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buffer: improve toJSON() performance #10895

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mscdex
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@mscdex mscdex commented Jan 19, 2017

Here are the results with the new, included benchmarks (I used a different n value for each input length for best test result reliability while making sure they finished in a reasonable amount of time):

                                           improvement confidence      p.value
 buffers/buffer-tojson.js len=0 n=10000000   2449.70 %        *** 1.312673e-26
 buffers/buffer-tojson.js len=10 n=1000000   3148.31 %        *** 1.136735e-13
 buffers/buffer-tojson.js len=256 n=100000   2717.46 %        *** 1.418324e-21
 buffers/buffer-tojson.js len=4096 n=10000   3121.78 %        *** 2.456344e-12

CI: https://ci.nodejs.org/job/node-test-pull-request/5945/

Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • tests and/or benchmarks are included
  • commit message follows commit guidelines
Affected core subsystem(s)

@mscdex mscdex added buffer Issues and PRs related to the buffer subsystem. lts-watch-v4.x performance Issues and PRs related to the performance of Node.js. labels Jan 19, 2017
@nodejs-github-bot nodejs-github-bot added buffer Issues and PRs related to the buffer subsystem. lts-watch-v6.x labels Jan 19, 2017
});

function main(conf) {
var n = +conf.n;
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@fhalde fhalde Jan 19, 2017

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why not use let or const for n and buf to maintain consistency across the codebase

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Personally I'd rather just stick to var in benchmark code for the forseeable future. Having issues with let and const in node core code has left a bit of a "bad taste." While it might seem moot in benchmark code, I'd rather not have to worry about deopts making my benchmarks run unnecessarily longer.

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In addition to what @mscdex said, the current position on const/let over var is "only in code where performance doesn't matter". I'd say it makes more sense for benchmarks/ to be consistent with lib/ than test/.

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oh that was something new! Thanks!

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LGTM with a question

data: Array.prototype.slice.call(this, 0)
};
if (this.length) {
const data = [];
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Is this faster than using new Array(this.length)?

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It is until appropriate backports to V8 5.4 are made. I've just decided to go ahead and use this method. See this issue for more information.

data[i] = this[i];
return { type: 'Buffer', data };
} else {
return { type: 'Buffer', data: [] };
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Why the special case at all? The loop would run 0 times if length is 0, and you would get exactly the output you want. I doubt performance would be any different, would it?

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Unless the difference is really noticeable, I think I'd rather keep this simple and drop the if statement as @ronkorving said.

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@mscdex mscdex Jan 19, 2017

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There is a noticeable performance difference, otherwise I wouldn't have bothered. Without checking the IR explicitly, it probably has to do with setting up the loop or similar.

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lpinca commented Jan 23, 2017

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lpinca commented Jan 23, 2017

Landed in 9fcd842.

@lpinca lpinca closed this Jan 23, 2017
lpinca pushed a commit that referenced this pull request Jan 23, 2017
PR-URL: #10895
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Michal Zasso <targos@protonmail.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
italoacasas pushed a commit to italoacasas/node that referenced this pull request Jan 25, 2017
PR-URL: nodejs#10895
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Michal Zasso <targos@protonmail.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
@mscdex mscdex deleted the buffer-tojson-perf branch January 25, 2017 07:26
italoacasas pushed a commit to italoacasas/node that referenced this pull request Jan 27, 2017
PR-URL: nodejs#10895
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Michal Zasso <targos@protonmail.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
@italoacasas italoacasas mentioned this pull request Jan 29, 2017
italoacasas pushed a commit to italoacasas/node that referenced this pull request Jan 30, 2017
PR-URL: nodejs#10895
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Michal Zasso <targos@protonmail.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
italoacasas pushed a commit to italoacasas/node that referenced this pull request Jan 30, 2017
PR-URL: nodejs#10895
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Michal Zasso <targos@protonmail.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
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MylesBorins commented Mar 8, 2017

@mscdex how long do you think this should bake before we land it in LTS?

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mscdex commented Mar 8, 2017

@MylesBorins In general I don't have an opinion on such wait times, but this is definitely a pretty straight forward, simple change, so as far as I'm concerned it could be backported at any time.

MylesBorins pushed a commit that referenced this pull request Mar 8, 2017
PR-URL: #10895
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Michal Zasso <targos@protonmail.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
MylesBorins pushed a commit that referenced this pull request Mar 8, 2017
PR-URL: #10895
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Michal Zasso <targos@protonmail.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
MylesBorins pushed a commit that referenced this pull request Mar 9, 2017
PR-URL: #10895
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Michal Zasso <targos@protonmail.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
@MylesBorins MylesBorins mentioned this pull request Mar 9, 2017
MylesBorins pushed a commit that referenced this pull request Mar 9, 2017
PR-URL: #10895
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Michal Zasso <targos@protonmail.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
@MylesBorins MylesBorins mentioned this pull request Mar 9, 2017
MylesBorins added a commit that referenced this pull request Mar 21, 2017
Notable changes

