perf-test.js

var fs = require('fs')

for (var i = 0; i < 10000; i++) {
  printLength(__filename)
}

function printLength (filename) {
  fs.readFile(filename, foo)

  function foo (err, buf)  {
    if (err) return // ignore error - probably just too many fds
    console.error(filename + ' has length ' + buf.length)
  }
}

So, I (slightly) adapted this test for a micro benchmark. It just got a massive bump (7 times faster) on V8 master (We sped this up a while ago but behind a flag, flag is on by default now).

This should be in the V8-Node integration build in a few hours. I'll retry on the original Node example then.