http: optimize checkIsHttpToken() and checkInvalidHeaderChar() #6570

mscdex · 2016-05-04T15:44:50Z

Checklist

tests and code linting passes
the commit message follows commit guidelines

Affected core subsystem(s)

http

Description of change

This PR optimizes checkIsHttpToken() by:

Reducing the source code size to allow it to be inlinable with default v8 settings
Tweaking the order of the conditionals a bit to optimize for common cases.
Moving the character checking logic to a separate inlinable function to allow the main function to permit some loop unrolling.

checkInvalidHeaderChar() is also optimized by moving the character checking logic to a separate inlinable function to allow the main function to permit some loop unrolling.

The results from the existing check_is_http_token benchmark are (with the iterations bumped up to 5e8):

http/check_is_http_token.js key=TCN n=500000000: ./node: 80661000 ./node-master: 76596000 .................... 5.31%
http/check_is_http_token.js key=ETag n=500000000: ./node: 68376000 ./node-master: 59987000 .................. 13.98%
http/check_is_http_token.js key=date n=500000000: ./node: 77423000 ./node-master: 59011000 .................. 31.20%
http/check_is_http_token.js key=Vary n=500000000: ./node: 71596000 ./node-master: 59517000 .................. 20.30%
http/check_is_http_token.js key=server n=500000000: ./node: 86029000 ./node-master: 41288000 ............... 108.36%
http/check_is_http_token.js key=Server n=500000000: ./node: 82373000 ./node-master: 43516000 ................ 89.29%
http/check_is_http_token.js key=status n=500000000: ./node: 86021000 ./node-master: 43569000 ................ 97.43%
http/check_is_http_token.js key=version n=500000000: ./node: 66875000 ./node-master: 38341000 ............... 74.42%
http/check_is_http_token.js key=Expires n=500000000: ./node: 68358000 ./node-master: 36367000 ............... 87.97%
http/check_is_http_token.js key=alt-svc n=500000000: ./node: 60369000 ./node-master: 35545000 ............... 69.84%
http/check_is_http_token.js key=location n=500000000: ./node: 54662000 ./node-master: 34359000 .............. 59.09%
http/check_is_http_token.js key=Connection n=500000000: ./node: 41642000 ./node-master: 25207000 ............ 65.20%
http/check_is_http_token.js key=Keep-Alive n=500000000: ./node: 36692000 ./node-master: 27106000 ............ 35.36%
http/check_is_http_token.js key=content-type n=500000000: ./node: 29480000 ./node-master: 20660000 .......... 42.69%
http/check_is_http_token.js key=Content-Type n=500000000: ./node: 28407000 ./node-master: 22059000 .......... 28.77%
http/check_is_http_token.js key=Cache-Control n=500000000: ./node: 26861000 ./node-master: 19907000 ......... 34.93%
http/check_is_http_token.js key=Last-Modified n=500000000: ./node: 25668000 ./node-master: 19906000 ......... 28.95%
http/check_is_http_token.js key=Accept-Ranges n=500000000: ./node: 26276000 ./node-master: 18999000 ......... 38.30%
http/check_is_http_token.js key=content-length n=500000000: ./node: 22521000 ./node-master: 18320000 ........ 22.93%
http/check_is_http_token.js key=x-frame-options n=500000000: ./node: 19494000 ./node-master: 16385000 ....... 18.97%
http/check_is_http_token.js key=x-xss-protection n=500000000: ./node: 18531000 ./node-master: 14178000 ...... 30.71%
http/check_is_http_token.js key=Content-Encoding n=500000000: ./node: 21053000 ./node-master: 15840000 ...... 32.91%
http/check_is_http_token.js key=Content-Location n=500000000: ./node: 21052000 ./node-master: 15485000 ...... 35.95%
http/check_is_http_token.js key=Transfer-Encoding n=500000000: ./node: 19648000 ./node-master: 14687000 ..... 33.78%
http/check_is_http_token.js key=alternate-protocol n=500000000: ./node: 16859000 ./node-master: 13820000 .... 21.98%
http/check_is_http_token.js key=: n=500000000: ./node: 201910000 ./node-master: 105210000 ................... 91.92%
http/check_is_http_token.js key=@@ n=500000000: ./node: 201910000 ./node-master: 104490000 .................. 93.23%
http/check_is_http_token.js key=中文呢 n=500000000: ./node: 185510000 ./node-master: 101830000 ............... 82.18%
http/check_is_http_token.js key=((((()))) n=500000000: ./node: 316610000 ./node-master: 103700000 .......... 205.32%
http/check_is_http_token.js key=:alternate-protocol n=500000000: ./node: 202710000 ./node-master: 103840000 . 95.21%
http/check_is_http_token.js key=alternate-protocol: n=500000000: ./node: 16225000 ./node-master: 12317000 ... 31.73%

