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a5c3bbe0b4
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Austin Clements a5c3bbe0b4 runtime: eliminate write barrier from adjustpointers 
Currently adjustpointers invokes a write barrier for every stack slot
it updates. This is safe---the write barrier always does nothing
because the new value is never a heap pointer---but it's unnecessary
overhead in performance and complexity.

Fix this by rewriting adjustpointers to work with *uintptrs instead of
*unsafe.Pointers. As an added bonus, this makes the code cleaner.

name                   old mean              new mean              delta
BinaryTree17            3.35s × (0.98,1.01)   3.33s × (0.99,1.02)    ~    (p=0.095 n=20+19)
Fannkuch11              2.49s × (1.00,1.01)   2.52s × (0.99,1.01)  +1.23% (p=0.000 n=19+20)
FmtFprintfEmpty        52.2ns × (0.99,1.02)  52.2ns × (0.99,1.02)    ~    (p=0.766 n=19+19)
FmtFprintfString        181ns × (0.99,1.02)   179ns × (0.99,1.01)  -1.06% (p=0.000 n=20+19)
FmtFprintfInt           177ns × (0.99,1.01)   173ns × (0.99,1.02)  -2.26% (p=0.000 n=17+20)
FmtFprintfIntInt        300ns × (0.99,1.01)   302ns × (0.99,1.01)  +0.76% (p=0.000 n=19+20)
FmtFprintfPrefixedInt   253ns × (0.99,1.02)   256ns × (0.99,1.01)  +0.96% (p=0.000 n=20+19)
FmtFprintfFloat         334ns × (0.99,1.02)   334ns × (1.00,1.01)    ~    (p=0.243 n=20+19)
FmtManyArgs            1.16µs × (0.99,1.01)  1.17µs × (0.99,1.02)  +0.88% (p=0.000 n=20+20)
GobDecode              9.16ms × (0.99,1.02)  9.18ms × (1.00,1.00)  +0.21% (p=0.048 n=20+17)
GobEncode              7.03ms × (0.99,1.01)  7.05ms × (0.99,1.01)    ~    (p=0.091 n=19+19)
Gzip                    374ms × (0.99,1.01)   372ms × (0.99,1.02)  -0.50% (p=0.008 n=18+20)
Gunzip                 92.9ms × (0.99,1.01)  92.5ms × (1.00,1.01)  -0.47% (p=0.002 n=19+19)
HTTPClientServer       53.1µs × (0.98,1.01)  52.5µs × (0.99,1.01)  -0.98% (p=0.000 n=20+19)
JSONEncode             17.4ms × (0.99,1.02)  17.5ms × (0.99,1.01)    ~    (p=0.061 n=19+20)
JSONDecode             66.0ms × (0.99,1.02)  64.7ms × (0.99,1.01)  -1.87% (p=0.000 n=20+20)
Mandelbrot200          3.94ms × (1.00,1.01)  3.95ms × (1.00,1.01)    ~    (p=0.799 n=18+19)
GoParse                3.89ms × (0.99,1.02)  3.86ms × (0.99,1.01)  -0.70% (p=0.016 n=20+19)
RegexpMatchEasy0_32     102ns × (0.99,1.02)   102ns × (1.00,1.01)    ~    (p=0.557 n=20+18)
RegexpMatchEasy0_1K     353ns × (0.99,1.02)   341ns × (0.99,1.01)  -3.38% (p=0.000 n=20+20)
RegexpMatchEasy1_32    85.0ns × (0.99,1.02)  85.0ns × (0.99,1.01)    ~    (p=0.851 n=19+20)
RegexpMatchEasy1_1K     521ns × (0.99,1.02)   506ns × (1.00,1.01)  -2.85% (p=0.000 n=20+18)
RegexpMatchMedium_32    142ns × (0.99,1.02)   141ns × (1.00,1.01)  -1.17% (p=0.000 n=20+19)
RegexpMatchMedium_1K   42.8µs × (0.99,1.01)  42.3µs × (0.99,1.01)  -1.07% (p=0.000 n=20+19)
RegexpMatchHard_32     2.17µs × (0.99,1.01)  2.16µs × (1.00,1.01)  -0.51% (p=0.042 n=20+18)
RegexpMatchHard_1K     65.6µs × (0.99,1.01)  64.8µs × (1.00,1.00)  -1.21% (p=0.000 n=20+17)
Revcomp                 581ms × (0.99,1.04)   536ms × (1.00,1.01)  -7.71% (p=0.000 n=20+18)
Template               77.2ms × (0.99,1.01)  76.8ms × (0.99,1.01)    ~    (p=0.426 n=20+18)
TimeParse               369ns × (0.99,1.02)   371ns × (1.00,1.01)    ~    (p=0.117 n=20+19)
TimeFormat              371ns × (0.99,1.02)   391ns × (0.99,1.01)  +5.33% (p=0.000 n=20+19)

Change-Id: I5b952ba577ac4365c8c87db837c5804a1e30b7be
Reviewed-on: https://go-review.googlesource.com/10293
Reviewed-by: Russ Cox <rsc@golang.org>
2015-05-21 18:35:49 +00:00
api api: refresh next.txt 2015-05-14 21:31:18 +00:00
doc all: retire architecture letter in file names, public API 2015-05-21 17:32:17 +00:00
lib/time remove the obsolete lib/codereview. 2014-12-08 07:51:54 +00:00
misc cmd/link: move to cmd/newlink 2015-05-21 17:31:40 +00:00
src runtime: eliminate write barrier from adjustpointers 2015-05-21 18:35:49 +00:00
test all: retire architecture letter in file names, public API 2015-05-21 17:32:17 +00:00
.gitattributes .gitattributes: prevent all magic line ending changes 2014-12-12 23:14:54 +00:00
.gitignore .gitignore: ignore ARM64 build products 2015-03-16 18:44:22 +00:00
AUTHORS A+C: add another email address for Emil Hessman 2014-11-12 10:01:23 -08:00
CONTRIBUTING.md doc: direct people to the mailing list 2015-01-18 21:27:07 +00:00
CONTRIBUTORS CONTRIBUTORS: add Burcu Dogan's personal mail 2015-05-06 16:06:42 +00:00
favicon.ico
LICENSE
PATENTS
README.md doc: fix broken link in README 2015-02-19 05:50:57 +00:00
robots.txt

README.md

The Go Programming Language

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Binary Distribution Notes

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For example, if you extracted the tar file into $HOME/go, you might put the following in your .profile:

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See https://golang.org/doc/install or doc/install.html for more details.