CloudSim | Cloud scheduling simulator
kandi X-RAY | CloudSim Summary
kandi X-RAY | CloudSim Summary
CloudSim is a simulator for a Cloud infrastructure (surprise!) developed on top of the SimPy framework. It's main purpose for now, is to simulate a Scheduler for a cloud, but this can easily be extended to more complicated functionalities. $: python(.exe) CloudSim.py --input --conf. Two example input files are provided: a simulation input file named "input", and a default configuration file "scheduler.conf". In order to visualize the CloudSim generated graph files (.ps format), you should have GhostScript installed, and a proper visualization tool (such as evince or GSView). In general, UNIX system have these tools installed by default. In Windows or other systems, please download and install the latest version of these tools on:
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Top functions reviewed by kandi - BETA
- Run the scheduler
- Generate a list of tasks
- Get a list of jobs from the bucket
- Check if an element can be enqueued
- Return the number of queues available
- Return the size of the queue in seconds
CloudSim Key Features
CloudSim Examples and Code Snippets
Community Discussions
Trending Discussions on CloudSim
QUESTION
Where can i find the VM allocation and selection policies for migration ? and also, in github i found many versions of CloudSim, but the problem is that the version 3 still the most clear and clean one, i don't know why in some releases they don't include the docs like in version 3.0.3, also in cloudsim 4, i found two packages, one that includes only the class files, and the other with the source files, i mean why don't they just put everything in one single asset, and in the main repository they did't include the docs folder, even though it's really important, also they did't include the jar folder that has the jar files which contains source and classes with examples.
...ANSWER
Answered 2020-Apr-07 at 23:32If you try CloudSim Plus, there is a package containing some migration examples here.
in github i found many versions of CloudSim, but the problem is that the version 3 still the most clear and clean one
CloudSim Plus is based on CloudSim 3.0.3 and is way clearer, more organized, documented and structured, making it really easier to understand and extend.
i don't know why in some releases they don't include the docs like in version 3.0.3, also in cloudsim 4, i found two packages, one that includes only the class files, and the other with the source files, i mean why don't they just put everything in one single asset, and in the main repository they did't include the docs folder, even though it's really important, also they did't include the jar folder that has the jar files which contains source and classes with examples.
If you download the source code for CloudSim or CloudSim Plus, you get everything you need. After opening the project in some IDE and building it, the javadocs and jar files will be generated inside the target dir.
In the case of CloudSim Plus, since it's available on Maven Central, you don't even need to download the sources to build the javadocs and jars, you just need to include it as a dependency inside your own project that Maven will download everything for you.
But if you want to check the documentation online, CloudSim Plus provides this link.
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.
QUESTION
Can we add a powerModel for virtual machine also as we do it for host in Cloudsim (simulation Tool)? So that we can track the power consumption of each virtual machines.
...ANSWER
Answered 2019-Aug-19 at 14:01Using CloudSim Plus you can compute the CPU usage and power consumption of a VM using the following code into your example:
QUESTION
I'm working on Cloudsim Plus(simulation Tool) for a project work and I need to calculate the power consumption of each Virtual machine for implementing VM SELECTION ALGORITHM using MAXIMUM POWER REDUCTION POLICY.
The below code is a small portion of large code, written by me in PowerExample.java which is already available in clousimPlus examples folder. I have created four Virtual machines, two host and eight cloudlets.
...ANSWER
Answered 2019-Jul-10 at 11:01Based on the PowerExample you mentioned, you can add the following method in your simulation to print VM utilization history (make sure you update your CloudSim Plus to the latest version):
QUESTION
i m working on cloudsim to implement an genetic algorithm to find the optimal placement of vms in hosts. in the begening i need to put vms randomly ( i created a class that extends from VmAllocationPolicy ) then i need to optimize vm allocation by migrating them to other hosts : i rode that i have to implement optimizeAllocation method inside my policy , i did it but i don't know how to execute it (optimizeAllocation)
...ANSWER
Answered 2019-Jan-18 at 06:53I found the solution . I called it from data center by :
datacenter0.getallocationpolicy().optimizeallocation()
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
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Install CloudSim
You can use CloudSim like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.
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