Timer t = new Timer();
for (int l = 0; l < repeats; ++l) {
new CollectiveTask(payload).doAll(v); //same payload for all nodes
}
v.remove(new Futures()).blockForPending();
return (double) t.nanos() / repeats;
}
public boolean toHTML(StringBuilder sb) {
try {
sb.append("Origin: " + H2O.SELF._key);