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Russ Cox
d6b3f37e1e bytes: asm for bytes.IndexByte 
PERFORMANCE DIFFERENCE

SUMMARY

                                                   amd64           386
2.2 GHz AMD Opteron 8214 HE (Linux)             3.0x faster    8.2x faster
3.60 GHz Intel Xeon (Linux)                     2.2x faster    6.2x faster
2.53 GHz Intel Core2 Duo E7200 (Linux)          1.5x faster    4.4x faster
2.66 Ghz Intel Xeon 5150 (Mac Pro, OS X)        1.5x SLOWER    3.0x faster
2.33 GHz Intel Xeon E5435 (Linux)               1.5x SLOWER    3.0x faster
2.33 GHz Intel Core2 T7600 (MacBook Pro, OS X)  1.4x SLOWER    3.0x faster
1.83 GHz Intel Core2 T5600 (Mac Mini, OS X)        none*       3.0x faster

* but yesterday I consistently saw 1.4x SLOWER.

DETAILS

2.2 GHz AMD Opteron 8214 HE (Linux)

amd64 (3x faster)

IndexByte4K            500000           3733 ns/op     1097.24 MB/s
IndexByte4M               500        4328042 ns/op      969.10 MB/s
IndexByte64M               50       67866160 ns/op      988.84 MB/s

IndexBytePortable4K    200000          11161 ns/op      366.99 MB/s
IndexBytePortable4M       100       11795880 ns/op      355.57 MB/s
IndexBytePortable64M       10      188675000 ns/op      355.68 MB/s

386 (8.2x faster)

IndexByte4K            500000           3734 ns/op     1096.95 MB/s
IndexByte4M               500        4209954 ns/op      996.28 MB/s
IndexByte64M               50       68031980 ns/op      986.43 MB/s

IndexBytePortable4K     50000          30670 ns/op      133.55 MB/s
IndexBytePortable4M        50       31868220 ns/op      131.61 MB/s
IndexBytePortable64M        2      508851500 ns/op      131.88 MB/s

3.60 GHz Intel Xeon (Linux)

amd64 (2.2x faster)

IndexByte4K            500000           4612 ns/op      888.12 MB/s
IndexByte4M               500        4835250 ns/op      867.44 MB/s
IndexByte64M               20       77388450 ns/op      867.17 MB/s

IndexBytePortable4K    200000          10306 ns/op      397.44 MB/s
IndexBytePortable4M       100       11201460 ns/op      374.44 MB/s
IndexBytePortable64M       10      179456800 ns/op      373.96 MB/s

386 (6.3x faster)

IndexByte4K            500000           4631 ns/op      884.47 MB/s
IndexByte4M               500        4846388 ns/op      865.45 MB/s
IndexByte64M               20       78691200 ns/op      852.81 MB/s

IndexBytePortable4K    100000          28989 ns/op      141.29 MB/s
IndexBytePortable4M        50       31183180 ns/op      134.51 MB/s
IndexBytePortable64M        5      498347200 ns/op      134.66 MB/s

2.53 GHz Intel Core2 Duo E7200  (Linux)

amd64 (1.5x faster)

IndexByte4K            500000           6502 ns/op      629.96 MB/s
IndexByte4M               500        6692208 ns/op      626.74 MB/s
IndexByte64M               10      107410400 ns/op      624.79 MB/s

IndexBytePortable4K    200000           9721 ns/op      421.36 MB/s
IndexBytePortable4M       100       10013680 ns/op      418.86 MB/s
IndexBytePortable64M       10      160460800 ns/op      418.23 MB/s

386 (4.4x faster)

IndexByte4K            500000           6505 ns/op      629.67 MB/s
IndexByte4M               500        6694078 ns/op      626.57 MB/s
IndexByte64M               10      107397600 ns/op      624.86 MB/s

IndexBytePortable4K    100000          28835 ns/op      142.05 MB/s
IndexBytePortable4M        50       29562680 ns/op      141.88 MB/s
IndexBytePortable64M        5      473221400 ns/op      141.81 MB/s

