Screeps Average CPU Usage Logging

logging.js

// If the CPU Usage logging is not defined, populate it with the first sample
var usedCpu = [];
if( Memory.cpuUsage === undefined ) {
  usedCpu = [ Game.getUsedCpu(), (new Date()).getTime() ];
  Memory.cpuUsage = {
    subSum: usedCpu[0],
    subSamples: [ usedCpu ],
    samples: [], // 10 minute samples
    average: 0,
    tickDuration: 3.0, // Aproximate value taken from field measurement
    lastSuperSample: 0,
    lastMegaSample: 0
  }
} else {
  var ticksFor5min = Math.round( 300 / Memory.cpuUsage.tickDuration );

  // Sum the CPU Usage
  usedCpu = [ Game.getUsedCpu(), (new Date()).getTime() ];
  Memory.cpuUsage.subSum += usedCpu[0];
  Memory.cpuUsage.subSamples.push( usedCpu );

  // Clear entries older than 5 minutes
  while ( Memory.cpuUsage.subSamples.length > ticksFor5min ) {
    Memory.cpuUsage.subSum -= Memory.cpuUsage.subSamples.shift()[0];
  }

  // Improve the average tick duration
  Memory.cpuUsage.tickDuration = (new Date()).getTime() - Memory.cpuUsage.subSamples[0][1];
  Memory.cpuUsage.tickDuration /= Memory.cpuUsage.subSamples.length * 1000;

  // Log samples based on the average for every 5 minute subsamping intervals
  if( Memory.cpuUsage.lastSuperSample + ticksFor5min <= Game.time ) {
    Memory.cpuUsage.lastSuperSample = Game.time;

    // Calculate new average
    Memory.cpuUsage.average *= Memory.cpuUsage.samples.length;
    var sample = Memory.cpuUsage.subSum / Memory.cpuUsage.subSamples.length;
    Memory.cpuUsage.average += sample;
    Memory.cpuUsage.samples.push( sample );

    // Remove old samples
    while ( Memory.cpuUsage.samples.length > 72 ) { // 6 hours
      Memory.cpuUsage.average -= Memory.cpuUsage.samples.shift();
    }

    Memory.cpuUsage.average /= Memory.cpuUsage.samples.length;

    // Reset subsamping
    usedCpu = [ Game.getUsedCpu(), (new Date()).getTime() ];
    Memory.cpuUsage.subSum = usedCpu[0];
    Memory.cpuUsage.subSamples = [ usedCpu ];

    // Every 6 hours email the user with the average CPU Usage
    var time = (new Date()).getTime();
    if( Memory.cpuUsage.lastMegaSample + 6 * 3600 * 1000 <= time ) {
      Memory.cpuUsage.lastMegaSample = time;
      Game.notify('Average CPU Usage for the last 6h as of ' + new Date() + ' was ' + (Memory.cpuUsage.average).toFixed(2) + 'ms. Game speed at the moment is: ' + (1 / Memory.cpuUsage.tickDuration).toFixed(2) + ' ticks/s.');
    }
  }
}