/**
* Calculate and store the initial/static alpha of the coflow (in bytes)
*
* @param numRacks number of racks in the trace
* @param deadlineMult deadline duration multiplier
*/
private void calcAlphaDeadline(int numRacks, double deadlineMult) {
// Calculate Alpha
double[] sendBytes = new double[numRacks];
Arrays.fill(sendBytes, 0.0);
double[] recvBytes = new double[numRacks];
Arrays.fill(recvBytes, 0.0);
double perMapperBytes = totalShuffleBytes / numMappers;
for (Task t : tasks) {
if (t.taskType == TaskType.MAPPER) {
MapTask mt = (MapTask) t;
sendBytes[mt.taskID] += perMapperBytes;
}
if (t.taskType == TaskType.REDUCER) {
ReduceTask rt = (ReduceTask) t;
recvBytes[rt.taskID] += rt.shuffleBytes;
}
}
alpha = Math.max(Utils.max(sendBytes), Utils.max(recvBytes));
// Calculate deadline in millis
deadlineDuration = alpha / Constants.RACK_BYTES_PER_SEC * deadlineMult * 1000;
try {
writeDebugDataToFile();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* Determine the remaining size of the coflow.
*
* @return the number of bytes remaining of this coflow.
*/
public double calcShuffleBytesLeft() {
return Utils.sum(shuffleBytesPerRack);
}