public static boolean isRestartRecommended(
ProcessingUnit pu,
Machine source,
Machine target,
Fraction optimalCpuCoresPerPrimary,
CapacityRequirementsPerAgent allocatedCapacity) {
boolean isRestartRecommended = false;
final int numberOfPrimaryInstancesOnSource = getNumberOfPrimaryInstancesOnMachine(pu, source);
if (numberOfPrimaryInstancesOnSource > 0) {
final int numberOfPrimaryInstancesOnTarget = getNumberOfPrimaryInstancesOnMachine(pu, target);
Fraction cpuCoresOnSource = getNumberOfCpuCores(source, allocatedCapacity);
Fraction cpuCoresOnTarget = getNumberOfCpuCores(target, allocatedCapacity);
final Fraction missingCpuCoresBeforeRestart =
max(
Fraction.ZERO,
optimalCpuCoresPerPrimary
.multiply(numberOfPrimaryInstancesOnSource)
.subtract(cpuCoresOnSource))
.add(
max(
Fraction.ZERO,
optimalCpuCoresPerPrimary
.multiply(numberOfPrimaryInstancesOnTarget)
.subtract(cpuCoresOnTarget)));
final Fraction missingCpuCoresAfterRestart =
max(
Fraction.ZERO,
optimalCpuCoresPerPrimary
.multiply(numberOfPrimaryInstancesOnSource - 1)
.subtract(cpuCoresOnSource))
.add(
max(
Fraction.ZERO,
optimalCpuCoresPerPrimary
.multiply(numberOfPrimaryInstancesOnTarget + 1)
.subtract(cpuCoresOnTarget)));
isRestartRecommended =
missingCpuCoresAfterRestart.compareTo(missingCpuCoresBeforeRestart) < 0;
}
return isRestartRecommended;
}
private static Fraction max(Fraction a, Fraction b) {
if (b.compareTo(a) > 0) {
return b;
}
return a;
}