- 06 Apr, 2016 9 commits
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Brad Fitzpatrick authored
ReadAtSizer is a common abstraction for a stateless, concurrently-readable fixed number of bytes. This interface has existed in various codebases for over 3 years (previously usually named SizeReaderAt). It is used inside Google in dl.google.com (mentioned in https://talks.golang.org/2013/oscon-dl.slide) and other packages. It is used in Camlistore, in Juju, in the Google API Go client, in github.com/nightlyone/views, and 33 other pages of Github search results. It is implemented by io.SectionReader, bytes.Reader, strings.Reader, etc. Time to finally promote this interface to the standard library and give it a standard name, blessing it as best practice. Updates #7263 Updates #14889 Change-Id: Id28c0cafa7d2d37e8887c54708b5daf1b11c83ea Reviewed-on: https://go-review.googlesource.com/21492Reviewed-by:
Rob Pike <r@golang.org>
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Brad Fitzpatrick authored
Change-Id: I938f61763c3256a876d62aeb54ef8c25cc4fc90e Reviewed-on: https://go-review.googlesource.com/21567Reviewed-by:
Minux Ma <minux@golang.org>
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Brad Fitzpatrick authored
Change-Id: I791c47014fe69e8529c7b2f0b9a554e47902d46c Reviewed-on: https://go-review.googlesource.com/21566Reviewed-by:
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David Symonds authored
Change-Id: I5147dbf4e85cf42cd1f32c57861e4c16d9dbd049 Reviewed-on: https://go-review.googlesource.com/21529Reviewed-by:
Brad Fitzpatrick <bradfitz@golang.org> Reviewed-by:
Andrew Gerrand <adg@golang.org>
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Brad Fitzpatrick authored
Change-Id: I25c51280ba55120ffeaf08222f5ac5d471632d89 Reviewed-on: https://go-review.googlesource.com/21535Reviewed-by:
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Josh Bleecher Snyder authored
Changes generated with eg and then manually checked and in some cases simplified. Passes toolstash -cmp. Change-Id: I2119f37f003368ce1884d2863b406d6ffbfe38c7 Reviewed-on: https://go-review.googlesource.com/21563Reviewed-by:
Matthew Dempsky <mdempsky@google.com>
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Brad Fitzpatrick authored
Also, don't read from the Request.Headers in the http Server code once ServeHTTP has started. This is partially redundant with documenting that handlers shouldn't mutate request, but: the space is free due to bool packing, it's faster to do the checks once instead of N times in writeChunk, and it's a little nicer to code which previously didn't play by the unwritten rules. But I'm not going to fix all the cases. Fixes #14940 Change-Id: I612a8826b41c8682b59515081c590c512ee6949e Reviewed-on: https://go-review.googlesource.com/21530 Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by:
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Brad Fitzpatrick authored
Change-Id: I9a8081ef1109469e9577c642156aa635188d8954 Reviewed-on: https://go-review.googlesource.com/21538 Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by:
Alex Brainman <alex.brainman@gmail.com>
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Brad Fitzpatrick authored
Fixes #15139 Change-Id: I73111137907e612af871b77ccf166572bf78c840 Reviewed-on: https://go-review.googlesource.com/21544Reviewed-by:
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- 05 Apr, 2016 28 commits
