mon2.setObservedAttribute(attr);
mon2.setDifferenceMode(true);
check(attr,server,mon2n,mbean);
final long approxStart = System.currentTimeMillis();
mon1.start();
mon2.start();
try {
check(attr,server,mon1n,mbean,approxStart);
check(attr,server,mon2n,mbean,approxStart);