The results from the new check_invalid_header_char benchmark are:

http/check_invalid_header_char.js key="" n="500000000": ./node: 589640000 ./node-master: 605710000 ............................................................................................................ -2.65%
http/check_invalid_header_char.js key="1" n="500000000": ./node: 159060000 ./node-master: 156190000 ............................................................................................................ 1.83%
http/check_invalid_header_char.js key="\t\t\t\t\t\t\t\t\t\tFoo bar baz" n="500000000": ./node: 14964000 ./node-master: 11644000 ............................................................................... 28.51%
http/check_invalid_header_char.js key="keep-alive" n="500000000": ./node: 41767000 ./node-master: 24943000 .................................................................................................... 67.45%
http/check_invalid_header_char.js key="close" n="500000000": ./node: 108590000 ./node-master: 54515000 ........................................................................................................ 99.18%
http/check_invalid_header_char.js key="gzip" n="500000000": ./node: 83603000 ./node-master: 66625000 .......................................................................................................... 25.48%
http/check_invalid_header_char.js key="20091" n="500000000": ./node: 58258000 ./node-master: 56457000 .......................................................................................................... 3.19%
http/check_invalid_header_char.js key="private" n="500000000": ./node: 68037000 ./node-master: 39502000 ....................................................................................................... 72.24%
http/check_invalid_header_char.js key="text/html; charset=utf-8" n="500000000": ./node: 12537000 ./node-master: 10960000 ...................................................................................... 14.39%
http/check_invalid_header_char.js key="text/plain" n="500000000": ./node: 41925000 ./node-master: 24940000 .................................................................................................... 68.10%
http/check_invalid_header_char.js key="Sat, 07 May 2016 16:54:48 GMT" n="500000000": ./node: 10075000 ./node-master: 9243500 ................................................................................... 9.00%
http/check_invalid_header_char.js key="SAMEORIGIN" n="500000000": ./node: 40381000 ./node-master: 24941000 .................................................................................................... 61.91%
http/check_invalid_header_char.js key="en-US" n="500000000": ./node: 110410000 ./node-master: 54398000 ....................................................................................................... 102.97%
http/check_invalid_header_char.js key="Here is a value that is really a folded header value\r\n  this should be      supported, but it is not currently" n="500000000": ./node: 5479200 ./node-master: 5359200 . 2.24%
http/check_invalid_header_char.js key="中文呢" n="500000000": ./node: 533970000 ./node-master: 280280000 ....................................................................................................... 90.51%
http/check_invalid_header_char.js key="foo\nbar" n="500000000": ./node: 182810000 ./node-master: 70721000 .................................................................................................... 158.49%
http/check_invalid_header_char.js key="�" n="500000000": ./node: 468570000 ./node-master: 294120000 ........................................................................................................... 59.31%

mscdex · 2016-05-04T15:47:14Z

CI: https://ci.nodejs.org/job/node-test-commit/3177/

Fishrock123 · 2016-05-04T15:48:35Z

Is this something we should do any sort of linting for so that we maintain it? Or add a comment?

Fishrock123 · 2016-05-04T15:49:01Z

Aside: has anyone looked into if these v8 settings would be better tweaked by node by default?

jasnell · 2016-05-04T15:52:47Z

Code comments would be good (outside of the function ;-) ...)
Otherwise LGTM

mscdex · 2016-05-04T15:53:27Z

I can add a comment I suppose. I'm not sure if there is an inline eslint comment we can add to enforce function code size or not.

As far as changing the default max_inlined_source_size, I think I trust v8 to use a reasonable default value here. If you increase it too much, you could actually end up with lower performing code (and larger compiled code size).

mscdex · 2016-05-04T15:57:39Z

Comment added.

