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buffer: optimize decoding wrapped base64 data #12146

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buffer: optimize decoding wrapped base64 data #12146

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aqrln
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@aqrln aqrln commented Mar 31, 2017 •
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The fast base64 decoder used to switch to the slow one permanently when
it saw a whitespace or other garbage character. Since the most common
situation such characters may be encountered in is line-wrapped base64
data, a more profitable strategy is to decode a single 24-bit group with
the slow decoder and then continue running the fast algorithm.

Refs: #12114

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)

buffer

@nodejs-github-bot nodejs-github-bot added buffer Issues and PRs related to the buffer subsystem. c++ Issues and PRs that require attention from people who are familiar with C++. labels Mar 31, 2017
@aqrln
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aqrln commented Mar 31, 2017

I haven't run the whole benchmark suite yet, only symlinked the exiting and the new benchmarks into a new directory locally:

                                             improvement confidence      p.value
 base64/buffer-base64-decode-wrapped.js n=32     11.04 %        *** 4.413651e-27
 base64/buffer-base64-decode.js n=32             -1.49 %            5.613341e-02

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@Fishrock123
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CI: https://ci.nodejs.org/job/node-test-pull-request/7140/

jasnell
jasnell reviewed Mar 31, 2017
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benchmark/buffers/buffer-base64-decode-wrapped.js Outdated
// eslint-disable-next-line no-unescaped-regexp-dot
data.match(/./); // Flatten the string
const buffer = Buffer.allocUnsafe(bytesCount);
buffer.write(data, 0, bytesCount, 'base64');
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minor nit but this can be simplified just a bit by doing...

const line = 'abcd'.repeat(charsPerLine / 4) + '\n';
const buffer = Buffer.alloc(bytesCount, line);

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Done. Thanks for the suggestion!

@aqrln
buffer: optimize decoding wrapped base64 data
ff77c72 
The fast base64 decoder used to switch to the slow one permanently when
it saw a whitespace or other garbage character.  Since the most common
situation such characters may be encountered in is line-wrapped base64
data, a more profitable strategy is to decode a single 24-bit group with
the slow decoder and then continue running the fast algorithm.

Refs: nodejs#12114
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aqrln commented Mar 31, 2017

Rebased to incorporate changes from #11995.

addaleax
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Thank you!

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aqrln commented Apr 4, 2017

Can I get a fresh CI run?

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CI: https://ci.nodejs.org/job/node-test-pull-request/7192/

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not sure I'm qualified to sign off on this but LGTM

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aqrln commented Apr 4, 2017 •
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/cc @bnoordhuis (based on Git history)

jasnell
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This LGTM but it would be really nice to have some cctests for this header file

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jasnell commented Apr 4, 2017

(to be clear, the cctest can be added separately :-) ...)

jasnell pushed a commit that referenced this pull request Apr 4, 2017
@aqrln @jasnell
buffer: optimize decoding wrapped base64 data
e77a83f 
The fast base64 decoder used to switch to the slow one permanently when
it saw a whitespace or other garbage character.  Since the most common
situation such characters may be encountered in is line-wrapped base64
data, a more profitable strategy is to decode a single 24-bit group with
the slow decoder and then continue running the fast algorithm.

PR-URL: #12146
Ref: #12114
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Trevor Norris <trev.norris@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
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jasnell commented Apr 4, 2017

Landed in e77a83f

@jasnell jasnell closed this Apr 4, 2017
@aqrln aqrln deleted the base64-optimization branch April 4, 2017 16:46
@jasnell jasnell mentioned this pull request Apr 4, 2017
Closed
aqrln added a commit to aqrln/node that referenced this pull request Apr 5, 2017
@aqrln
test: add basic cctest for base64.h
3c48697 
This commit adds C++ tests for `base64_encode()` and `base64_decode()`
functions defined in `base64.h`.  The functionality is already being
tested indirectly in JavaScript tests for Buffer, but it won't hurt to
test the low-level functions too, especially given that they aren't only
used in the internal Buffer implementation, Chrome inspector protocol
support relies upon them too.

Refs: nodejs#12146 (comment)
@aqrln aqrln mentioned this pull request Apr 5, 2017
Closed
3 tasks
aqrln added a commit that referenced this pull request Apr 8, 2017
@aqrln
test: add basic cctest for base64.h
b03f1f0 
This commit adds C++ tests for `base64_encode()` and `base64_decode()`
functions defined in `base64.h`.  The functionality is already being
tested indirectly in JavaScript tests for Buffer, but it won't hurt to
test the low-level functions too, especially given that they aren't only
used in the internal Buffer implementation, Chrome inspector protocol
support relies upon them too.

PR-URL: #12238
Refs: #12146 (comment)
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>
italoacasas pushed a commit to italoacasas/node that referenced this pull request Apr 10, 2017
@aqrln @italoacasas
buffer: optimize decoding wrapped base64 data
805ebef 
The fast base64 decoder used to switch to the slow one permanently when
it saw a whitespace or other garbage character.  Since the most common
situation such characters may be encountered in is line-wrapped base64
data, a more profitable strategy is to decode a single 24-bit group with
the slow decoder and then continue running the fast algorithm.

PR-URL: nodejs#12146
Ref: nodejs#12114
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Trevor Norris <trev.norris@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
@italoacasas italoacasas mentioned this pull request Apr 10, 2017
Merged
2 tasks
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should we backport?

Assuming if so we should wait a bit

@MylesBorins MylesBorins added the baking-for-lts PRs that need to wait before landing in a LTS release. label May 15, 2017
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should we backport?

It seems to be the root cause of #13657, so no.

@addaleax addaleax added dont-land-on-v4.x and removed baking-for-lts PRs that need to wait before landing in a LTS release. lts-watch-v6.x labels Jun 13, 2017
gibfahn pushed a commit that referenced this pull request Jun 18, 2017
@aqrln @gibfahn
test: add basic cctest for base64.h
f7abf36 
This commit adds C++ tests for `base64_encode()` and `base64_decode()`
functions defined in `base64.h`.  The functionality is already being
tested indirectly in JavaScript tests for Buffer, but it won't hurt to
test the low-level functions too, especially given that they aren't only
used in the internal Buffer implementation, Chrome inspector protocol
support relies upon them too.

PR-URL: #12238
Refs: #12146 (comment)
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>
gibfahn pushed a commit that referenced this pull request Jun 20, 2017
@aqrln @gibfahn
test: add basic cctest for base64.h
003a485 
This commit adds C++ tests for `base64_encode()` and `base64_decode()`
functions defined in `base64.h`.  The functionality is already being
tested indirectly in JavaScript tests for Buffer, but it won't hurt to
test the low-level functions too, especially given that they aren't only
used in the internal Buffer implementation, Chrome inspector protocol
support relies upon them too.

PR-URL: #12238
Refs: #12146 (comment)
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>
MylesBorins pushed a commit that referenced this pull request Jul 11, 2017
@aqrln @MylesBorins
test: add basic cctest for base64.h
19d9551 
This commit adds C++ tests for `base64_encode()` and `base64_decode()`
functions defined in `base64.h`.  The functionality is already being
tested indirectly in JavaScript tests for Buffer, but it won't hurt to
test the low-level functions too, especially given that they aren't only
used in the internal Buffer implementation, Chrome inspector protocol
support relies upon them too.

PR-URL: #12238
Refs: #12146 (comment)
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>
@aqrln aqrln mentioned this pull request Jul 21, 2017
Merged
3 tasks
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@addaleax addaleax addaleax approved these changes

@jasnell jasnell jasnell approved these changes

@trevnorris trevnorris trevnorris approved these changes

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