buffer: little improve for Buffer.concat method #1437
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When buffer list less than 2, no need to calculate the length. The change's benchmark result is here: https://gist.github.com/JacksonTian/2c9e2bdec00018e010e6 It improve 15% ~ 25% speed when list only have one buffer, to other cases no effect.
| if (list.length === 0) | ||
| return new Buffer(0); | ||
| else if (list.length === 1) | ||
| return list[0]; |
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By the way, should we follow the below assertions:
assert.equal(Buffer.cancat(anyArray, len).length, len);
however
assert.equal(Buffer.cancat([], 1).length, 1); // this line would fail
assert.equal(Buffer.concat([new Buffer(20)]).length, 10); this line would fail as well and importantly i think we need to cut the buffer to 10.
@JacksonTian I know this should not be related to your patch, but it would be great if this is able to be fixed(bug? unsure) :p though cc @trevnorris
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Thanks @yorkie for bringing that up. Let's address that issue in another PR and keep this one simple.
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LGTM |
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LGTM. Thanks. |
brendanashworth
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Apr 23, 2015
When buffer list less than 2, no need to calculate the length. The change's benchmark result is here: https://gist.github.com/JacksonTian/2c9e2bdec00018e010e6 It improve 15% ~ 25% speed when list only have one buffer, to other cases no effect. PR-URL: #1437 Reviewed-By: Trevor Norris <[email protected]> Reviewed-By: Brendan Ashworth <[email protected]>
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LGTM. Thanks @JacksonTian, merged in |
Fishrock123
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May 19, 2015
When buffer list less than 2, no need to calculate the length. The change's benchmark result is here: https://gist.github.com/JacksonTian/2c9e2bdec00018e010e6 It improve 15% ~ 25% speed when list only have one buffer, to other cases no effect. PR-URL: nodejs#1437 Reviewed-By: Trevor Norris <[email protected]> Reviewed-By: Brendan Ashworth <[email protected]>
ChALkeR
added
the
performance
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When buffer list less than 2, no need to calculate the length.
The change's benchmark result is here:
https://gist.github.com/JacksonTian/2c9e2bdec00018e010e6
It improve 15% ~ 25% speed when list only have one buffer,
to other cases no effect.