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Matthew Dempsky authored
go.go is currently a grab bag of various unrelated type and variable declarations. Move a bunch of them into other more relevant source files. There are still more that can be moved, but these were the low hanging fruit with obvious homes. No code/comment changes. Just shuffling stuff around. Change-Id: I43dbe1a5b8b707709c1a3a034c693d38b8465063 Reviewed-on: https://go-review.googlesource.com/21561 Run-TryBot: Matthew Dempsky <mdempsky@google.com> Reviewed-by:
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Matthew Dempsky authored
Change-Id: I301760b015eb69ff12eee53473fdbf5e9f168413 Reviewed-on: https://go-review.googlesource.com/21542Reviewed-by:
Robert Griesemer <gri@golang.org>
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Brad Fitzpatrick authored
Change-Id: Ia6ed49d5ef3a256a55e6d4eaa1b4d9f0fc447013 Reviewed-on: https://go-review.googlesource.com/21560Reviewed-by:
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Marcel van Lohuizen authored
This introduces a few changes - Skipped benchmarks now print a SKIP line, also if there was no output - The benchmark name is only printed if there the benchmark was not skipped or did not fail in the probe phase. It also fixes a bug of doubling a skip message in chatty mode in absense of a failure. The chatty flag is now passed in the common struct to allow for testing of the printed messages. Fixes #14799 Change-Id: Ia8eb140c2e5bb467e66b8ef20a2f98f5d95415d5 Reviewed-on: https://go-review.googlesource.com/21504Reviewed-by:
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Josh Bleecher Snyder authored
Pure code movement. Change-Id: Ia07ee0b0041c931b08adf090f262a6f74a6fdb01 Reviewed-on: https://go-review.googlesource.com/21546 Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com> Reviewed-by:
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Josh Bleecher Snyder authored
Before: ... 0x00d0 ff ff ff e8 00 00 00 00 e9 23 ff ff ff cc cc cc .........#...... rel 5+4 t=14 +0 rel 82+4 t=13 runtime.writeBarrier+0 ... After: ... 0x00d0 ff ff ff e8 00 00 00 00 e9 23 ff ff ff cc cc cc .........#...... rel 5+4 t=14 TLS+0 rel 82+4 t=13 runtime.writeBarrier+0 ... Change-Id: Ibdaf694581b5fd5fb87fa8ce6a792f3eb4493622 Reviewed-on: https://go-review.googlesource.com/21545Reviewed-by:
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Joe Tsai authored
CL/19862 introduced the same set of constants to the io package. We should steer users away from the os.SEEK* versions and towards the io.Seek* versions. Updates #6885 Change-Id: I96ec5be3ec3439e1295c937159dadaf1ebfb2737 Reviewed-on: https://go-review.googlesource.com/21540Reviewed-by:
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Robert Griesemer authored
I think we had this code before but it may have gone lost somehow. Change-Id: Ifde490e686de0d2bfe907cbe19c9197f24f5fa8e Reviewed-on: https://go-review.googlesource.com/21537Reviewed-by:
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David Chase authored
Missed a case for closure calls (OCALLFUNC && indirect) in esc.go:esccall. Cleanup to runtime code for windows to more thoroughly hide a technical escape. Also made code pickier about failing to late non-optional kernel32.dll. Fixes #14409. Change-Id: Ie75486a2c8626c4583224e02e4872c2875f7bca5 Reviewed-on: https://go-review.googlesource.com/20102 Run-TryBot: David Chase <drchase@google.com> Reviewed-by:
