µs ± 2%    ~     (p=0.804 n=20+20)
RegexpMatchHard_1K-12       61.7µs ± 2%    61.3µs ± 2%    ~     (p=0.052 n=18+20)
Revcomp-12                   529ms ± 2%     533ms ± 1%  +0.83%  (p=0.003 n=20+19)
Template-12                 70.7ms ± 2%    71.0ms ± 2%    ~     (p=0.065 n=20+19)
TimeParse-12                 351ns ± 2%     355ns ± 1%  +1.25%  (p=0.000 n=19+20)
TimeFormat-12                362ns ± 2%     373ns ± 1%  +2.83%  (p=0.000 n=18+20)
[Geo mean]                  62.2µs         62.3µs       +0.13%

name                      old speed      new speed      delta
GobDecode-12              88.6MB/s ± 1%  88.5MB/s ± 1%    ~     (p=0.392 n=19+20)
GobEncode-12               117MB/s ± 1%   117MB/s ± 1%    ~     (p=0.622 n=19+20)
Gzip-12                   61.1MB/s ± 1%  61.8MB/s ± 2%  +1.11%  (p=0.000 n=20+19)
Gunzip-12                  461MB/s ± 1%   460MB/s ± 1%  -0.27%  (p=0.044 n=20+19)
JSONEncode-12              116MB/s ± 1%   115MB/s ± 2%  -0.58%  (p=0.022 n=20+20)
JSONDecode-12             33.3MB/s ± 1%  31.6MB/s ± 2%  -5.15%  (p=0.000 n=18+19)
GoParse-12                15.0MB/s ± 2%  15.4MB/s ± 2%  +2.66%  (p=0.000 n=20+20)
RegexpMatchEasy0_32-12     317MB/s ± 2%   319MB/s ± 2%    ~     (p=0.052 n=20+20)
RegexpMatchEasy0_1K-12    3.08GB/s ± 1%  2.99GB/s ± 1%  -3.07%  (p=0.000 n=19+19)
RegexpMatchEasy1_32-12     386MB/s ± 3%   386MB/s ± 2%    ~     (p=0.939 n=19+20)
RegexpMatchEasy1_1K-12    2.10GB/s ± 1%  2.07GB/s ± 1%  -1.46%  (p=0.000 n=17+20)
RegexpMatchMedium_32-12   7.62MB/s ± 2%  7.64MB/s ± 1%    ~     (p=0.702 n=19+20)
RegexpMatchMedium_1K-12   25.9MB/s ± 1%  26.1MB/s ± 2%  +0.99%  (p=0.000 n=18+20)
RegexpMatchHard_32-12     15.7MB/s ± 1%  15.7MB/s ± 2%    ~     (p=0.723 n=20+20)
RegexpMatchHard_1K-12     16.6MB/s ± 2%  16.7MB/s ± 2%    ~     (p=0.052 n=18+20)
Revcomp-12                 481MB/s ± 2%   477MB/s ± 1%  -0.83%  (p=0.003 n=20+19)
Template-12               27.5MB/s ± 2%  27.3MB/s ± 2%    ~     (p=0.062 n=20+19)
[Geo mean]                99.4MB/s       99.1MB/s       -0.35%

Change-Id: I914d8cadded5a230509d118164a4c201601afc06
Reviewed-on: https://go-review.googlesource.com/16298
Reviewed-by: Rick Hudson <rlh@golang.org>
2015-11-04 20:15:51 +00:00
api api: update next.txt 2015-10-12 23:00:00 +00:00
doc doc/go1.6.txt: mention possible GOTRACEBACK change 2015-10-30 18:43:53 +00:00
lib/time lib/time: update to IANA release 2015e. 2015-07-22 02:56:31 +00:00
misc misc/ios: keep whole buffer in go_darwin_arm_exec 2015-11-04 20:00:35 +00:00
src runtime: make putfull start mark workers 2015-11-04 20:15:51 +00:00
test runtime: fix finalization and profiling of tiny allocations 2015-11-03 18:57:18 +00:00
.gitattributes
.gitignore .gitignore: ignore y.output 2015-06-10 00:28:52 +00:00
AUTHORS A+C: automated updates 2015-09-10 00:59:04 +00:00
CONTRIBUTING.md doc: suggest security@golang.org for reporting security issues 2015-06-26 09:53:36 +00:00
CONTRIBUTORS C: Add Brian Gitonga Marete's Google email address (Google CLA). 2015-10-09 15:21:30 +00:00
favicon.ico
LICENSE
PATENTS
README.md readme: emphasize issue tracker is for bugs/proposals 2015-10-02 18:44:14 +00:00
robots.txt

README.md

The Go Programming Language

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