comparing performance of fs.readSync() with that of fs.read()

sync_async_fs.coffee

N = 100000
READ_SIZE = 100
fs = require "fs"

fd = fs.openSync __filename, "r"

i = 0
console.time "sync"

while i < N
  fs.readSync fd, new Buffer(100), 0 , READ_SIZE, 0
  i++

console.timeEnd "sync"

i = 0
console.time "async_chain"

fn = ->
  fs.read fd, new Buffer(100), 0 , READ_SIZE, 0, ->
    i++
    if i < N
      fn()
    else
      console.timeEnd "async_chain"
      async_aside()
fn()

async_aside = ->
  console.time "async_aside"
  i = 0
  results = 0
  while i < N
    fs.read fd, new Buffer(100), 0 , READ_SIZE, 0, ->
      results++
      if results is N
        console.timeEnd "async_aside"
    i++

sync: 210ms
async_chain: 1870ms
async_aside: 1671ms

Unfortunate results.....