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string_decoder: optimize write() #1209
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,60 @@ | ||
var common = require('../common.js'); | ||
var StringDecoder = require('string_decoder').StringDecoder; | ||
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var bench = common.createBenchmark(main, { | ||
encoding: ['ascii', 'utf8', 'base64-utf8', 'base64-ascii'], | ||
inlen: [32, 128, 1024], | ||
chunk: [16, 64, 256, 1024], | ||
n: [25e4] | ||
}); | ||
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var UTF_ALPHA = 'Bl�b�rsyltet�y'; | ||
var ASC_ALPHA = 'Blueberry jam'; | ||
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function main(conf) { | ||
var encoding = conf.encoding; | ||
var inLen = conf.inlen | 0; | ||
var chunkLen = conf.chunk | 0; | ||
var n = conf.n | 0; | ||
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var alpha; | ||
var chunks = []; | ||
var str = ''; | ||
var isBase64 = (encoding === 'base64-ascii' || encoding === 'base64-utf8'); | ||
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if (encoding === 'ascii' || encoding === 'base64-ascii') | ||
alpha = ASC_ALPHA; | ||
else if (encoding === 'utf8' || encoding === 'base64-utf8') | ||
alpha = UTF_ALPHA; | ||
else | ||
throw new Error('Bad encoding'); | ||
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var sd = new StringDecoder(isBase64 ? 'base64' : encoding); | ||
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for (var i = 0; i < inLen; ++i) { | ||
if (i > 0 && (i % chunkLen) === 0 && !isBase64) { | ||
chunks.push(new Buffer(str, encoding)); | ||
str = ''; | ||
} | ||
str += alpha[i % alpha.length]; | ||
} | ||
if (str.length > 0 && !isBase64) | ||
chunks.push(new Buffer(str, encoding)); | ||
if (isBase64) { | ||
str = new Buffer(str, 'utf8').toString('base64'); | ||
while (str.length > 0) { | ||
var len = Math.min(chunkLen, str.length); | ||
chunks.push(new Buffer(str.substring(0, len), 'utf8')); | ||
str = str.substring(len); | ||
} | ||
} | ||
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var nChunks = chunks.length; | ||
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bench.start(); | ||
for (var i = 0; i < n; ++i) { | ||
for (var j = 0; j < nChunks; ++j) | ||
sd.write(chunks[j]); | ||
} | ||
bench.end(n); | ||
} |
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I wonder if V8 will unroll the subsequent loop (or if there's value in doing so ourselves.)
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You mean for the
i = 3
case? I didn't try that since I figured people would frown about code duplication between thei = 3
andi = buflen
cases. I also did not see what kind performance difference it would make though.