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This change updates the project structure to become flattened.
Previously, the simulator, frontend and API each lived into their own
directory.
With this change, all modules of the project live in the top-level
directory of the repository. This should improve discoverability of
modules of the project.
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This change adds a power model for optimizing the mean squared error
to the available power models in OpenDC.
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This change migrates the remainder of the codebase to the
SimulationCoroutineDispatcher implementation.
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This change introduces the SimulationCoroutineDispatcher implementation
which replaces the TestCoroutineDispatcher for running single-threaded
simulations.
Previously, we used the TestCoroutineDispatcher from the
kotlinx-coroutines-test modules for running simulations. However, this
module is aimed at coroutine tests and not at simulations.
In particular, having to construct a Clock object each time for the
TestCoroutineDispatcher caused a lot of unnecessary lines. With the new
approach, the SimulationCoroutineDispatcher automatically exposes a
usable Clock object.
In addition to ergonomic benefits, the SimulationCoroutineDispatcher is
much faster than the TestCoroutineDispatcher due to the assumption that
simulations run in only a single thread. As a result, the dispatcher
does not need to perform synchronization and can use the fast
PriorityQueue implementation.
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This change introduces the SimProcessingUnit which represents a
simulated processing unit which the user can control during the workload
execution.
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This change adds the asymptotic power model that is used in GreenCloud
to the available power models in OpenDC.
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This change removes the StateFlow speed property on the
SimResourceSource, as the overhead of emitting changes to the StateFlow
is too high in a single-thread context. Our new approach is to use
direct callbacks and counters.
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This change updates the power models by fixing some of the documentation
and adding toString() methods.
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This change adds a model implementing Dynamic Voltage Frequency Scaling
(DVFS) to OpenDC.
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This change enables the use of the interpolation model testing on the results of the SPEC benchmark.
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This change moves the power models from the `opendc-compute-simulator`
to the `opendc-simulator-compute` module, since it better fits the scope
of the models and allows them to be re-used for other purposes.
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This change re-enables support for VM usage metrics by adding an adapter
for SimResourceConsumer instances that can export the consumer speed.
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This change removes the generic resource constraint (e.g., SimResource)
and replaces it by a simple capacity property. In the future, users
should handle the resource properties on a higher level.
This change simplifies compositions of consumers and providers by not
requiring a translation from resource to capacity.
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This change moves the hypervisor implementations to the
opendc-simulator-resources module and makes them generic to the resource
type that is being used (e.g., CPU, disk or networking).
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This change adds a generic framework for modeling resource consumptions and
adapts opendc-simulator-compute to model machines and VMs on top of
this framework.
This framework anticipates the addition of additional resource types
such as memory, disk and network to the OpenDC codebase.
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This change allows users to select the hypervisor scheduler to use when
deploying hypervisors onto bare-metal machines.
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This change adds a new hypervisor implementation that supports virtual
machine that have exclusive access to resources (e.g., CPU).
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This change converts the low-level workload model to be pull-based. This
reduces the overhead that we experienced with our previous co-routine
based approach.
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This change updates the workflow service to delegate the resource
scheduling logic to the virtualized resource provisioner.
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This change reimplements the performance interference model originally
implemented for the SimpleVirtDriver class, for SimHypervisor.
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This change adds an implementation of the VirtDriver interface that uses
the functionality provided by the opendc-simulator-compute module.
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This change adds an opendc-simulator-compute module which contains
interfaces related to simulating compute workloads. For future changes,
we intend to decouple the simulation part from the opendc-compute
module.
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