cloudsim | CloudSim : A Framework For Modeling And Simulation Of Cloud
kandi X-RAY | cloudsim Summary
kandi X-RAY | cloudsim Summary
Cloud computing is the leading approach for delivering reliable, secure, fault-tolerant, sustainable, and scalable computational services. Hence timely, repeatable, and controllable methodologies for performance evaluation of new cloud applications and policies before their actual development are reqruied. Because utilization of real testbeds limits the experiments to the scale of the testbed and makes the reproduction of results an extremely difficult undertaking, simulation may be used. CloudSim goal is to provide a generalized and extensible simulation framework that enables modeling, simulation, and experimentation of emerging Cloud computing infrastructures and application services, allowing its users to focus on specific system design issues that they want to investigate, without getting concerned about the low level details related to Cloud-based infrastructures and services. CloudSim is developed in the Cloud Computing and Distributed Systems (CLOUDS) Laboratory, at the Computer Science and Software Engineering Department of the University of Melbourne. More information can be found on the CloudSim's web site.
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Top functions reviewed by kandi - BETA
- Prints the results of the simulation
- Get SLA metrics
- Write the time allocation history
- Get the SLA time per host
- Process an event notification
- Process a Cloudlet move
- Process a Cloudlet event
- Process a Cloudlet submit event
- Example of running a CloudSim example
- Process the Cloudlet submit event
- Starts the example
- Resume the specified volume
- Find the VM that can be allocated to
- Gets the migration map
- Initialize output
- Example of running this example
- Create a new NetworkCloudlet
- Main entry point for example
- Process an event
- Update the state of the CloudSimulators
- Example of the example
- Update the VMM processing
- Main entry point
- Main entry point for the example
- Update the Cloudlet processing
- Main method for example
cloudsim Key Features
cloudsim Examples and Code Snippets
Community Discussions
Trending Discussions on cloudsim
QUESTION
I'd like to delay the arrival of the Cloudlet so that they arrive later. I know about setSubmissionDelay() but I wanted a submission delay that is not relative to the current simulation time like setSubmissionDelay() is. For example, if a cloudlet has a delay of 5 seconds it will be created exactly at that time and not at something like 5.10 seconds (.10 seconds being from the minimum time between events). I've thought about using a listener to listen and intercept when a cloudlet is about to be submitted to a VM to grab time at that moment (it would likely by .10 or some small-time value), then subtract my delay time by that time (current delay of a cloudlet - current simulation time = non-relative submission delay).
The issue is I can't find a listener that does this. Looking at the console output below makes me think that maybe a listener or some kind of method is used to print, a cloudlet is being sent before it is. If something like this exists, I'd like to use it. Any access to documentation or repositories similar goals will be highly appreciated.
...ANSWER
Answered 2020-Apr-07 at 18:10Do you really need such a precision? 0.1 second is a really small value.
Anyway, you can set a Datacenter schedulingInterval to the minimum interval you want (for instance, 1 second), then use the CloudSim Plus' onClockTickListener to track the simulation time and submit your cloudlets when you want. See the code snippet below, but you have no guarantees that the event will be fired exactly at the times you want.
QUESTION
I wanted to know if there was a feature in CloudSim Plus that allows the migration of Cloudlets. This means that a Cloudlet could be executing on a VM or is waiting to be executed on a VM and can be sent to another VM (which may be in another data center) to be executed instead. In the CloudSim Plus API, I only see VM allocation policies for migration and nothing about Cloudlet migration.
...ANSWER
Answered 2020-Mar-21 at 22:23CloudSim Plus doesn't have anyway to migrate Cloudlets. In real cloud computing environments we don't migrate Cloudlets but containers instead. This container can be a Vm which can host Cloudlets that are currently executing and can be migrated to another datacenter to continue execution. In this way (with containers) it makes sense to migrate Cloudlets. Containers are needed to encapsulate the dependencies and configurations of an application. Cloudlet migration is a complex task that can't be done automatically. It is hard to determine the dependencies and configurations that must be migrated to allow an application (Cloudlet) to execute.
According to the main developer of CloudSim and CloudSim Plus:
However, CloudSim Plus doesn't support container abstration and it's not intended to support in the short or medium term. CloudSim 4 includes container support, but the way this feature was implemented (literally by copying and pasting entire packages of classes) made us to create CloudSim Plus as an independent fork.
It's also important to understand when a Cloudlet is mapped to a Vm at runtime, it can't be changed because this would allow for Cloudlet migration to a different Vm which isn't allowed by CloudSim. As an alternative you could try defining your own policy to map incoming Cloudlets to Vms at run time/dynamically (chose Vms to execute a Cloudlet).
You can do this by extending the DatacenterBrokerSimple class and by changing the defaultVmMapper() method. If your policy fails to map a Cloudlet to a Vm it will default to the defaultVmMapper in DatacenterBrokerSimple.
The setVmMapper() method in DatacenterBrokerSimple lets you define a policy to map Cloudlets to a Vm at runtime (it sets the appropriate mapper method). This method can be used to change the policy at run time.
To learn more about this refer to the 2 CloudSim Plus Google Group Forums: 1, 2.
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