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This change updates the interface of `SimWorkload` to support
snapshotting workloads. We introduce a new method `snapshot()` to this
interface which returns a new `SimWorkload` that can be started at a
later point in time and on another `SimMachine`, which continues
progress from the moment the workload was snapshotted.
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This change updates the implementation of `SimMachineContext` to report
exceptions thrown in `onStop` as suppressed exceptions if an exception
caused the workload to stop.
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This change adds a new method to `FlowStage` called `sync()` which
enables users to synchronously update the stage at the current
timestamp.
This functionality is neccessary to support snapshotting since we need
to synchronize the state of the `FlowStage` before creating a snapshot
of the workload.
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This change adds a new static method `chain` to `SimWorkloads` to chain
multiple workloads sequentially.
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This change updates the interface of `SimMachineContext` to allow
workloads to reset all resources provided by the machine to the
workload. This allows us to implement a `SimWorkload` that can compose
multiple workloads.
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This change introduces a new class SimWorkloads which provides
construction methods for the standard workloads available in OpenDC.
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This change updates the interface of `SimMachine#startWorkload` to
introduce a parameter `completion` that is invoked when the workload
completes either succesfully or due to failure.
This functionality has often been implemented by wrapping a
`SimWorkload` and catching its exceptions. However, since this
functionality is used in all usages of `SimMachine#startWorkload` we
instead embed it into `SimMachine` itself.
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This change removes the old version of the flow simulator from the
OpenDC repository. The old version has been replaced by the new flow2
framework which is able to simulate flows more efficiently.
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This change updates the workload implementation of SimTrace by
introducing multiple implementations of the FlowStageLogic interface,
which is selected dynamically when the workload starts.
This change helps eliminate the unecessary division (and memory fetch)
when running a workload with just a single CPU.
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This change re-implements the OpenDC compute simulator framework using
the new flow2 framework for modelling multi-edge flow networks. The
re-implementation is written in Java and focusses on performance and
clean API surface.
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This change updates the `opendc-simulator-power` module to use the new
flow simulation framework in OpenDC (named flow2 for now).
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This change implements a new `FlowMultiplexer` that forwards the inputs
directly to one of the pre-allocated outputs.
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This change adds a new component, FlowTransform, which is able to
transform the flow from one component to another, based on some
inversible transformation.
Such as component is useful when converting between different units of
flow between different components.
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This change adds support for creating nodes in a flow graph that support
multiple inputs and outputs directly, instead of our current approach
where we need to re-implement the `FlowConsumerContext` interface in
order to support multiple inputs or outputs.
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This change updates the build configuration to use Spotless for code
formating of both Kotlin and Java.
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This change updates the repository to remove the use of wildcard imports
everywhere. Wildcard imports are not allowed by default by Ktlint as
well as Google's Java style guide.
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This change renames the method `runBlockingSimulation` to
`runSimulation` to put more emphasis on the simulation part of the
method. The blocking part is not that important, but this behavior is
still described in the method documentation.
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This change updates the implementation of `SimulationDispatcher` to use
a (possibly user-provided) `SimulationScheduler` for managing the
execution of the simulation and future tasks.
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This change introduces a new class, `SimulationScheduler`, which
provides the basis for simulations in OpenDC by allowing components to
schedule future tasks using delay-skipping queue and a virtual clock.
This new class is written in Java to remove any dependency on the
Kotlin and kotlinx-coroutines runtime when not necessary.
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This change simplifies the SimHypervisor class into a single
implementation. Previously, it was implemented as an abstract class with
multiple implementations for each multiplexer type. We now pass the
multiplexer type as parameter to the SimHypervisor constructor.
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This change updates the virtual machine performance interference model
so that the interference domain can be constructed independently of the
interference profile. As a consequence, the construction of the topology
now does not depend anymore on the interference profile.
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This change updates the constructor of SimHost to receive a
`SimBareMetalMachine` and `SimHypervisor` directly instead of
construction these objects itself. This ensures better testability and
also simplifies the constructor of this class, especially when future
changes to `SimBareMetalMachine` or `SimHypervisor` change their
constructors.
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This change moves the Random dependency outside the interference model,
to allow the interference model to be completely immutable and passable
between different simulations.
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This change updates the performance interference algorithm to remove the
boxing that happened due to using a generic collection for storing
integers. This collection was accessed in the algorithm's hot path, so
could cause slowdown.