2.66 Ghz Intel Xeon 5150  (Mac Pro, OS X)

amd64 (1.5x SLOWER)

IndexByte4K            200000           9290 ns/op      440.90 MB/s
IndexByte4M               200        9568925 ns/op      438.33 MB/s
IndexByte64M               10      154473600 ns/op      434.44 MB/s

IndexBytePortable4K    500000           6202 ns/op      660.43 MB/s
IndexBytePortable4M       500        6583614 ns/op      637.08 MB/s
IndexBytePortable64M       20      107166250 ns/op      626.21 MB/s

386 (3x faster)

IndexByte4K            200000           9301 ns/op      440.38 MB/s
IndexByte4M               200        9568025 ns/op      438.37 MB/s
IndexByte64M               10      154391000 ns/op      434.67 MB/s

IndexBytePortable4K    100000          27526 ns/op      148.80 MB/s
IndexBytePortable4M       100       28302490 ns/op      148.20 MB/s
IndexBytePortable64M        5      454170200 ns/op      147.76 MB/s

2.33 GHz Intel Xeon E5435  (Linux)

amd64 (1.5x SLOWER)

IndexByte4K            200000          10601 ns/op      386.38 MB/s
IndexByte4M               100       10827240 ns/op      387.38 MB/s
IndexByte64M               10      173175500 ns/op      387.52 MB/s

IndexBytePortable4K    500000           7082 ns/op      578.37 MB/s
IndexBytePortable4M       500        7391792 ns/op      567.43 MB/s
IndexBytePortable64M       20      122618550 ns/op      547.30 MB/s

386 (3x faster)

IndexByte4K            200000          11074 ns/op      369.88 MB/s
IndexByte4M               100       10902620 ns/op      384.71 MB/s
IndexByte64M               10      181292800 ns/op      370.17 MB/s

IndexBytePortable4K     50000          31725 ns/op      129.11 MB/s
IndexBytePortable4M        50       32564880 ns/op      128.80 MB/s
IndexBytePortable64M        2      545926000 ns/op      122.93 MB/s

2.33 GHz Intel Core2 T7600 (MacBook Pro, OS X)

amd64 (1.4x SLOWER)

IndexByte4K            200000          11120 ns/op      368.35 MB/s
IndexByte4M               100       11531950 ns/op      363.71 MB/s
IndexByte64M               10      184819000 ns/op      363.11 MB/s

IndexBytePortable4K    500000           7419 ns/op      552.10 MB/s
IndexBytePortable4M       200        8018710 ns/op      523.06 MB/s
IndexBytePortable64M       10      127614900 ns/op      525.87 MB/s

386 (3x faster)

IndexByte4K            200000          11114 ns/op      368.54 MB/s
IndexByte4M               100       11443530 ns/op      366.52 MB/s
IndexByte64M               10      185212000 ns/op      362.34 MB/s

IndexBytePortable4K     50000          32891 ns/op      124.53 MB/s
IndexBytePortable4M        50       33930580 ns/op      123.61 MB/s
IndexBytePortable64M        2      545400500 ns/op      123.05 MB/s

1.83 GHz Intel Core2 T5600  (Mac Mini, OS X)

amd64 (no difference)

IndexByte4K            200000          13497 ns/op      303.47 MB/s
IndexByte4M               100       13890650 ns/op      301.95 MB/s
IndexByte64M                5      222358000 ns/op      301.81 MB/s

IndexBytePortable4K    200000          13584 ns/op      301.53 MB/s
IndexBytePortable4M       100       13913280 ns/op      301.46 MB/s
IndexBytePortable64M       10      222572600 ns/op      301.51 MB/s

386 (3x faster)

IndexByte4K            200000          13565 ns/op      301.95 MB/s
IndexByte4M               100       13882640 ns/op      302.13 MB/s
IndexByte64M                5      221411600 ns/op      303.10 MB/s

IndexBytePortable4K     50000          39978 ns/op      102.46 MB/s
IndexBytePortable4M        50       41038160 ns/op      102.20 MB/s
IndexBytePortable64M        2      656362500 ns/op      102.24 MB/s

R=r
CC=golang-dev
https://golang.org/cl/166055
 2009-12-04 10:23:43 -08:00
Russ Cox
2a5f0c67ca spec: document that built-ins cannot be used as func values 
R=gri
CC=golang-dev
https://golang.org/cl/164088
 2009-12-04 10:23:12 -08:00
Russ Cox
609eeee817 make Native Client support build again, 
add README explaining how to try the
web demos.