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Robert Griesemer authored
For PublicKey.P == 0, Verify will fail. Don't even try. Change-Id: I1009f2b3dead8d0041626c946633acb10086d8c8 Reviewed-on: https://go-review.googlesource.com/21533Reviewed-by:
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Brad Fitzpatrick authored
Fixes #14928 Change-Id: Id772eb623815cb2bb3e49de68a916762345a9dc1 Reviewed-on: https://go-review.googlesource.com/21531Reviewed-by:
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Dmitry Vyukov authored
Two GC-related functions, scang and casgstatus, wait in an active spin loop. Active spinning is never a good idea in user-space. Once we wait several times more than the expected wait time, something unexpected is happenning (e.g. the thread we are waiting for is descheduled or handling a page fault) and we need to yield to OS scheduler. Moreover, the expected wait time is very high for these functions: scang wait time can be tens of milliseconds, casgstatus can be hundreds of microseconds. It does not make sense to spin even for that time. go install -a std profile on a 4-core machine shows that 11% of time is spent in the active spin in scang: 6.12% compile compile [.] runtime.scang 3.27% compile compile [.] runtime.readgstatus 1.72% compile compile [.] runtime/internal/atomic.Load The active spin also increases tail latency in the case of the slightest oversubscription: GC goroutines spend whole quantum in the loop instead of executing user code. Here is scang wait time histogram during go install -a std: 13707.0000 - 1815442.7667 [ 118]: ∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎... 1815442.7667 - 3617178.5333 [ 9]: ∎∎∎∎∎∎∎∎∎ 3617178.5333 - 5418914.3000 [ 11]: ∎∎∎∎∎∎∎∎∎∎∎ 5418914.3000 - 7220650.0667 [ 5]: ∎∎∎∎∎ 7220650.0667 - 9022385.8333 [ 12]: ∎∎∎∎∎∎∎∎∎∎∎∎ 9022385.8333 - 10824121.6000 [ 13]: ∎∎∎∎∎∎∎∎∎∎∎∎∎ 10824121.6000 - 12625857.3667 [ 15]: ∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎ 12625857.3667 - 14427593.1333 [ 18]: ∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎ 14427593.1333 - 16229328.9000 [ 18]: ∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎ 16229328.9000 - 18031064.6667 [ 32]: ∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎ 18031064.6667 - 19832800.4333 [ 28]: ∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎ 19832800.4333 - 21634536.2000 [ 6]: ∎∎∎∎∎∎ 21634536.2000 - 23436271.9667 [ 15]: ∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎ 23436271.9667 - 25238007.7333 [ 11]: ∎∎∎∎∎∎∎∎∎∎∎ 25238007.7333 - 27039743.5000 [ 27]: ∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎ 27039743.5000 - 28841479.2667 [ 20]: ∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎ 28841479.2667 - 30643215.0333 [ 10]: ∎∎∎∎∎∎∎∎∎∎ 30643215.0333 - 32444950.8000 [ 7]: ∎∎∎∎∎∎∎ 32444950.8000 - 34246686.5667 [ 4]: ∎∎∎∎ 34246686.5667 - 36048422.3333 [ 4]: ∎∎∎∎ 36048422.3333 - 37850158.1000 [ 1]: ∎ 37850158.1000 - 39651893.8667 [ 5]: ∎∎∎∎∎ 39651893.8667 - 41453629.6333 [ 2]: ∎∎ 41453629.6333 - 43255365.4000 [ 2]: ∎∎ 43255365.4000 - 45057101.1667 [ 2]: ∎∎ 45057101.1667 - 46858836.9333 [ 1]: ∎ 46858836.9333 - 48660572.7000 [ 2]: ∎∎ 48660572.7000 - 50462308.4667 [ 3]: ∎∎∎ 50462308.4667 - 52264044.2333 [ 2]: ∎∎ 52264044.2333 - 54065780.0000 [ 2]: ∎∎ and the zoomed-in first part: 13707.0000 - 19916.7667 [ 2]: ∎∎ 19916.7667 - 26126.5333 [ 2]: ∎∎ 26126.5333 - 32336.3000 [ 9]: ∎∎∎∎∎∎∎∎∎ 32336.3000 - 38546.0667 [ 8]: ∎∎∎∎∎∎∎∎ 38546.0667 - 44755.8333 [ 12]: ∎∎∎∎∎∎∎∎∎∎∎∎ 44755.8333 - 50965.6000 [ 10]: ∎∎∎∎∎∎∎∎∎∎ 50965.6000 - 57175.3667 [ 5]: ∎∎∎∎∎ 57175.3667 - 63385.1333 [ 6]: ∎∎∎∎∎∎ 63385.1333 - 69594.9000 [ 5]: ∎∎∎∎∎ 69594.9000 - 75804.6667 [ 6]: ∎∎∎∎∎∎ 75804.6667 - 82014.4333 [ 6]: ∎∎∎∎∎∎ 82014.4333 - 88224.2000 [ 4]: ∎∎∎∎ 88224.2000 - 94433.9667 [ 1]: ∎ 94433.9667 - 100643.7333 [ 1]: ∎ 100643.7333 - 106853.5000 [ 2]: ∎∎ 106853.5000 - 113063.2667 [ 0]: 113063.2667 - 119273.0333 [ 2]: ∎∎ 119273.0333 - 125482.8000 [ 2]: ∎∎ 125482.8000 - 131692.5667 [ 1]: ∎ 131692.5667 - 137902.3333 [ 1]: ∎ 137902.3333 - 144112.1000 [ 0]: 144112.1000 - 150321.8667 [ 2]: ∎∎ 150321.8667 - 156531.6333 [ 1]: ∎ 156531.6333 - 162741.4000 [ 1]: ∎ 162741.4000 - 168951.1667 [ 0]: 168951.1667 - 175160.9333 [ 0]: 175160.9333 - 181370.7000 [ 1]: ∎ 181370.7000 - 187580.4667 [ 1]: ∎ 187580.4667 - 193790.2333 [ 2]: ∎∎ 193790.2333 - 200000.0000 [ 0]: Here is casgstatus wait time histogram: 631.0000 - 5276.6333 [ 3]: ∎∎∎ 5276.6333 - 9922.2667 [ 5]: ∎∎∎∎∎ 9922.2667 - 14567.9000 [ 2]: ∎∎ 14567.9000 - 19213.5333 [ 6]: ∎∎∎∎∎∎ 19213.5333 - 23859.1667 [ 5]: ∎∎∎∎∎ 23859.1667 - 28504.8000 [ 6]: ∎∎∎∎∎∎ 28504.8000 - 33150.4333 [ 6]: ∎∎∎∎∎∎ 33150.4333 - 37796.0667 [ 2]: ∎∎ 37796.0667 - 42441.7000 [ 1]: ∎ 42441.7000 - 47087.3333 [ 3]: ∎∎∎ 47087.3333 - 51732.9667 [ 0]: 51732.9667 - 56378.6000 [ 1]: ∎ 56378.6000 - 61024.2333 [ 0]: 61024.2333 - 65669.8667 [ 0]: 65669.8667 - 70315.5000 [ 0]: 70315.5000 - 74961.1333 [ 1]: ∎ 74961.1333 - 79606.7667 [ 0]: 79606.7667 - 84252.4000 [ 0]: 84252.4000 - 88898.0333 [ 0]: 88898.0333 - 93543.6667 [ 0]: 93543.6667 - 98189.3000 [ 0]: 98189.3000 - 102834.9333 [ 0]: 102834.9333 - 107480.5667 [ 1]: ∎ 107480.5667 - 112126.2000 [ 0]: 112126.2000 - 116771.8333 [ 0]: 116771.8333 - 121417.4667 [ 0]: 121417.4667 - 126063.1000 [ 0]: 126063.1000 - 130708.7333 [ 0]: 130708.7333 - 135354.3667 [ 0]: 135354.3667 - 140000.0000 [ 1]: ∎ Ideally we eliminate the waiting by switching to async state machine for GC, but for now just yield to OS scheduler after a reasonable wait time. To choose yielding parameters I've measured golang.org/x/benchmarks/http tail latencies with different yield delays and oversubscription levels. With no oversubscription (to the degree possible): scang yield delay = 1, casgstatus yield delay = 1 Latency-50 1.41ms ±15% 1.41ms ± 5% ~ (p=0.611 n=13+12) Latency-95 5.21ms ± 2% 5.15ms ± 2% -1.15% (p=0.012 n=13+13) Latency-99 7.16ms ± 2% 7.05ms ± 2% -1.54% (p=0.002 n=13+13) Latency-999 10.7ms ± 9% 10.2ms ±10% -5.46% (p=0.004 n=12+13) scang yield delay = 5000, casgstatus yield delay = 3000 Latency-50 1.41ms ±15% 1.41ms ± 8% ~ (p=0.511 n=13+13) Latency-95 5.21ms ± 2% 5.14ms ± 2% -1.23% (p=0.006 n=13+13) Latency-99 7.16ms ± 2% 7.02ms ± 2% -1.94% (p=0.000 n=13+13) Latency-999 10.7ms ± 9% 10.1ms ± 8% -6.14% (p=0.000 n=12+13) scang yield delay = 10000, casgstatus yield delay = 5000 Latency-50 1.41ms ±15% 1.45ms ± 6% ~ (p=0.724 n=13+13) Latency-95 5.21ms ± 2% 5.18ms ± 1% ~ (p=0.287 n=13+13) Latency-99 7.16ms ± 2% 7.05ms ± 2% -1.64% (p=0.002 n=13+13) Latency-999 10.7ms ± 9% 10.0ms ± 5% -6.72% (p=0.000 n=12+13) scang yield delay = 30000, casgstatus yield delay = 10000 Latency-50 1.41ms ±15% 1.51ms ± 7% +6.57% (p=0.002 n=13+13) Latency-95 5.21ms ± 2% 5.21ms ± 2% ~ (p=0.960 n=13+13) Latency-99 