* performance: The performance of several APIs has been improved.
  - `Buffer.compare()` is up to 35% faster on average. (Brian White)
    #10927
  - `buffer.toJSON()` is up to 2859% faster on average. (Brian White)
    #10895
  - `fs.*statSync()` functions are now up to 9.3% faster on average.
    (Brian White) #11522
  - `os.loadavg` is up to 151% faster. (Brian White)
    #11516
  - `process.memoryUsage()` is up to 34% faster. (Brian White)
    #11497
  - `querystring.unescape()` for `Buffer`s is 15% faster on average.
    (Brian White) #10837
  - `querystring.stringify()` is up to 7.8% faster on average.
    (Brian White) #10852
  - `querystring.parse()` is up to 21% faster on average. (Brian White)
    #10874

* IPC:
  - Batched writes have been enabled for process IPC on platforms that
    support Unix Domain Sockets. (Alexey Orlenko)
    #10677
  - Performance gains may be up to 40% for some workloads.

* child_process:
  - `spawnSync` now returns a null `status` when child is terminated by
    a signal. (cjihrig) #11288
  - This fixes the behavior to act like `spawn()` does.

* http:
  - Control characters are now always rejected when using
    `http.request()`. (Ben Noordhuis)
    #8923
  - Debug messages have been added for cases when headers contain
    invalid values. (Evan Lucas)
    #9195

* node:
  - Heap statistics now support values larger than 4GB. (Ben Noordhuis)
    #10186

* timers:
  - Timer callbacks now always maintain order when interacting with
    domain error handling. (John Barboza)
    #10522

PR-URL: #11759
MylesBorins added a commit that referenced this pull request Mar 21, 2017
Notable Changes:

* buffer:
  - The performance of `.toJSON()` is now up to 2859% faster on average
    (Brian White) #10895

* IPC:
  - Batched writes have been enabled for process IPC on platforms that
    support Unix Domain Sockets. (Alexey Orlenko)
    #10677
  - Performance gains may be up to 40% for some workloads.

* http:
  - Control characters are now always rejected when using
    `http.request()`. (Ben Noordhuis)
    #8923

* node:
  - Heap statistics now support values larger than 4GB. (Ben Noordhuis)
    #10186
MylesBorins added a commit that referenced this pull request Mar 21, 2017
Notable Changes:

* buffer:
  - The performance of `.toJSON()` is now up to 2859% faster on average
    (Brian White) #10895

* IPC:
  - Batched writes have been enabled for process IPC on platforms that
    support Unix Domain Sockets. (Alexey Orlenko)
    #10677
  - Performance gains may be up to 40% for some workloads.

* http:
  - Control characters are now always rejected when using
    `http.request()`. (Ben Noordhuis)
    #8923

* node:
  - Heap statistics now support values larger than 4GB. (Ben Noordhuis)
    #10186

PR-URL: #11760
MylesBorins added a commit that referenced this pull request Mar 21, 2017
Notable changes

* performance: The performance of several APIs has been improved.
  - `Buffer.compare()` is up to 35% faster on average. (Brian White)
    #10927
  - `buffer.toJSON()` is up to 2859% faster on average. (Brian White)
    #10895
  - `fs.*statSync()` functions are now up to 9.3% faster on average.
    (Brian White) #11522
  - `os.loadavg` is up to 151% faster. (Brian White)
    #11516
  - `process.memoryUsage()` is up to 34% faster. (Brian White)
    #11497
  - `querystring.unescape()` for `Buffer`s is 15% faster on average.
    (Brian White) #10837
  - `querystring.stringify()` is up to 7.8% faster on average.
    (Brian White) #10852
  - `querystring.parse()` is up to 21% faster on average. (Brian White)
    #10874

* IPC:
  - Batched writes have been enabled for process IPC on platforms that
    support Unix Domain Sockets. (Alexey Orlenko)
    #10677
  - Performance gains may be up to 40% for some workloads.

* child_process:
  - `spawnSync` now returns a null `status` when child is terminated by
    a signal. (cjihrig) #11288
  - This fixes the behavior to act like `spawn()` does.

* http:
  - Control characters are now always rejected when using
    `http.request()`. (Ben Noordhuis)
    #8923
  - Debug messages have been added for cases when headers contain
    invalid values. (Evan Lucas)
    #9195

* node:
  - Heap statistics now support values larger than 4GB. (Ben Noordhuis)
    #10186

* timers:
  - Timer callbacks now always maintain order when interacting with
    domain error handling. (John Barboza)
    #10522

PR-URL: #11759
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2.5 thousand percent!
🥇

imyller added a commit to imyller/meta-nodejs that referenced this pull request Apr 20, 2017
    Notable Changes:

    * buffer:
      - The performance of `.toJSON()` is now up to 2859% faster on average
        (Brian White) nodejs/node#10895

    * IPC:
      - Batched writes have been enabled for process IPC on platforms that
        support Unix Domain Sockets. (Alexey Orlenko)
        nodejs/node#10677
      - Performance gains may be up to 40% for some workloads.