Fixes #339.

R=r
CC=barry.d.silverman, bss, vadim
https://golang.org/cl/165057
 2009-12-04 10:11:32 -08:00
Russ Cox
11384eecf8 testing: compute MB/s in benchmarks 
R=r
https://golang.org/cl/166060
 2009-12-04 09:56:31 -08:00
Rob Pike
4ed57173b4 avoid an allocation inside bytes.Buffer by providing a static array. 
R=rsc
https://golang.org/cl/165058
 2009-12-04 00:26:08 -08:00
Russ Cox
f2c7a20142 8l: fix print line number format, buffer overflow 
R=ken2
https://golang.org/cl/165059
 2009-12-03 23:29:48 -08:00
Russ Cox
3b858fb808 net: turn off empty packet test by default 
Fixes #374.

R=r
https://golang.org/cl/166053
 2009-12-03 22:19:55 -08:00
Russ Cox
9da6666a8a gc: check for assignment to private fields during initialization 
R=ken2
https://golang.org/cl/165055
 2009-12-03 22:09:58 -08:00
Ken Thompson
62be24d949 6g code gen bug 
R=rsc
https://golang.org/cl/166052
 2009-12-03 20:28:24 -08:00
Michael Elkins
f3d63bea42 Add Count, Cycle, ZipWith, GroupBy, Repeat, RepeatTimes, Unique to exp/iterable. 
Modify iterFunc to take chan<- instead of just chan.

R=rsc, dsymonds1
CC=golang-dev, r
https://golang.org/cl/160064
 2009-12-03 20:03:07 -08:00
Adam Langley
e93132c982 crypto/rsa: fix shadowing error. 
Fixes bug 375.

R=rsc
https://golang.org/cl/165045
 2009-12-03 19:33:23 -08:00
Russ Cox
cf37254b1c runtime: fix Caller crash on 386. 
Fixes #176.

R=r
https://golang.org/cl/166044
 2009-12-03 17:24:14 -08:00
Russ Cox
6301fb4134 faq: add question about translation 
R=jini, r
https://golang.org/cl/163092
 2009-12-03 17:23:33 -08:00
Russ Cox
9a86cc679a codereview: do not gofmt deleted files 
R=r
https://golang.org/cl/164083
 2009-12-03 17:23:11 -08:00
Russ Cox
aaa2374b74 Make.conf: fix if $HOME has spaces 
R=r
https://golang.org/cl/164086
 2009-12-03 17:22:43 -08:00
Russ Cox
7e5055ceea runtime: malloc fixes 
* throw away dead code
  * add mlookup counter
  * add malloc counter
  * set up for blocks with no pointers

Fixes #367.

R=r
https://golang.org/cl/165050
 2009-12-03 17:22:23 -08:00
Rob Pike
10a349a7c1 The String() method requires global state that makes it not work outside of this package, 
so make it a local method (_String()).

R=rsc
CC=golang-dev
https://golang.org/cl/165049
 2009-12-03 17:14:32 -08:00
Rob Pike
fcc4dd6d64 error propagation in gob/encoder. 
R=rsc
CC=golang-dev
https://golang.org/cl/165048
 2009-12-03 17:12:57 -08:00
Rob Pike
bc3e34759c Add ReadFrom and WriteTo methods to bytes.Buffer, to enable i/o without buffer allocation. 
Use them in Copy and Copyn.
Speed up ReadFile by using ReadFrom and avoiding Copy altogether (a minor win).