7.16ms ± 2% 7.06ms ± 2% -1.50% (p=0.012 n=13+13) Latency-999 10.7ms ± 9% 10.0ms ± 6% -6.49% (p=0.000 n=12+13) scang yield delay = 100000, casgstatus yield delay = 50000 Latency-50 1.41ms ±15% 1.53ms ± 6% +8.48% (p=0.000 n=13+12) Latency-95 5.21ms ± 2% 5.23ms ± 2% ~ (p=0.287 n=13+13) Latency-99 7.16ms ± 2% 7.08ms ± 2% -1.21% (p=0.004 n=13+13) Latency-999 10.7ms ± 9% 9.9ms ± 3% -7.99% (p=0.000 n=12+12) scang yield delay = 200000, casgstatus yield delay = 100000 Latency-50 1.41ms ±15% 1.47ms ± 5% ~ (p=0.072 n=13+13) Latency-95 5.21ms ± 2% 5.17ms ± 2% ~ (p=0.091 n=13+13) Latency-99 7.16ms ± 2% 7.02ms ± 2% -1.99% (p=0.000 n=13+13) Latency-999 10.7ms ± 9% 9.9ms ± 5% -7.86% (p=0.000 n=12+13) With slight oversubscription (another instance of http benchmark was running in background with reduced GOMAXPROCS): scang yield delay = 1, casgstatus yield delay = 1 Latency-50 840µs ± 3% 804µs ± 3% -4.37% (p=0.000 n=15+18) Latency-95 6.52ms ± 4% 6.03ms ± 4% -7.51% (p=0.000 n=18+18) Latency-99 10.8ms ± 7% 10.0ms ± 4% -7.33% (p=0.000 n=18+14) Latency-999 18.0ms ± 9% 16.8ms ± 7% -6.84% (p=0.000 n=18+18) scang yield delay = 5000, casgstatus yield delay = 3000 Latency-50 840µs ± 3% 809µs ± 3% -3.71% (p=0.000 n=15+17) Latency-95 6.52ms ± 4% 6.11ms ± 4% -6.29% (p=0.000 n=18+18) Latency-99 10.8ms ± 7% 9.9ms ± 6% -7.55% (p=0.000 n=18+18) Latency-999 18.0ms ± 9% 16.5ms ±11% -8.49% (p=0.000 n=18+18) scang yield delay = 10000, casgstatus yield delay = 5000 Latency-50 840µs ± 3% 823µs ± 5% -2.06% (p=0.002 n=15+18) Latency-95 6.52ms ± 4% 6.32ms ± 3% -3.05% (p=0.000 n=18+18) Latency-99 10.8ms ± 7% 10.2ms ± 4% -5.22% (p=0.000 n=18+18) Latency-999 18.0ms ± 9% 16.7ms ±10% -7.09% (p=0.000 n=18+18) scang yield delay = 30000, casgstatus yield delay = 10000 Latency-50 840µs ± 3% 836µs ± 5% ~ (p=0.442 n=15+18) Latency-95 6.52ms ± 4% 6.39ms ± 3% -2.00% (p=0.000 n=18+18) Latency-99 10.8ms ± 7% 10.2ms ± 6% -5.15% (p=0.000 n=18+17) Latency-999 18.0ms ± 9% 16.6ms ± 8% -7.48% (p=0.000 n=18+18) scang yield delay = 100000, casgstatus yield delay = 50000 Latency-50 840µs ± 3% 836µs ± 6% ~ (p=0.401 n=15+18) Latency-95 6.52ms ± 4% 6.40ms ± 4% -1.79% (p=0.010 n=18+18) Latency-99 10.8ms ± 7% 10.2ms ± 5% -4.95% (p=0.000 n=18+18) Latency-999 18.0ms ± 9% 16.5ms ±14% -8.17% (p=0.000 n=18+18) scang yield delay = 200000, casgstatus yield delay = 100000 Latency-50 840µs ± 3% 828µs ± 2% -1.49% (p=0.001 n=15+17) Latency-95 6.52ms ± 4% 6.38ms ± 4% -2.04% (p=0.001 n=18+18) Latency-99 10.8ms ± 7% 10.2ms ± 4% -4.77% (p=0.000 n=18+18) Latency-999 18.0ms ± 9% 16.9ms ± 9% -6.23% (p=0.000 n=18+18) With significant oversubscription (background http benchmark was running with full GOMAXPROCS): scang yield delay = 1, casgstatus yield delay = 1 Latency-50 1.32ms ±12% 1.30ms ±13% ~ (p=0.454 n=14+14) Latency-95 16.3ms ±10% 15.3ms ± 7% -6.29% (p=0.001 n=14+14) Latency-99 29.4ms ±10% 27.9ms ± 5% -5.04% (p=0.001 n=14+12) Latency-999 49.9ms ±19% 45.9ms ± 5% -8.00% (p=0.008 n=14+13) scang yield delay = 5000, casgstatus yield delay = 3000 Latency-50 1.32ms ±12% 1.29ms ± 9% ~ (p=0.227 n=14+14) Latency-95 16.3ms ±10% 15.4ms ± 5% -5.27% (p=0.002 n=14+14) Latency-99 29.4ms ±10% 27.9ms ± 6% -5.16% (p=0.001 n=14+14) Latency-999 49.9ms ±19% 46.8ms ± 8% -6.21% (p=0.050 n=14+14) scang yield delay = 10000, casgstatus yield delay = 5000 Latency-50 1.32ms ±12% 1.35ms ± 9% ~ (p=0.401 n=14+14) Latency-95 16.3ms ±10% 15.0ms ± 4% -7.67% (p=0.000 