ChALkeR · 2016-05-04T16:47:08Z

lib/_http_common.js

-    var ch = val.charCodeAt(i);
-
+    const ch = val.charCodeAt(i);
+    if (ch >= 94 && ch <= 122) // a-z


94-122 is not a-z, it's ^_`a-z

Fishrock123 · 2016-05-04T16:51:40Z

I'm not sure if there is an inline eslint comment we can add to enforce function code size or not.

I think you can do /* eslint-enable: ... */ then /* eslint-disable: ... */ ... I'll try to look into this, it can probably detect function size with a custom plugin.

jasnell · 2016-05-06T17:41:28Z

Thanks @mscdex. Still LGTM.

mscdex · 2016-05-07T06:24:11Z

I think I may have found something that improves performance quite a bit more for every case, so do not merge yet.

mscdex · 2016-05-07T21:33:41Z

Ok, I've pushed new changes. In addition to the dramatically better performance of checkIsHttpToken(), I have also significantly increased the performance of checkInvalidHeaderChar().

mscdex · 2016-05-07T21:49:57Z

CI again: https://ci.nodejs.org/job/node-test-pull-request/2531/

ChALkeR · 2016-05-08T07:39:59Z

lib/_http_common.js

+    return false;
+  if (ch >= 33 && ch <= 46)
+    return true;
+  if (ch === 124 || ch === 126)


Ok, now that this is split in two methods, are there still reasons to omit the comment here? This is // | ~

I've now added the valid character list in the comment preceding the function instead of documenting them inline.

ChALkeR · 2016-05-08T07:44:12Z

@mscdex Perhaps renaming ch to c in isValidTokenChar would help to keep the list of chars in comments?

jasnell · 2016-05-08T15:02:44Z

@mscdex ... very nice.

bnoordhuis · 2016-05-08T16:34:28Z

lib/_http_common.js

        return false;
-      continue;
+      if (len > 3) {


Isn't this the common case? Can you quantify how much the manual loop unrolling helps?

I didn't save the old results, but there was a lesser performance improvement with the pure loop implementation. I can run it again without and post the results here.

Ok here are the results with just the loop, no unrolling:

http/check_is_http_token.js key="TCN" n="500000000": ./node: 73576000 ./node-master: 76945000 ................... -4.38% http/check_is_http_token.js key="ETag" n="500000000": ./node: 60694000 ./node-master: 59833000 ................... 1.44% http/check_is_http_token.js key="date" n="500000000": ./node: 71346000 ./node-master: 59617000 .................. 19.68% http/check_is_http_token.js key="Vary" n="500000000": ./node: 64590000 ./node-master: 58538000 .................. 10.34% http/check_is_http_token.js key="server" n="500000000": ./node: 49815000 ./node-master: 43208000 ................ 15.29% http/check_is_http_token.js key="Server" n="500000000": ./node: 44101000 ./node-master: 42926000 ................. 2.74% http/check_is_http_token.js key="status" n="500000000": ./node: 49805000 ./node-master: 43655000 ................ 14.09% http/check_is_http_token.js key="version" n="500000000": ./node: 43245000 ./node-master: 37774000 ............... 14.48% http/check_is_http_token.js key="Expires" n="500000000": ./node: 39172000 ./node-master: 37568000 ................ 4.27% http/check_is_http_token.js key="alt-svc" n="500000000": ./node: 38508000 ./node-master: 35600000 ................ 8.17% http/check_is_http_token.js key="location" n="500000000": ./node: 38132000 ./node-master: 34186000 .............. 11.54% http/check_is_http_token.js key="Connection" n="500000000": ./node: 26488000 ./node-master: 24878000 ............. 6.47% http/check_is_http_token.js key="Keep-Alive" n="500000000": ./node: 29028000 ./node-master: 27224000 ............. 6.63% http/check_is_http_token.js key="content-type" n="500000000": ./node: 23468000 ./node-master: 21554000 ........... 8.88% http/check_is_http_token.js key="Content-Type" n="500000000": ./node: 24507000 ./node-master: 23320000 ........... 5.09% http/check_is_http_token.js key="Cache-Control" n="500000000": ./node: 22685000 ./node-master: 19883000 ......... 14.09% http/check_is_http_token.js key="Last-Modified" n="500000000": ./node: 22605000 ./node-master: 19911000 ......... 13.53% http/check_is_http_token.js key="Accept-Ranges" n="500000000": ./node: 22516000 ./node-master: 19637000 ......... 14.66% http/check_is_http_token.js key="content-length" n="500000000": ./node: 20171000 ./node-master: 18336000 ........ 10.01% http/check_is_http_token.js key="x-frame-options" n="500000000": ./node: 18221000 ./node-master: 16510000 ....... 10.36% http/check_is_http_token.js key="x-xss-protection" n="500000000": ./node: 16391000 ./node-master: 14117000 ...... 16.11% http/check_is_http_token.js key="Content-Encoding" n="500000000": ./node: 18711000 ./node-master: 16602000 ...... 12.70% http/check_is_http_token.js key="Content-Location" n="500000000": ./node: 18612000 ./node-master: 16531000 ...... 12.59% http/check_is_http_token.js key="Transfer-Encoding" n="500000000": ./node: 17713000 ./node-master: 15734000 ..... 12.58% http/check_is_http_token.js key="alternate-protocol" n="500000000": ./node: 14988000 ./node-master: 14720000 ..... 1.82% http/check_is_http_token.js key=":" n="500000000": ./node: 155200000 ./node-master: 108860000 ................... 42.57% http/check_is_http_token.js key="@@" n="500000000": ./node: 151200000 ./node-master: 109090000 .................. 38.60% http/check_is_http_token.js key="中文呢" n="500000000": ./node: 138090000 ./node-master: 101780000 ............... 35.67% http/check_is_http_token.js key="((((())))" n="500000000": ./node: 184100000 ./node-master: 105320000 ........... 74.80% http/check_is_http_token.js key=":alternate-protocol" n="500000000": ./node: 141000000 ./node-master: 103870000 . 35.75% http/check_is_http_token.js key="alternate-protocol:" n="500000000": ./node: 14917000 ./node-master: 11983000 ... 24.49%

