/**
* Gets the sla metrics.
*
* @param vms the vms
* @return the sla metrics
*/
protected static Map<String, Double> getSlaMetrics(List<Vm> vms) {
Map<String, Double> metrics = new HashMap<String, Double>();
List<Double> slaViolation = new LinkedList<Double>();
double totalAllocated = 0;
double totalRequested = 0;
double totalUnderAllocatedDueToMigration = 0;
for (Vm vm : vms) {
double vmTotalAllocated = 0;
double vmTotalRequested = 0;
double vmUnderAllocatedDueToMigration = 0;
double previousTime = -1;
double previousAllocated = 0;
double previousRequested = 0;
boolean previousIsInMigration = false;
for (VmStateHistoryEntry entry : vm.getStateHistory()) {
if (previousTime != -1) {
double timeDiff = entry.getTime() - previousTime;
vmTotalAllocated += previousAllocated * timeDiff;
vmTotalRequested += previousRequested * timeDiff;
if (previousAllocated < previousRequested) {
slaViolation.add((previousRequested - previousAllocated) / previousRequested);
if (previousIsInMigration) {
vmUnderAllocatedDueToMigration += (previousRequested - previousAllocated) * timeDiff;
}
}
}
previousAllocated = entry.getAllocatedMips();
previousRequested = entry.getRequestedMips();
previousTime = entry.getTime();
previousIsInMigration = entry.isInMigration();
}
totalAllocated += vmTotalAllocated;
totalRequested += vmTotalRequested;
totalUnderAllocatedDueToMigration += vmUnderAllocatedDueToMigration;
}
metrics.put("overall", (totalRequested - totalAllocated) / totalRequested);
if (slaViolation.isEmpty()) {
metrics.put("average", 0.);
} else {
metrics.put("average", MathUtil.mean(slaViolation));
}
metrics.put("underallocated_migration", totalUnderAllocatedDueToMigration / totalRequested);
// metrics.put("sla_time_per_vm_with_migration", slaViolationTimePerVmWithMigration /
// totalTime);
// metrics.put("sla_time_per_vm_without_migration", slaViolationTimePerVmWithoutMigration /
// totalTime);
return metrics;
}