n=14+14) Latency-99 29.4ms ±10% 27.4ms ± 5% -6.98% (p=0.000 n=14+14) Latency-999 49.9ms ±19% 44.7ms ± 5% -10.56% (p=0.000 n=14+11) scang yield delay = 30000, casgstatus yield delay = 10000 Latency-50 1.32ms ±12% 1.36ms ±10% ~ (p=0.246 n=14+14) Latency-95 16.3ms ±10% 14.9ms ± 5% -8.31% (p=0.000 n=14+14) Latency-99 29.4ms ±10% 27.4ms ± 7% -6.70% (p=0.000 n=14+14) Latency-999 49.9ms ±19% 44.9ms ±15% -10.13% (p=0.003 n=14+14) scang yield delay = 100000, casgstatus yield delay = 50000 Latency-50 1.32ms ±12% 1.41ms ± 9% +6.37% (p=0.008 n=14+13) Latency-95 16.3ms ±10% 15.1ms ± 8% -7.45% (p=0.000 n=14+14) Latency-99 29.4ms ±10% 27.5ms ±12% -6.67% (p=0.002 n=14+14) Latency-999 49.9ms ±19% 45.9ms ±16% -8.06% (p=0.019 n=14+14) scang yield delay = 200000, casgstatus yield delay = 100000 Latency-50 1.32ms ±12% 1.42ms ±10% +7.21% (p=0.003 n=14+14) Latency-95 16.3ms ±10% 15.0ms ± 7% -7.59% (p=0.000 n=14+14) Latency-99 29.4ms ±10% 27.3ms ± 8% -7.20% (p=0.000 n=14+14) Latency-999 49.9ms ±19% 44.8ms ± 8% -10.21% (p=0.001 n=14+13) All numbers are on 8 cores and with GOGC=10 (http benchmark has tiny heap, few goroutines and low allocation rate, so by default GC barely affects tail latency). 10us/5us yield delays seem to provide a reasonable compromise and give 5-10% tail latency reduction. That's what used in this change. go install -a std results on 4 core machine: name old time/op new time/op delta Time 8.39s ± 2% 7.94s ± 2% -5.34% (p=0.000 n=47+49) UserTime 24.6s ± 2% 22.9s ± 2% -6.76% (p=0.000 n=49+49) SysTime 1.77s ± 9% 1.89s ±11% +7.00% (p=0.000 n=49+49) CpuLoad 315ns ± 2% 313ns ± 1% -0.59% (p=0.000 n=49+48) # %CPU MaxRSS 97.1ms ± 4% 97.5ms ± 9% ~ (p=0.838 n=46+49) # bytes Update #14396 Update #14189 Change-Id: I3f4109bf8f7fd79b39c466576690a778232055a2 Reviewed-on: https://go-review.googlesource.com/21503 Run-TryBot: Dmitry Vyukov <dvyukov@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by:
Rick Hudson <rlh@golang.org> Reviewed-by:
Austin Clements <austin@google.com>
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Dmitry Vyukov authored
Usleep(100) in runqgrab negatively affects latency and throughput of parallel application. We are sleeping instead of doing useful work. This is effect is particularly visible on windows where minimal sleep duration is 1-15ms. Reduce sleep from 100us to 3us and use osyield on windows. Sync chan send/recv takes ~50ns, so 3us gives us ~50x overshoot. benchmark old ns/op new ns/op delta BenchmarkChanSync-12 216 217 +0.46% BenchmarkChanSyncWork-12 27213 25816 -5.13% CPU consumption goes up from 106% to 108% in the first case, and from 107% to 125% in the second case. Test case from #14790 on windows: BenchmarkDefaultResolution-8 4583372 29720 -99.35% Benchmark1ms-8 992056 30701 -96.91% 99-th latency percentile for HTTP request serving is improved by up to 15% (see http://golang.org/cl/20835 for details). The following benchmarks are from the change that originally added this sleep (see https://golang.org/s/go15gomaxprocs): name old time/op new time/op delta Chain 22.6µs ± 2% 22.7µs ± 6% ~ (p=0.905 n=9+10) ChainBuf 22.4µs ± 3% 22.5µs ± 4% ~ (p=0.780 n=9+10) Chain-2 23.5µs ± 4% 24.9µs ± 1% +5.66% (p=0.000 n=10+9) ChainBuf-2 23.7µs ± 1% 24.4µs ± 1% +3.31% (p=0.000 n=9+10) Chain-4 24.2µs ± 2% 25.1µs ± 3% +3.70% (p=0.000 n=9+10) ChainBuf-4 24.4µs ± 5% 25.0µs ± 2% +2.37% (p=0.023 n=10+10) Powser 2.37s ± 1% 2.37s ± 1% ~ (p=0.423 n=8+9) Powser-2 2.48s ± 2% 2.57s ± 2% +3.74% (p=0.000 n=10+9) Powser-4 2.66s ± 1% 2.75s ± 1% +3.40% (p=0.000 n=10+10) Sieve 13.3s ± 2% 13.3s ± 2% ~ (p=1.000 n=10+9) Sieve-2 7.00s ± 2% 7.44s ±16% ~ (p=0.408 n=8+10) Sieve-4 4.13s ±21% 3.85s ±22% ~ (p=0.113 n=9+9) Fixes #14790 Change-Id: Ie7c6a1c4f9c8eb2f5d65ab127a3845386d6f8b5d Reviewed-on: https://go-review.googlesource.com/20835Reviewed-by:
