merge: Implement multi-flow stages in simulator (#110)

This pull request introduces the new `flow2` multi-flow simulator into the OpenDC codebase
and adjust all existing modules to make use of this new simulator.

The new simulator models flow as a network of components, which can each receive flow
from (potentially) multiple other components. In the previous simulator, the framework itself
supported only single flows between components and required re-implementation of many
components to support multiplexing flows.

Initial benchmarks show performance improvements in the range 2x–4x for large scale experiments
such as the Capelin benchmarks.

## Implementation Notes :hammer_and_pick:

* Add support for multi-flow stages
* Support flow transformations
* Add forwarding flow multiplexer
* Expose metrics on FlowMultiplexer
* Re-implement network sim using flow2
* Re-implement power sim using flow2 
* Re-implement compute sim using flow2
* Optimize workload implementation of SimTrace 
* Remove old flow simulator 
* Add log4j-core dependency 

## External Dependencies :four_leaf_clover:

* N/A

## Breaking API Changes :warning:

* Removal of the `org.opendc.simulator.flow` package. You should now use
   the new flow simulator located in `org.opendc.simulator.flow2`.
* `PowerModel` interface is replaced by the `CpuPowerModel` interface.
* `PowerDriver` interface is replaced by the `SimPsu` and `SimPsuFactory` interfaces.
* Removal of `SimTraceWorkload`. Instead, create a workload from a `SimTrace` using 
  `createWorkload(offset)`.
* `ScalingGovernor` has been split in a `ScalingGovernor` and `ScalingGovernorFactory`.
* All modules in `opendc-simulator` are now written in Java. This means that default 
   parameters are not supported anymore for these modules.

1 files changed, 0 insertions, 29 deletions

diff --git a/opendc-simulator/opendc-simulator-compute/src/test/resources/spec_machines.yml b/opendc-simulator/opendc-simulator-compute/src/test/resources/spec_machines.yml
deleted file mode 100644
index d51cba80..00000000
--- a/opendc-simulator/opendc-simulator-compute/src/test/resources/spec_machines.yml
+++ /dev/null
@@ -1,29 +0,0 @@
----
-# The power model of an IBM server x3550 (2 x [Xeon X5675 3067 MHz, 6 cores], 16GB).<br/>
-# <a href="http://www.spec.org/power_ssj2008/results/res2011q2/power_ssj2008-20110406-00368.html">
-# http://www.spec.org/power_ssj2008/results/res2011q2/power_ssj2008-20110406-00368.html</a>
-IBMx3550M3_XeonX5675: [58.4, 98.0, 109.0, 118.0, 128.0, 140.0, 153.0, 170.0, 189.0, 205.0, 222.0]
- # The power model of an IBM server x3550 (2 x [Xeon X5670 2933 MHz, 6 cores], 12GB).<br/>
- # <a href="http://www.spec.org/power_ssj2008/results/res2010q2/power_ssj2008-20100315-00239.html">
- # http://www.spec.org/power_ssj2008/results/res2010q2/power_ssj2008-20100315-00239.html</a>
-IBMx3550M3_XeonX5670: [66.0, 107.0, 120.0, 131.0, 143.0, 156.0, 173.0, 191.0, 211.0, 229.0, 247.0]
- # the power model of an IBM server x3250 (1 x [Xeon X3480 3067 MHz, 4 cores], 8GB).<br/>
- # <a href="http://www.spec.org/power_ssj2008/results/res2010q4/power_ssj2008-20101001-00297.html">
- # http://www.spec.org/power_ssj2008/results/res2010q4/power_ssj2008-20101001-00297.html</a>
-IBMx3250M3_XeonX3480: [42.3, 46.7, 49.7, 55.4, 61.8, 69.3, 76.1, 87.0, 96.1, 106.0, 113.0]
- # The power model of an IBM server x3250 (1 x [Xeon X3470 2933 MHz, 4 cores], 8GB).<br/>
- # <a href="http://www.spec.org/power_ssj2008/results/res2009q4/power_ssj2008-20091104-00213.html">
- # http://www.spec.org/power_ssj2008/results/res2009q4/power_ssj2008-20091104-00213.html</a>
-IBMx3250M3_XeonX3470: [41.6, 46.7, 52.3, 57.9, 65.4, 73.0, 80.7, 89.5, 99.6, 105.0, 113.0]
- # The power model of an HP ProLiant ML110 G5 (1 x [Xeon 3075 2660 MHz, 2 cores], 4GB).<br/>
- # <a href="http://www.spec.org/power_ssj2008/results/res2011q1/power_ssj2008-20110124-00339.html">
- # http://www.spec.org/power_ssj2008/results/res2011q1/power_ssj2008-20110124-00339.html</a>
-HPProLiantMl110G5_Xeon3075: [93.7, 97.0, 101.0, 105.0, 110.0, 116.0, 121.0, 125.0, 129.0, 133.0, 135.0]
- # The power model of an HP ProLiant ML110 G4 (1 x [Xeon 3040 1860 MHz, 2 cores], 4GB).<br/>
- # <a href="http://www.spec.org/power_ssj2008/results/res2011q1/power_ssj2008-20110127-00342.html">
- # http://www.spec.org/power_ssj2008/results/res2011q1/power_ssj2008-20110127-00342.html</a>
-HPProLiantMl110G4_Xeon3040: [86.0, 89.4, 92.6, 96.0, 99.5, 102.0, 106.0, 108.0, 112.0, 114.0, 117.0]
- # The power model of an HP ProLiant ML110 G3 (1 x [Pentium D930 3000 MHz, 2 cores], 4GB).<br/>
- # <a href="http://www.spec.org/power_ssj2008/results/res2011q1/power_ssj2008-20110127-00342.html">
- # http://www.spec.org/power_ssj2008/results/res2011q1/power_ssj2008-20110127-00342.html</a>
-HPProLiantMl110G3_PentiumD930: [105.0, 112.0, 118.0, 125.0, 131.0, 137.0, 147.0, 153.0, 157.0, 164.0, 169.0]