    * http:
      - Control characters are now always rejected when using
        `http.request()`. (Ben Noordhuis)
        nodejs/node#8923

    * node:
      - Heap statistics now support values larger than 4GB. (Ben Noordhuis)
        nodejs/node#10186

Signed-off-by: Ilkka Myller <ilkka.myller@nodefield.com>
imyller added a commit to imyller/meta-nodejs that referenced this pull request Apr 20, 2017
    Notable changes

    * performance: The performance of several APIs has been improved.
      - `Buffer.compare()` is up to 35% faster on average. (Brian White)
        nodejs/node#10927
      - `buffer.toJSON()` is up to 2859% faster on average. (Brian White)
        nodejs/node#10895
      - `fs.*statSync()` functions are now up to 9.3% faster on average.
        (Brian White) nodejs/node#11522
      - `os.loadavg` is up to 151% faster. (Brian White)
        nodejs/node#11516
      - `process.memoryUsage()` is up to 34% faster. (Brian White)
        nodejs/node#11497
      - `querystring.unescape()` for `Buffer`s is 15% faster on average.
        (Brian White) nodejs/node#10837
      - `querystring.stringify()` is up to 7.8% faster on average.
        (Brian White) nodejs/node#10852
      - `querystring.parse()` is up to 21% faster on average. (Brian White)
        nodejs/node#10874

    * IPC:
      - Batched writes have been enabled for process IPC on platforms that
        support Unix Domain Sockets. (Alexey Orlenko)
        nodejs/node#10677
      - Performance gains may be up to 40% for some workloads.

    * child_process:
      - `spawnSync` now returns a null `status` when child is terminated by
        a signal. (cjihrig) nodejs/node#11288
      - This fixes the behavior to act like `spawn()` does.

    * http:
      - Control characters are now always rejected when using
        `http.request()`. (Ben Noordhuis)
        nodejs/node#8923
      - Debug messages have been added for cases when headers contain
        invalid values. (Evan Lucas)
        nodejs/node#9195

    * node:
      - Heap statistics now support values larger than 4GB. (Ben Noordhuis)
        nodejs/node#10186

    * timers:
      - Timer callbacks now always maintain order when interacting with
        domain error handling. (John Barboza)
        nodejs/node#10522

    PR-URL: nodejs/node#11759

Signed-off-by: Ilkka Myller <ilkka.myller@nodefield.com>
imyller added a commit to imyller/meta-nodejs that referenced this pull request Apr 20, 2017
    Notable Changes:

    * buffer:
      - The performance of `.toJSON()` is now up to 2859% faster on average
        (Brian White) nodejs/node#10895

    * IPC:
      - Batched writes have been enabled for process IPC on platforms that
        support Unix Domain Sockets. (Alexey Orlenko)
        nodejs/node#10677
      - Performance gains may be up to 40% for some workloads.

    * http:
      - Control characters are now always rejected when using
        `http.request()`. (Ben Noordhuis)
        nodejs/node#8923

    * node:
      - Heap statistics now support values larger than 4GB. (Ben Noordhuis)
        nodejs/node#10186

Signed-off-by: Ilkka Myller <ilkka.myller@nodefield.com>
imyller added a commit to imyller/meta-nodejs that referenced this pull request Apr 20, 2017
    Notable changes

    * performance: The performance of several APIs has been improved.
      - `Buffer.compare()` is up to 35% faster on average. (Brian White)
        nodejs/node#10927
      - `buffer.toJSON()` is up to 2859% faster on average. (Brian White)
        nodejs/node#10895
      - `fs.*statSync()` functions are now up to 9.3% faster on average.
        (Brian White) nodejs/node#11522
      - `os.loadavg` is up to 151% faster. (Brian White)
        nodejs/node#11516
      - `process.memoryUsage()` is up to 34% faster. (Brian White)
        nodejs/node#11497
      - `querystring.unescape()` for `Buffer`s is 15% faster on average.
        (Brian White) nodejs/node#10837
      - `querystring.stringify()` is up to 7.8% faster on average.
        (Brian White) nodejs/node#10852
      - `querystring.parse()` is up to 21% faster on average. (Brian White)
        nodejs/node#10874

    * IPC:
      - Batched writes have been enabled for process IPC on platforms that
        support Unix Domain Sockets. (Alexey Orlenko)
        nodejs/node#10677
      - Performance gains may be up to 40% for some workloads.

    * child_process:
      - `spawnSync` now returns a null `status` when child is terminated by
        a signal. (cjihrig) nodejs/node#11288
      - This fixes the behavior to act like `spawn()` does.

    * http:
      - Control characters are now always rejected when using
        `http.request()`. (Ben Noordhuis)
        nodejs/node#8923
      - Debug messages have been added for cases when headers contain
        invalid values. (Evan Lucas)
        nodejs/node#9195

    * node:
      - Heap statistics now support values larger than 4GB. (Ben Noordhuis)
        nodejs/node#10186

    * timers:
      - Timer callbacks now always maintain order when interacting with
        domain error handling. (John Barboza)
        nodejs/node#10522

    PR-URL: nodejs/node#11759

Signed-off-by: Ilkka Myller <ilkka.myller@nodefield.com>
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