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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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This change eliminates the overhead caused by ArrayList iteration in the
MaxMinFlowMultiplexer class.
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This change simplifies the FlowSink implementation by not relying on the
AbstractFlowConsumer, but instead implementing the FlowConsumer
interface itself.
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This change updates the SimAbstractHypervisor and MaxMinFlowMultiplexer
to count interference of multiplexer inputs, instead of only counting
them for the scheduler as a whole.
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This change updates the MaxMinFlowMultiplexer implementation to skip the
fair-share algorithm in case the total demand is lower than the
available capacity. In this case, no re-division of capacity is
necessary.
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This change improves the performance of the SimTraceWorkload class by
changing the way trace fragments are read and processed by the CPU
consumers.
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This change removes the sorting step for the outputs in the scheduling
procedure for the max min multiplexer. This step is only necessary when
the capacity of one of the outputs changes, which does not happen often.
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This change updates the MaxMinFlowMultiplexer implementation to
centrally manage the deadlines of the `FlowSource`s as opposed to each
source using its own timers. For large amounts of inputs, this is much
faster as the multiplexer already needs to traverse each input on a
timer expiration of an input.
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This change adds a new interface to the SimHypervisor interface that
exposes the CPU time counters directly. These are derived from the flow
counters and will be used by SimHost to expose them via telemetry.
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This change optimizes the hot path of the SimTraceWorkload class. This
class is used by multiple experiments to replay workload traces and
consumes a considerable amount of time of the total time of the
experiments.
By inlining the isExpired method, marking the properties on the Fragment
class as field, and caching several properties locally in the class, we
reduce the amount of virtual method calls in the hot path.
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This change updates the implementation of FlowConsumerContextImpl to
reduce the number of field accesses by storing the flags of the
connection inside a single integer.
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This change adds two new properties for controlling whether the
convergence callbacks of the source and consumer respectively should be
invoked. This saves a lot of unnecessary calls for stages that do not
have any implementation of the `onConvergence` method.
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This change fixes the loss computation for both the UPS and PDU
implementation that was broken due to the new pushing mechanism. We
implement a new class FlowMapper that can be used to map the flow pushed
by a `FlowSource` using a user-specified method.
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This change creates separate callbacks for the remaining events:
onStart, onStop and onConverge.
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This change removes the Capacity entry from FlowEvent. Since the source
is always pulled on a capacity change, we do not need a separate event
for this.
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This change removes the `onFailure` method from FlowSource. Instead, the
FlowConsumer will receive the reason for failure of the source.
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