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var fs = require('fs');
var util = require('util');
var Buffer = require('buffer').Buffer;
var path = "/tmp/wt.dat";
var tsize = 1000 * 1048576;
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);
}
c = 0
function writetest(size, bsize) {
var s = fs.createWriteStream(path, {'flags': 'w', 'mode': 0644});
var remaining = size;
var buf = bufit(bsize);
function dowrite() {
var rv = s.write(buf);
remaining -= buf.length;
if (remaining > 0) {
//if (remaining % 90000 == 0) console.error("remaining: %d", remaining);
//process.nextTick(dowrite);
} else {
s.emit('done')
s.end();
}
}
s.on('drain', function () {
dowrite();
if (c++ % 2000 == 0) util.print(".");
});
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/1000 +'s using '+ bsize +' byte buffers: '+ ((tsize/(diff/1000)) / 1048576) +' 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/1000 +'s using '+ bsize +' byte buffers: '+ ((tsize/(diff/1000)) / 1048576) +' 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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