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Ilya Tocar authored
We already generate ADDL for byte operations, reflect this in code. This also allows inc/dec for +-1 operation, which are 1-byte shorter, and enables lea for 3-operand addition/subtraction. Change-Id: Ibfdfee50667ca4cd3c28f72e3dece0c6d114d3ae Reviewed-on: https://go-review.googlesource.com/21251Reviewed-by:
Keith Randall <khr@golang.org> Run-TryBot: Ilya Tocar <ilya.tocar@intel.com> TryBot-Result: Gobot Gobot <gobot@golang.org>
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Augusto Roman authored
This CL allows JSON-encoding & -decoding maps whose keys are types that implement encoding.TextMarshaler / TextUnmarshaler. During encode, the map keys are marshaled upfront so that they can be sorted. Fixes #12146 Change-Id: I43809750a7ad82a3603662f095c7baf75fd172da Reviewed-on: https://go-review.googlesource.com/20356 Run-TryBot: Caleb Spare <cespare@gmail.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by:
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Eric Lagergren authored
Fixes #6885 Change-Id: I6907958186f6a2427da1ad2f6c20bd5d7bf7a3f9 Reviewed-on: https://go-review.googlesource.com/19862Reviewed-by:
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Alexandru Moșoi authored
Since BCE happens over several passes (opt, loopbce, prove) it's easy to regress especially with rewriting. The pass is only activated with special debug flag. Change-Id: I46205982e7a2751156db8e875d69af6138068f59 Reviewed-on: https://go-review.googlesource.com/21510 Run-TryBot: Alexandru Moșoi <alexandru@mosoi.ro> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by:
David Chase <drchase@google.com>
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Brad Fitzpatrick authored
Go 1.6's HTTP/1.x Transport started enforcing that responses have 3 status digits, per the spec, but we could still write out invalid status codes ourselves if the called ResponseWriter.WriteHeader(0). That is bogus anyway, since the minimum status code is 1xx, but be a little bit less bogus (and consistent) and zero pad our responses. Change-Id: I6883901fd95073cb72f6b74035cabf1a79c35e1c Reviewed-on: https://go-review.googlesource.com/19130 Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by:
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Dave Cheney authored
Fixes #15122 Change-Id: Ie2c802d78aea731e25bf4b193b3c2e4c884e0573 Reviewed-on: https://go-review.googlesource.com/21524 Run-TryBot: Dave Cheney <dave@cheney.net> Reviewed-by:
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David Symonds authored
Change-Id: If4e740f3dbef4053355542eebdd899b3099d872c Reviewed-on: https://go-review.googlesource.com/21525Reviewed-by:
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Paul Marks authored
This fixes a race which made it possible to cancel a connection after returning from net.Dial. Fixes #15035 Fixes #15078 Change-Id: Iec6215009538362f7ad9f408a33549f3e94d1606 Reviewed-on: https://go-review.googlesource.com/21497Reviewed-by:
