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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 introduces the SimulationCoroutineDispatcher implementation which replaces the TestCoroutineDispatcher for running single-threaded simulations.
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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 adds a quick workaround for getting kotlinx-benchmark to
work again with Gradle 7.
See https://github.com/Kotlin/kotlinx-benchmark/issues/39.
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This change fixes and issue where a SimWorkload was being re-used across
simulation runs. Given that SimWorkload is stateless, this may cause
strange issues.
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This change modifies the web runner to construct the topology only once
per repeat, given that the construction does not depend on the repeat
number.
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This change fixes an issue where incorrect scheduling weights were
applied to the filter scheduler.
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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 simplifies the conversion from power to energy consumption
used in the web runner. Now, we convert straight from J to Wh.
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This changes fixes a bug where the simulator obtained the incorrect
failure frequency causing failures to be enabled even when the user
disabled it.
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This pull request updates the Kotlin project to build with Gradle 7.0.
This is necessary to support building the project with Java 16.
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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 pull request implements the filter scheduler modeled after the scheduler
from [OpenStack](https://docs.openstack.org/nova/latest/user/filter-scheduler.html).
The scheduler is functionally equivalent to the old allocation policies, but is more
flexible and allows policies to be combined.
* A new interface, `ComputeScheduler` is introduced, which is used by the
`ComputeServiceImpl` to pick hosts to schedule on.
* `FilterScheduler` is implemented, which works by filtering and weighing the available hosts.
**Breaking API Changes**
* Removal of the `AllocationPolicy` interface and its implementations.
Users should migrate to the filter scheduler which offers the same functionality and more.
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This change adds metrics that are tracked per function instance, which
includes the runtime of the invocations, the number of invocations
(total, warm, cold, failed).
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This change adds an experiments testing the OpenDC Serverless module.
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This change adds the trace reader for the serverless experiments as
described in #48.
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This change exposes several metrics from the Serverless service, which
are needed for the experiments.
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This change migrates the OpenDC codebase to use the new FilterScheduler
for scheduling virtual machines. This removes the old allocation
policies as well.
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This change adds an implementation of the filter scheduler to the OpenDC
Compute module. This is modeled after the filter scheduler
implementation in OpenStack and should allow for more flexible
scheduling policies.
See: https://docs.openstack.org/nova/latest/user/filter-scheduler.html
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This change adds an experiment for the OpenDC Energy project, which
tests various energy models that have been implemented in OpenDC.
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This change fixes an issue in the metric exporter for summary metrics,
where instead of some average value, the sum value was reported.
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This change updates the SimHost implementation to use BatchRecorder to
batch record multiple metrics at once.
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This change fixes an issue in SimTraceWorkload where the CPU usage was
not divided across the cores, but was instead requested for all cores.
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This change fixes an issue in the RandomAllocationPolicy where it would
incorrectly obtain the required memory for the server.
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This change simplifies the way metrics are reported to the monitor.
Previously, power draw was collected separately from the other metrics.
However, with the migration to OpenTelemetry, we collect all metrics
every 5 minutes, which drastically simplifies the metric gathering
logic.
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This change updates the logic in SimAbstractMachine to only propagate
usages when the value has changed.
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This change changes the TimerScheduler implementation to prevent calling
Intrinsics.areEqual in the hot path. Profiling shows that especially
this call has a high overhead.
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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 TimerScheduler implementation to cache several
variables in the hot paths of the implementation.
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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 pull request resolves issue #91 by adopting the industry-standard OpenTelemetry standard
for collecting traces and metrics in OpenDC simulations:
* Metrics will now be exposed through OpenTelemetry's metrics API
* `opendc-telemetry` provides complementary code to support
gathering telemetry in OpenDC.
**Breaking API Changes**
* `opendc-tracer` has been removed.
* `EventFlow` and all usages of it have been removed.
* `opendc-experiments-sc18` has been removed for now, but a
suitable replacement will follow soon.
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This change updates the compute service simulator to use OpenTelemetry
for reporting metrics of the (simulated) hosts as opposed to using
custom event flows.
This approach is more generic, flexible and possibly offers better
performance as we can collect metrics of all services in a single sweep,
as opposed to listening to several services and each invoking the
handlers.
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This change updates the resource model implementation to cache the
remaining work field, which was being computed multiple times during the
same cycle.
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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 removes the event tracer from the repository as we migrate
to the industry standard OpenTelemetry.
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This change removes the event tracer from the OpenDC Workflow service as
we start migrating to the industry standard OpenTelemetry.
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This change integrates the OpenTelemetry Metrics API in the OpenDC
Workflow Service implementation. This replaces the old infrastructure for
gathering metrics.
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This change integrates the OpenTelemetry Metrics API in the OpenDC
Compute Service implementation. This replaces the old infrastructure for
gathering metrics.
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This change removes the dependency on the event tracer in
`opendc-trace`, since we are in the process of migrating OpenDC to
use OpenTelemetry for distributed tracing and metrics.
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This change changes the compute service and users of the compute service
to not rely on the internals of `ComputeServiceImpl` and instead use its
public API.
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This change adds a test suite for the OpenDC compute service.
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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 adds support for transforming the resource commands emitted
by the resource consumers. The SimResourceForwarder is modified to also
support transforming the resource commands.
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This change adds benchmarks to the opendc-simulator-compute module in
order to quantify effect of changes on the performance of this module.
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