R=rsc, gri
CC=golang-dev
https://golang.org/cl/166041
 2009-12-03 12:56:16 -08:00
Christopher Wedgwood
7e7008fa5e gc: Allow allow data types up to 1GB 
R=rsc
https://golang.org/cl/164095
 2009-12-03 12:46:34 -08:00
Robert Griesemer
6db683fe4d - include type-associated consts and vars when filtering a PackageDoc 
- fixes a godoc issue (for instance, "godoc os EOF" now shows an entry)

R=r
CC=rsc
https://golang.org/cl/165042
 2009-12-03 11:25:20 -08:00
Russ Cox
c6e316a4b9 gc: handle _ = <-c in select. 
Fixes #238.

R=ken2
https://golang.org/cl/163098
 2009-12-03 01:30:19 -08:00
Russ Cox
05a1eb1ab0 gc: recursive type error 
Fixes #245.

R=ken2
https://golang.org/cl/164094
 2009-12-03 01:12:02 -08:00
Russ Cox
41861a8812 gc: better diagnosis of initialization loops 
Fixes bug 292.

R=ken2
https://golang.org/cl/164093
 2009-12-03 00:51:03 -08:00
Russ Cox
e733766dda gc: minor import grammar bug fixes 
Fixes #364.

R=ken2
https://golang.org/cl/164092
 2009-12-03 00:10:32 -08:00
Rob Pike
d984f98996 minor improvement to formatting: don't allocate padding strings every time. 
R=rsc
https://golang.org/cl/164090
 2009-12-03 00:04:40 -08:00
Russ Cox
272d156357 gc: function argument ordering bug 
Fixes #370.

R=ken2
https://golang.org/cl/163097
 2009-12-02 23:54:51 -08:00
Russ Cox
8777759f59 gc: make 'invalid rune in string' a little less cryptic 
Fixes #371.

R=ken2
https://golang.org/cl/164091
 2009-12-02 23:23:11 -08:00
Rob Pike
b0683bd77a move ReadFile, WriteFile, and ReadDir into a separate io/ioutil package. 
this breaks the dependency of package io on package bytes.

R=rsc
CC=golang-dev
https://golang.org/cl/163085
 2009-12-02 22:02:14 -08:00
Peter Froehlich
1eba218e44 Runes: turn string into []int 
Split: fixed typo in documentation

R=rsc, r, r1
https://golang.org/cl/157170
 2009-12-02 20:47:38 -08:00
Robert Griesemer
c0efa07c65 updated documentation for gofmt 
R=rsc
https://golang.org/cl/164085
 2009-12-02 19:32:15 -08:00
Russ Cox
69c0edd59b 8g: discard tempalloc/tempfree experiment 
in favor of tempname.
allows optimizer to do more.
unfortunately, optimizer seems to be broken; disable it.

R=ken2
https://golang.org/cl/163091
 2009-12-02 18:31:29 -08:00
Russ Cox
fdb030d86f 6g etc: groundwork for eliminating redundant bounds checks. 
drop check in range over array.
	drop check in [256]array indexed by byte.

R=ken2
https://golang.org/cl/163088
 2009-12-02 17:30:07 -08:00
Robert Griesemer
dc7355a974 Add flag -tabindent to gofmt: forces use of 
tabs for indentation even if -spaces is set.

Changes to gofmt:
- added -tabindent flag
- don't recompute parser and printer mode repeatedly

Changes to go/printer:
- provide new printing mode TabIndent

Changes to tabwriter:
- implement new mode TabIndent to use tabs independent
  of the actual padding character for leading empty columns
- distinguish between minimal cell width and tab width
  (tabwidth is only used if the output contains tabs,
  minwidth and padding are always considered)
- fixed and added more comments
- some additional factoring

By default, -tabindent is disabled and the default gofmt
behavior is unchanged. By setting -spaces and -tabindent,
gofmt will use tabs for indentation but do any other
alignment with spaces. This permits a user to change the
visible indentation by simply changing the editor's tab
width and the code will remain properly aligned without
the need to rerun gofmt.

