org.cloudbus.cloudsim.schedulers.package-info Maven / Gradle / Ivy

Show more of this group Show more artifacts with this name
Show all versions of cloudsim-plus Show documentation

CloudSim Plus: A modern, highly extensible and easier-to-use Java 8 Framework for Modeling and Simulation of Cloud Computing Infrastructures and Services

There is a newer version: 8.0.0

Show newest version

/**
 * Provides processor schedulers implementations to enable multiple
 * processes to run on some CPU cores ({@link org.cloudbus.cloudsim.resources.Pe}).
 * Consider a process being a {@link org.cloudbus.cloudsim.vms.Vm} running inside a
 * {@link org.cloudbus.cloudsim.hosts.Host} (PM) or a
 * {@link org.cloudbus.cloudsim.cloudlets.Cloudlet} running inside a VM.
 *
 * A scheduler is used manage the execution of VMs inside a PM
 * and Cloudlets inside a VM. Since a PM can host multiple VMs and a VM can host multiple Cloudlets,
 * such schedulers defined the policy used to allow sharing CPU time among such processes.
 * 
 *
 * For Cloudlet and VM schedulers there are different implementations such
 * as time- and space-shared schedulers.
 * A time-shared is a multitasking scheduler that share CPU time among processes
 * if there are more processes than CPU cores.

 * A space-shared is a non-multitasking scheduler that DOES NOT share CPU time
 * among processes. Thus, if there are more processes than CPU cores, some processes
 * will have to wait until other ones finish to start executing.
 *
 * The choice of a given scheduler usually depends on desired goals
 * and different implementations may provide more or less accuracy
 * in how the processes are scheduled, what usually impacts the simulation overhead.
 *
 * @author Manoel Campos da Silva Filho
 */
package org.cloudbus.cloudsim.schedulers;