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Alex Brainman authored
Fixes #15124 Change-Id: I55fe4c2957370f3fb417c3df54f99fb085a5dada Reviewed-on: https://go-review.googlesource.com/21522Reviewed-by:
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Alex Brainman authored
Fixes #15121 Change-Id: I651521743c56244c55eda5762905889d7e06887a Reviewed-on: https://go-review.googlesource.com/21521Reviewed-by:
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Alex Brainman authored
Fixes #15120 Change-Id: I1d9a192ac163826bad8b46e8c0b0b9e218e69570 Reviewed-on: https://go-review.googlesource.com/21520Reviewed-by:
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Brad Fitzpatrick authored
Currently only used by the client. The server is not yet wired up. A TODO remains to document how it works server-side, once implemented. Updates #14660 Change-Id: I27c2e74198872b2720995fa8271d91de200e23d5 Reviewed-on: https://go-review.googlesource.com/21496Reviewed-by:
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Alex Brainman authored
Fixes #15119 Change-Id: I31445bf282a5e2a160ff4e66c5a592b989a5798f Reviewed-on: https://go-review.googlesource.com/21448Reviewed-by:
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Hiroshi Ioka authored
Current implementation uses GetShortPathName and GetLongPathName to get a normalized path. That approach sometimes fails because user can disable short path name anytime. This CL provides an alternative approach suggested by MSDN. https://msdn.microsoft.com/en-us/library/windows/desktop/aa364989(v=vs.85).aspx Fixes #13980 Change-Id: Icf4afe4c9c4b507fc110c1483bf8db2c3f606b0a Reviewed-on: https://go-review.googlesource.com/20860Reviewed-by:
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Brad Fitzpatrick authored
This copies the golang.org/x/net/context package to the standard library. It is imported from the x/net repo's git rev 1d9fd3b8333e (the most recent modified to x/net/context as of 2016-03-07). The corresponding change to x/net/context is in https://golang.org/cl/20347 Updates #14660 Change-Id: Ida14b1b7e115194d6218d9ac614548b9f41641cc Reviewed-on: https://go-review.googlesource.com/20346Reviewed-by:
Sameer Ajmani <sameer@golang.org> Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
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- 04 Apr, 2016 3 commits
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Matthew Dempsky authored
Briefly document what the importfoo functions do. Get rid of importsym's unused result parameter. Get rid of the redundant calls to importsym(s, OTYPE) after we've already called pkgtype(s). Passes toolstash -cmp. Change-Id: I4c057358144044f5356e4dec68907ec85f1fe806 Reviewed-on: https://go-review.googlesource.com/21498 Run-TryBot: Matthew Dempsky <mdempsky@google.com> Reviewed-by:
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Mikio Hara authored
Also updates documentation. Change-Id: Idb0fc0feed61407f7f07eab81ce82b55ffde5040 Reviewed-on: https://go-review.googlesource.com/21446Reviewed-by:
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Mikio Hara authored
Alos moves TestTCPSelfConnect into tcpsock_test.go Change-Id: I3e1cbd029594ecb36a67f42bc3ecdbc7176a95dc Reviewed-on: https://go-review.googlesource.com/21447 Run-TryBot: Mikio Hara <mikioh.mikioh@gmail.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by:
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