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// Copyright Verizon Media. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.hosted.provision.autoscale;
/**
* A resource target to hit for the allocation optimizer.
* The target is measured in cpu, memory and disk per node in the allocation given by current.
*
* @author bratseth
*/
public class ResourceTarget {
private final boolean adjustForRedundancy;
/** The target resources per node, assuming the node assignment in current */
private final double cpu, memory, disk;
private ResourceTarget(double cpu, double memory, double disk, boolean adjustForRedundancy) {
this.cpu = cpu;
this.memory = memory;
this.disk = disk;
this.adjustForRedundancy = adjustForRedundancy;
}
/** Are the target resources given by this including redundancy or not */
public boolean adjustForRedundancy() { return adjustForRedundancy; }
/** Returns the target cpu per node, in terms of the current allocation */
public double nodeCpu() { return cpu; }
/** Returns the target memory per node, in terms of the current allocation */
public double nodeMemory() { return memory; }
/** Returns the target disk per node, in terms of the current allocation */
public double nodeDisk() { return disk; }
private static double nodeUsage(Resource resource, double load, AllocatableClusterResources current) {
return load * resource.valueFrom(current.realResources());
}
/** Create a target of achieving ideal load given a current load */
public static ResourceTarget idealLoad(double currentCpuLoad, double currentMemoryLoad, double currentDiskLoad,
AllocatableClusterResources current) {
return new ResourceTarget(nodeUsage(Resource.cpu, currentCpuLoad, current) / Resource.cpu.idealAverageLoad(),
nodeUsage(Resource.memory, currentMemoryLoad, current) / Resource.memory.idealAverageLoad(),
nodeUsage(Resource.disk, currentDiskLoad, current) / Resource.disk.idealAverageLoad(),
true);
}
/** Crete a target of preserving a current allocation */
public static ResourceTarget preserve(AllocatableClusterResources current) {
return new ResourceTarget(current.realResources().vcpu(),
current.realResources().memoryGb(),
current.realResources().diskGb(),
false);
}
}
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