R=rsc
https://golang.org/cl/163068
 2009-12-02 16:57:15 -08:00
Russ Cox
e89441ba8f net: test and fix support for 0-length datagram packets. 
Fixes #274.

R=r
CC=jonathan.r.hudson
https://golang.org/cl/163072
 2009-12-02 15:17:49 -08:00
Rob Pike
acf4dd4d56 change the naming example from Vector to Ring due to loss of vector.New() 
R=rsc
CC=golang-dev
https://golang.org/cl/164082
 2009-12-02 13:46:02 -08:00
Ian Lance Taylor
ccd026486a Add copy to the list of predeclared functions. 
R=gri
https://golang.org/cl/164081
 2009-12-02 13:26:39 -08:00
Fazlul Shahriar
0aa13c999b gofmt: race condition in error reporting and setting exit code 
How to reproduce:

	$ mkdir /tmp/foo
	$ cp /dev/null /tmp/foo/bar.go
	$ chmod -r /tmp/foo/bar.go
	$ gofmt /tmp/foo
	open /tmp/foo/bar.go: permission denied
	$ echo $?		# should echo 2
	0
	$

Maybe you need to put a call to time.Sleep at the beginning of report().

R=gri
CC=golang-dev
https://golang.org/cl/164073
 2009-12-02 13:02:42 -08:00
Robert Griesemer
d8bc797ed5 apply gofmt to json files 
R=rsc
https://golang.org/cl/164071
 2009-12-02 11:40:54 -08:00
Rob Pike
114f73f822 fix segfault printing errors. add test case and improve messages. 
Fixes #338.

R=rsc
CC=golang-dev
https://golang.org/cl/163083
 2009-12-02 10:41:28 -08:00
Rob Pike
f6c0eba741 test that arrays work properly. 
can't mix slices and arrays now; perhaps that should be a TODO

R=rsc
https://golang.org/cl/164079
 2009-12-02 10:25:14 -08:00
Russ Cox
69f893a127 codereview: move reviewers to cc line after submit, 
so that the issue stops showing up on the
  per-reviewer dashboard page.

R=r
https://golang.org/cl/164075
 2009-12-02 09:10:59 -08:00
Russ Cox
9e55d0d018 time: another bug in SecondsToUTC. 
added random test to look for more.

Fixes #363.

R=r, cw
https://golang.org/cl/163071
 2009-12-02 08:27:57 -08:00
Ian Lance Taylor
952b91e4ad Add Shutdown to 32-bit GNU/Linux build. 
Submitting as a TBR to fix the build.

R=dho, rsc
https://golang.org/cl/164078
 2009-12-02 08:24:14 -08:00
Devon H. O'Dell
e9a8ab031d lxml.etree is the wrong location for this alt package 
on my linux machine this is the correct one. lxml.etree
  exists with an ElementTree class, but does not contain
  an .XML method.

R=rsc
https://golang.org/cl/163082
 2009-12-02 08:18:26 -08:00
Devon H. O'Dell
742221d20b xml.etree can also be lxml.etree (e.g. CentOS 5.4 with Python 2.4.3) 
R=rsc
CC=golang-dev
https://golang.org/cl/164053
 2009-12-02 01:16:38 -08:00
Russ Cox
8d652ee8ce time: fix handling of Jan 1 1601, 1201, 801, ... 
R=r
CC=hurtonm
https://golang.org/cl/164074
 2009-12-01 23:38:06 -08:00
Devon H. O'Dell
eb16346dac net: fix netFD.Close races 
Fixes #271.
Fixes #321.

R=rsc, agl, cw
CC=golang-dev
https://golang.org/cl/163052
 2009-12-01 23:28:57 -08:00
Rob Pike
ff3ea68e52 explicitly catch attempt to decode into a value - must be a pointer to see the result. 
R=rsc
https://golang.org/cl/163070
 2009-12-01 21:47:00 -08:00
Rob Pike
f9810f1b12 make io.ReadFile use Stat.Size as a hint for preallocation 
R=rsc
CC=golang-dev
https://golang.org/cl/163069
 2009-12-01 21:44:24 -08:00