PR-URL: nodejs#6570 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

PR-URL: nodejs#6570 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl> Reviewed-By: Сковорода Никита Андреевич <chalkerx@gmail.com>

PR-URL: nodejs#6570 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

AndreasMadsen · 2016-06-15T16:53:25Z

@mscdex not converting benchmark arguments to integers breaks some benchmarks. For example after applying c570182 ./node benchmark/common.js http chunked will fail with:

http/chunked.js
buffer.js:150
    throw err;
    ^

TypeError: "size" argument must be a number
    at Function.Buffer.alloc (buffer.js:159:3)
    at Benchmark.main [as fn] (/Users/Andreas/GitHub/node/benchmark/http/chunked.js:21:22)
    at Benchmark._run (/Users/Andreas/GitHub/node/benchmark/common.js:139:17)
    at /Users/Andreas/GitHub/node/benchmark/common.js:96:10
    at _combinedTickCallback (internal/process/next_tick.js:67:7)
    at process._tickCallback (internal/process/next_tick.js:98:9)
    at Module.runMain (module.js:577:11)
    at run (node.js:340:7)
    at startup (node.js:132:9)
    at node.js:455:3
child process exited with code 1

AndreasMadsen · 2016-06-15T17:03:56Z

@mscdex not calling process.exit(0) after bench.report() will break some benchmarks. For example after applying 83432bf ./node benchmark/common.js dgram array-vs-concat will stall after the first configurations.

dgram/array-vs-concat.js
dgram/array-vs-concat.js len="64" num="100" chunks="1" type="concat" dur="5": 0.06249
^C -- it never completes

In my bechmark refactor #7094 I have added process.exit(0) to all the benchmark that requires it, see db93461

This commit both makes checkIsHttpToken() inlinable and extracts the character checking logic to a separate inlinable function so that the main loop can be unrolled a bit. PR-URL: #6570 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl> Reviewed-By: Сковорода Никита Андреевич <chalkerx@gmail.com>

This commit optimizes checkInvalidHeaderChar() by unrolling the character checking loop a bit. Additionally, some changes to the benchmark runner are needed in order for the included benchmark to be run correctly. Specifically, the regexp used to parse `key=value` parameters contained a greedy quantifier that was causing the `key` to match part of the `value` if `value` contained an equals sign. PR-URL: #6570 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl> Reviewed-By: Сковорода Никита Андреевич <chalkerx@gmail.com>

PR-URL: #6570 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

PR-URL: #6570 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl> Reviewed-By: Сковорода Никита Андреевич <chalkerx@gmail.com>

PR-URL: #6570 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

MylesBorins · 2016-07-11T23:02:48Z

@mscdex lts?

mscdex · 2016-07-11T23:23:07Z

@thealphanerd Possibly, but #7311 is a related followup PR that would need to be landed and backported at the same time, since it fixes existing benchmarks due to the benchmark changes included in this PR.

