Node.js Millisecond Timeout

Output on OS X Snow Leopard

$ node timers.js 
setInterval(ƒ,1) -> (µs) :
 [ 1477,
  1172,
  1071,
  1084,
  1122,
  1145,
  1064,
  1062,
  1094,
  1130,
  1125,
  1125,
  1125,
  1124,
  1123,
  1124,
  1129,
  1123,
  1094,
  1124,
  1089,
  1125,
  1157,
  1185,
  1150,
  1159,
  1156,
  1167,
  1148,
  1146,
  1148,
  1147,
  1154,
  1148,
  1062,
  1145,
  1091,
  1138,
  1123,
  1115,
  1118,
  1156,
  1167,
  1116,
  1107,
  1123,
  1123,
  1125,
  1123,
  1056,
  1130,
  1131,
  1125,
  1129,
  1123,
  1125,
  1124,
  1123,
  1123,
  1124,
  1124,
  1124,
  1130,
  1077,
  1165,
  1138,
  1127,
  1060,
  1124,
  1124,
  1086,
  1138,
  1123,
  1124,
  1124,
  1089,
  1121,
  1029,
  1114,
  1098,
  1136,
  1156,
  1149,
  1085,
  1114,
  1145,
  1147,
  1074,
  1094,
  1153,
  1149,
  1109,
  1122,
  1124,
  1124,
  1058,
  1128,
  1145,
  1146 ]
setTimeout(ƒ,2) -> (µs) :
 [ 11948,
  5510,
  2412,
  2238,
  2177,
  2220,
  2247,
  2256,
  2215,
  2223,
  2236,
  2244,
  2226,
  2264,
  2131,
  2149,
  2084,
  2116,
  2206,
  2164,
  2263,
  2256,
  2207,
  2163,
  2227,
  2226,
  2226,
  3470,
  2223,
  2239,
  2174,
  2267,
  2224,
  2252,
  3716,
  2239,
  2286,
  2133,
  2220,
  2234,
  2229,
  2255,
  2225,
  2274,
  2614,
  2396,
  2242,
  2244,
  2268,
  3232,
  2249,
  2186,
  2152,
  2247,
  2229,
  2244,
  2172,
  2227,
  3283,
  2228,
  2237,
  2226,
  3247,
  2255,
  2178,
  2188,
  2884,
  2712,
  2211,
  2215,
  3170,
  2288,
  2266,
  2228,
  3241,
  2217,
  2214,
  2248,
  3235,
  2252,
  2236,
  2244,
  3238,
  2241,
  2252,
  2148,
  2225,
  2128,
  2233,
  2221,
  2243,
  3231,
  2209,
  2234,
  2241,
  3244,
  2255,
  2206,
  2183 ]
setTimeout(ƒ,1) -> (µs) :
 [ 5898,
  367,
  26,
  7,
  4,
  10,
  3,
  3,
  3,
  3,
  3,
  9,
  3,
  3,
  3,
  3,
  3,
  8,
  3,
  3,
  3,
  3,
  8,
  3,
  3,
  3,
  3,
  8,
  3,
  5,
  304,
  5,
  13,
  10,
  3657,
  33,
  5,
  5,
  4,
  4,
  4,
  12,
  5,
  4,
  11,
  5,
  5,
  12,
  4,
  7,
  9,
  3,
  3,
  8,
  4,
  3,
  3,
  3,
  3,
  8,
  3,
  3,
  3,
  3,
  3,
  10,
  146,
  81,
  4,
  12,
  3,
  3,
  3,
  3,
  3,
  8,
  3,
  3,
  3,
  3,
  3,
  3,
  8,
  3,
  3,
  3,
  8,
  3,
  3,
  3,
  3,
  3,
  8,
  3,
  3,
  3,
  2157,
  14,
  4 ]
setTimeout(ƒ,0) -> (µs) :
 [ 1663,
  2608,
  12,
  3,
  11,
  3,
  3,
  3,
  3,
  3,
  8,
  3,
  3,
  3,
  3,
  3,
  8,
  3,
  3,
  7,
  3,
  3,
  8,
  3,
  3,
  3,
  2,
  3,
  8,
  3,
  5,
  3,
  2,
  2,
  8,
  3,
  2,
  3,
  2,
  2,
  3,
  8,
  3,
  3,
  3,
  2,
  8,
  3,
  2,
  3,
  3,
  3,
  8,
  3,
  3,
  2,
  2,
  2,
  7,
  3,
  2,
  3,
  2,
  2,
  5,
  3,
  7,
  3,
  2,
  2,
  2,
  8,
  3,
  3,
  3,
  5,
  3,
  8,
  3,
  3,
  4,
  3,
  2,
  4,
  3,
  4,
  3,
  2,
  8,
  3,
  3,
  2,
  3,
  3,
  7,
  3,
  5,
  3,
  3 ]
nextTick(ƒ) -> (µs) :
 [ 1131,
  65,
  21,
  18,
  11,
  2,
  4,
  2,
  1,
  3,
  2,
  2,
  3,
  2,
  1,
  3,
  2,
  2,
  3,
  2,
  7,
  3,
  2,
  1,
  3,
  2,
  2,
  3,
  2,
  2,
  3,
  2,
  2,
  3,
  2,
  2,
  3,
  2,
  1,
  4,
  2,
  1,
  3,
  2,
  2,
  3,
  5,
  2,
  3,
  2,
  2,
  3,
  2,
  1,
  8,
  2,
  1,
  3,
  2,
  1,
  3,
  2,
  2,
  3,
  2,
  1,
  3,
  2,
  1,
  3,
  2,
  1,
  8,
  2,
  1,
  3,
  2,
  2,
  3,
  2,
  2,
  3,
  2,
  2,
  3,
  7,
  2,
  3,
  2,
  1,
  3,
  2,
  3,
  3,
  2,
  1,
  3,
  2,
  2 ]

timers.js

//[email protected] 2012-11-04

var epoch = process.hrtime();
var howMany= 99;

interval();

function interval () {
  var intervals = [], interval = setInterval(function () {
    if (intervals.length < howMany) {
      intervals.push(µs(process.hrtime(epoch))); 
      epoch = process.hrtime();
    } else {
      clearInterval(interval);
      //console.log(intervals.slice(intervals.length - 4));
      console.log("setInterval(ƒ,1) -> (µs) :\n", intervals);
      timeout(2, function () { timeout(1, function () { timeout(0, tick) }) });
    }
  }, 1);
}

function timeout (wait, callback) {
  var setTimeouts = [];
  function timeout () {
    if (setTimeouts.length < howMany) {
      setTimeouts.push(µs(process.hrtime(epoch))); 
      epoch = process.hrtime();
      setTimeout(timeout, wait);
    } else {
      console.log("setTimeout(ƒ,"+ wait+ ") -> (µs) :\n", setTimeouts);
      callback();
    }
  }
  timeout();
}

var nextTicks = [];
function tick () {
  if (nextTicks.length < howMany) {
    nextTicks.push(µs(process.hrtime(epoch))); 
    epoch = process.hrtime();
    process.nextTick(tick);
  } else {
    console.log("nextTick(ƒ) -> (µs) :\n", nextTicks);
  }
}

function µs (t) {
  return Math.round(t[1]/1e3);
}