What are the Default VM Schedulers Available in CloudSim?
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Condition for Default VM Schedulers Available in CloudSim
Description: In CloudSim, VM Schedulers are responsible for managing how processing elements (PEs) on a host are allocated to VMs.
VmSchedulerTimeShared: Description: This scheduler allows VMs to share the PEs simultaneously using a time-shared policy. Each VM gets a time slice of the PE, meaning that multiple VMs can use the same PE at the same time, but only a fraction of the MIPS is allocated to each. Use Case: Suitable for scenarios where VMs need to share resources dynamically and the workload can tolerate time-sliced execution.
VmSchedulerSpaceShared: Description: This scheduler allocates PEs in a space-shared manner. Each PE is assigned to only one VM at a time. If there are more VMs than available PEs, the extra VMs must wait until a PE is freed. Use Case: Ideal for workloads that require dedicated PEs without resource contention.
VmSchedulerCompletelyFair: Description: This scheduler ensures a fair allocation of PEs among VMs based on their requested MIPS. It distributes available MIPS among all VMs in a balanced way. Use Case: Useful when fairness in resource allocation among VMs is a priority.
VmSchedulerTimeSharedOverSubscription: Description: Extends the VmSchedulerTimeShared by allowing over-subscription. This means it can allocate more MIPS to VMs than the total available capacity, useful for scenarios where not all VMs use their full requested MIPS simultaneously. Use Case: Suitable for over-committing resources in environments where some VMs are under-utilized.