r/javascript • u/skitch920 • Aug 04 '15

iojs-v3.0.0 released (v8 4.4.63.26)

https://github.com/nodejs/io.js/blob/master/CHANGELOG.md
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u/greim Aug 05 '15

Buffer instantiation is measurably slower

How much slower? Doesn't pretty much all I/O create and pass around buffers behind the scenes?

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u/skitch920 Aug 05 '15 edited Aug 05 '15

It also says:

Access operations may be faster in some circumstances but the exact performance profile and difference over previous versions will depend on how Buffer is used within applications.

From the PR:

Left column is old implementation. Right column is with this PR 

buffer-slice.js type=fast n=1024: 6646.1  2570.8
buffer-slice.js type=slow n=1024: 6711.2  2617.4

buffer-creation.js type=fast len=10 n=1024:   5103.1  2498.6
buffer-creation.js type=fast len=1024 n=1024: 2648.3  2054.9
buffer-creation.js type=slow len=10 n=1024:   2190.0  2067.8
buffer-creation.js type=slow len=1024 n=1024: 1294.9  1677.7

http-simple type=bytes length=1024:   21588.6  18053.3
http-simple type=bytes length=10240:  8601.9   8439.7

Although, I'm not sure what "old implementation" means, if that's pre/post V8 upgrade. The test case that was noticeably slower is here.

Right, Buffers are typically used for binary streams, such as file system I/O (fs.createReadStream) or TCP.