Created
July 13, 2010 22:15
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var fs = require('fs'); | |
var Buffer = require('buffer').Buffer; | |
var path = "/tmp/wt.dat"; | |
var tsize = 2000 * 1048578; | |
var bsizes = [1024, 4096, 8192, 16384, 32768, 65536]; | |
function bufit(size) { | |
var buf = new Buffer(size); | |
for (var i = 0; i <buf.length ; i += 1) { | |
buf[i] = 33; | |
} | |
return buf; | |
} | |
function once(emitter, name, cb) { | |
function incb() { | |
cb.apply(undefined, arguments); | |
emitter.removeListener(name, incb); | |
} | |
emitter.addListener(name, incb); | |
} | |
function writetest(size, bsize) { | |
var s = fs.createWriteStream(path, {'flags': 'w', 'encoding': 'binary', 'mode': 0644}); | |
var remaining = size; | |
var buf = bufit(bsize); | |
function dowrite() { | |
var rv = s.write(buf, 'binary'); | |
if (rv === false) { | |
once(s, 'drain', function() { | |
dowrite(); | |
}); | |
} | |
remaining -= buf.length; | |
if (remaining > 0) { | |
process.nextTick(dowrite); | |
} | |
else { | |
s.emit('done') | |
s.end(); | |
} | |
} | |
dowrite(); | |
return s; | |
} | |
function readtest(size, bsize) { | |
var s = fs.createReadStream(path, {'flags': 'r', 'encoding': 'binary', 'mode': 0644, 'bufferSize': bsize}); | |
s.addListener("data", function (chunk) { | |
// got a chunk... | |
}); | |
return s; | |
} | |
function wt(tsize, bsize, done) { | |
var start = Date.now(); | |
s = writetest(tsize, bsizes[0]); | |
s.addListener('close', function() { | |
var end = Date.now(); | |
var diff = end - start; | |
console.log('Wrote '+ tsize +' bytes in '+ diff +'ms using '+ bsize +' byte buffers: '+ ((tsize/(diff/1000)) / 1048578) +' mB/s'); | |
done(); | |
}); | |
} | |
function rt(tsize, bsize, done) { | |
var start = Date.now(); | |
s = readtest(tsize, bsizes[0]); | |
s.addListener('close', function() { | |
var end = Date.now(); | |
var diff = end - start; | |
console.log('Read '+ tsize +' bytes in '+ diff +'ms using '+ bsize +' byte buffers: '+ ((tsize/(diff/1000)) / 1048578) +' mB/s'); | |
done(); | |
}); | |
} | |
var bs= 0; | |
function nextwt() { | |
if (bsizes.length <= bs) { | |
bs = 0; | |
nextrt(); | |
return; | |
} | |
wt(tsize, bsizes[bs], nextwt); | |
bs += 1; | |
} | |
function nextrt() { | |
if (bsizes.length <= bs) { | |
fs.unlink(path, function (err) { | |
if (err) throw err; | |
console.log('All done!'); | |
}); | |
return; | |
} | |
rt(tsize, bsizes[bs], nextrt); | |
bs += 1; | |
} | |
nextwt(); |
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