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This change updates the design of the VM interference model, where we
move more of the logic into the `VmInterferenceMember` interface. This
removes the dependency on the `VmInterferenceModel` for the hypervisor
interface.
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This change updates the signature of the `SimHypervisor` interface to
accept a `VmInterferenceKey` when creating a new virtual machine,
instead of providing a string identifier. This is in preparation for
removing the dependency on the `VmInterferenceModel` in the
`SimAbstractHypervisor` class.
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This change removes the timestamp parameter from `SimTrace`. Instead, it
is now assumed that the trace is continuous and the end of a fragment
starts a new fragment, in order to simplify replaying of the trace.
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This change removes the reference to the active FlowEngine from the
SimMachineContext interface. This prevents leaking the lower layer into
this module.
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This change removes the convergence listener parameter in for the
`SimBareMetalMachine` and the hypervisors. This parameter was not used
in the code-base and is being removed with the introduction of the new
flow2 module.
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This change moves the core of the VM interference model from the flow
module into the compute simulator. This logic can be contained in the
compute simulator and does not need to leak into the flow-level
simulator.
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This change fixes an issue in the `SimBareMetalMachine` implementation
where the power usage was only updated after a non-zero duration. However,
this would mean that OpenDC would possibly report incorrect power usage
values when multiple convergence calls occured at the same timestamp.
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This change fixes an issue where the `SimTrace.Builder` would quickly
allocate too much memory when constructing a trace, due to doubling the
array sizes each time. Instead, we use the approach used by `ArrayList`,
where we increase the array size by 50% every step.
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This change updates the Gradle build configuration of the project to
publish the different type of modules (e.g., opendc-compute,
opendc-simulator) into their own groups.
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This change updates the Gradle build configuration to ensure that all
library modules (that will be published) use testing and are included in
coverage reports. This should ensure the public modules remain well
tested.
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This change removes the delta parameter from the callbacks of the flow
framework. This parameter was used to indicate the duration in time
between the last call and the current call. However, its usefulness was
limited since the actual delta values needed by implementors of this
method had to be bridged across different flow callbacks.
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This change updates the FlowConsumerContextImpl by moving the logger
outside of the class. This prevents each instance of this class from
having to construct a logger instance.
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This change updates the simulator implementation to flush the active
progress when accessing the hypervisor counters. Previously, if the
counters were accessed, while the mux or consumer was in progress, its
counter values were not accurate.
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This change removes the opendc-platform module from the project. This
module represented a Java platform which was previously used for sharing
a set of dependency versions between subprojects. However, with the
version catalogue that was added by Gradle, we currently do not use the
platform anymore.
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This change addresses an issue with the SimSpaceSharedHypervisor
implementation where it did not emit convergence events due to missing
implementation. This caused issues with users of this class trying to
obtain usage data, which depended on these events being emitted.
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This change updates the implementation of the trace converter and
SimTrace implementation to support cases where there is a gap between
samples in the trace data.
This change allows users to specify what to do in case samples are
missing in the trace. The available options are specified in
`SimTrace.FillMode`. Currently, we support either carrying the previous
value forward or set the usage to zero.
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This change updates the SimMachine interface to drop the coroutine
requirement for running a workload on a machines. Users can now
asynchronously start a workload and receive notifications via the
workload callbacks.
Users still have the possibility to suspend execution during workload
execution by using the new `runWorkload` method, which is implemented on
top of the new `startWorkload` primitive.
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This change fixes an issue with the FlowMultiplexer implementation where
the capacity of each flow input was equal to the capacity of all flow
outputs. Now, the user can specify the capacity of the input, which will
be used to correctly compute the active and idle time.
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This change redesigns the virtual machine interference algorithm to have
a fixed memory usage per `VmInterferenceModel` instance. Previously, for
every interference domain, a copy of the model would be created, leading
to OutOfMemory errors when running multiple experiments at the same
time.
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This change fixes an issue with the JMH plugin where entries would be
included twice on the classpath or entries that did not belong on the
classpath were also included.
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This change addresses an issue where energy usage was not computed
correctly if the machine performed no work in between collection cycles.
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This change fixes two issues with the resizing logic of the specialized
queue implementations used by the FlowEngine implementation.
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This change eliminates the clock calls in the hot path, by passing the
current timestamp directly as method parameter.
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This change specializes the queues used by the FlowEngine implementation
in order to reduce the overhead caused by type-erasure of generics.
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