MylesBorins · 2016-07-11T23:30:14Z

@mscdex I'll hold off then. Please tag the other as lts-watch and consider sending them together as a backport

MylesBorins · 2016-08-30T18:44:24Z

@mscdex thoughts on this now? Would you be up for submitting a backport

MylesBorins · 2016-10-10T16:26:30Z

@mscdex I'm going to opt not to land this on v4.x. Please feel free to submit a backport if you feel it should land

mscdex added http Issues or PRs related to the http subsystem. performance Issues and PRs related to the performance of Node.js. labels May 4, 2016

mscdex force-pushed the http-common-perf-checkhttptoken branch from 4961e40 to c7329a3 Compare May 4, 2016 15:46

mscdex force-pushed the http-common-perf-checkhttptoken branch from c7329a3 to bb208d9 Compare May 4, 2016 15:57

ChALkeR reviewed May 4, 2016
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mscdex force-pushed the http-common-perf-checkhttptoken branch from bb208d9 to 1d7b821 Compare May 4, 2016 16:52

mscdex added the wip Issues and PRs that are still a work in progress. label May 7, 2016

mscdex force-pushed the http-common-perf-checkhttptoken branch from 1d7b821 to ac4c6d0 Compare May 7, 2016 21:22

mscdex changed the title ~~http: allow checkIsHttpToken to be inlinable~~ http: optimize checkIsHttpToken() and checkInvalidHeaderChar() May 7, 2016

mscdex removed the wip Issues and PRs that are still a work in progress. label May 7, 2016

mscdex force-pushed the http-common-perf-checkhttptoken branch from ac4c6d0 to 9044655 Compare May 7, 2016 21:48

ChALkeR reviewed May 8, 2016
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bnoordhuis reviewed May 8, 2016
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mscdex force-pushed the http-common-perf-checkhttptoken branch from 9044655 to 3feadd8 Compare May 8, 2016 20:35

mscdex added 3 commits June 14, 2016 15:13

benchmark: increase http token check iterations

39fdf07

PR-URL: nodejs#6570 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

test: add more http token/value checking tests

c8fa79f

PR-URL: nodejs#6570 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl> Reviewed-By: Сковорода Никита Андреевич <chalkerx@gmail.com>

benchmark: don't convert arguments to numbers

c570182

PR-URL: nodejs#6570 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

mscdex force-pushed the http-common-perf-checkhttptoken branch from ed7d020 to c570182 Compare June 14, 2016 19:13

mscdex merged commit c570182 into nodejs:master Jun 14, 2016

mscdex deleted the http-common-perf-checkhttptoken branch June 14, 2016 19:14

AndreasMadsen mentioned this pull request Jun 15, 2016

Refactor benchmark tools for statistical significance #7094

Merged

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evanlucas pushed a commit that referenced this pull request Jun 16, 2016

benchmark: increase http token check iterations

32f7698

PR-URL: #6570 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

evanlucas pushed a commit that referenced this pull request Jun 16, 2016

benchmark: don't convert arguments to numbers

d71ede8

PR-URL: #6570 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

evanlucas mentioned this pull request Jun 16, 2016

v6.2.2 proposal #7323

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MylesBorins mentioned this pull request Jul 11, 2016

Audit commits not found on v4.x-staging #7661

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MylesBorins added the lts-watch-v4.x label Jul 11, 2016

MylesBorins added dont-land-on-v4.x and removed lts-watch-v4.x labels Oct 10, 2016

mcollina mentioned this pull request Sep 6, 2017

Reduce the numbers of iterations in benchmarkshttp/check_is_http_token #15218

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http: optimize checkIsHttpToken() and checkInvalidHeaderChar() #6570

http: optimize checkIsHttpToken() and checkInvalidHeaderChar() #6570

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