This patch extensively modifies DSENT so that it can be accessed using Python. To access the Python interface, DSENT needs to compiled as a shared library. For this purpose a CMakeLists.txt file has been added. Some of the code that is not required is being removed.
237 lines
10 KiB
C++
237 lines
10 KiB
C++
/* Copyright (c) 2012 Massachusetts Institute of Technology
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "model/optical_graph/OpticalGraph.h"
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#include "model/OpticalModel.h"
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#include "model/optical_graph/OpticalNode.h"
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#include "model/optical_graph/OpticalLaser.h"
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#include "model/optical_graph/OpticalModulator.h"
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#include "model/optical_graph/OpticalFilter.h"
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#include "model/optical_graph/OpticalDetector.h"
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#include "model/optical_graph/OpticalWavelength.h"
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namespace DSENT
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{
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// Initialize the next visited number to be one above the initial number
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// used by OpticalNode
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int OpticalGraph::msTreeNum = OpticalNode::OPTICAL_NODE_INIT_VISITED_NUM + 1;
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OpticalGraph::OpticalGraph(const String& instance_name_, OpticalModel* model_)
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: m_instance_name_(instance_name_), m_model_(model_)
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{
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}
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OpticalGraph::~OpticalGraph()
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{
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}
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const String& OpticalGraph::getInstanceName() const
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{
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return m_instance_name_;
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}
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//-------------------------------------------------------------------------
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// Perform Datapath power optimization
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//-------------------------------------------------------------------------
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bool OpticalGraph::performPowerOpt(OpticalNode* node_, const WavelengthGroup& wavelengths_, unsigned int number_detectors_, double util_)
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{
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// Total number of iterations
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unsigned int number_iterations = 1250;
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// Maximum IL + ER
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double IL_ER_max = 10;
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// Figure out the step size used in the sweep
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double step = (double) (IL_ER_max / sqrt(2 * number_iterations));
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// Assume it is possible
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bool possible = true;
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// Begin optical data path power optimization
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Log::printLine(getInstanceName() + " -> Beginning optical data path power optimization");
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// Trace the specified wavelengths
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OpticalWavelength* wavelength = traceWavelength(wavelengths_, node_);
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// For each data path found in the wavelength
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const vector<OpticalDataPath>* data_paths = wavelength->getDataPaths();
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for (unsigned int i = 0; i < data_paths->size(); ++i)
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{
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const OpticalDataPath& data_path = data_paths->at(i);
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// Default to worst possible modulator
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double best_power = 1e99;
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double best_IL = IL_ER_max - step;
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double best_ER = step;
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// Perform power optimization for this data path
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Log::printLine(getInstanceName() + " -> Optimize data path - Laser = " + data_path.laser->getInstanceName()
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+ ", Modulator = " + data_path.modulator->getInstanceName());
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if (data_path.modulator->canOptimizeLoss())
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{
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// Iterate over IL and ER to find optimal set of IL and ER
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for (double IL = step; IL < IL_ER_max; IL += step)
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{
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for (double ER = step; ER <= (IL_ER_max - IL); ER += step)
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{
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// Ask the modulator to try this new ER and IL
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bool success = data_path.modulator->setModulatorSpec(IL, ER);
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// If the modulator was successful
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if (success)
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{
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double laser_power = wavelength->getLaserPower(number_detectors_);
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double modulator_power = data_path.modulator->getPower(util_);
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double total_power = laser_power + modulator_power;
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// If this is the new lowest power point
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if (total_power < best_power)
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{
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best_power = total_power;
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best_IL = IL;
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best_ER = ER;
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}
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}
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}
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}
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// Set IL and ER to the best ones we found
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bool success = data_path.modulator->setModulatorSpec(best_IL, best_ER);
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// If the best one we found was still not possible...
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possible = possible && success;
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// Print best IL and ER
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Log::printLine(getInstanceName() + " -> Best IL=" + (String) best_IL + ", Best ER=" + (String) best_ER +
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", Best Laser/Mod Power=" + (String) best_power);
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}
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else
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{
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// Perform power optimization for this data path
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Log::printLine(getInstanceName() + " -> Data path not set to allow optimization");
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}
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}
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// End optical data path power optimization
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Log::printLine(getInstanceName() + " -> End optical data path power optimization");
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delete wavelength;
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return possible;
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}
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//-------------------------------------------------------------------------
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// Trace wavelength(s), returning a wavelength data structure
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//-------------------------------------------------------------------------
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OpticalWavelength* OpticalGraph::traceWavelength(const WavelengthGroup& wavelengths_, OpticalNode* node_)
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{
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setTreeNum(getTreeNum() + 1);
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OpticalWavelength* wavelength = new OpticalWavelength("TraceWavelength", wavelengths_);
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return traceWavelength(wavelength, node_, NULL, NULL, 0.0);
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}
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OpticalWavelength* OpticalGraph::traceWavelength(OpticalWavelength* wavelength_, OpticalNode* node_, OpticalLaser* laser_, OpticalModulator* modulator_, double loss_)
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{
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// If the node has already been visited, don't do anything!
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if (node_->getVisitedNum() != getTreeNum())
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{
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// Set the new parity for this node
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node_->setVisitedNum(getTreeNum());
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// Calculate the loss of the current path
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double current_loss = loss_ + node_->getLoss();
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// Check if the current node is a laser, modulator or detector
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if(node_->getType() == OpticalNode::LASER)
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{
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// Set the laser lighting up the wavelength
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ASSERT(laser_ == NULL, "[Error] " + getInstanceName() + " -> Multiple " +
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"Lasers lighting up the wavelength!");
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laser_ = (OpticalLaser*) node_;
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}
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else if (node_->getType() == OpticalNode::MODULATOR)
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{
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// Check that the path already lit up by a laser and there are no
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// modulators already driving data
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ASSERT(laser_ != NULL, "[Error] " + getInstanceName() + " -> Wavelength reaches a " +
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"modulator (" + node_->getInstanceName() + ") prior to being lit up by a laser!");
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ASSERT(modulator_ == NULL, "[Error] " + getInstanceName() + " -> Two modulators are driving" +
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" the same optical data path (" + node_->getInstanceName() + ")!");
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modulator_ = (OpticalModulator*) node_;
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}
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else if (node_->getType() == OpticalNode::DETECTOR)
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{
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// Check that the path is both lit up by a laser and there is
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// a modulator driving data
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ASSERT(laser_ != NULL, "[Error] " + getInstanceName() + " -> Wavelength reaches a " +
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"detector (" + node_->getInstanceName() + ") prior to being lit up by a laser!");
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ASSERT(modulator_ != NULL, "[Error] " + getInstanceName() + " -> Wavelength reaches a " +
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"detector (" + node_->getInstanceName() + ") prior to being driven by a modulator!");
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// Add a detector to the wavelength
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wavelength_->addDataPath(laser_, modulator_, (OpticalDetector*) node_, current_loss);
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}
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// Traverse downstream nodes to calculate the delay through each downstream path
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vector<OpticalNode*>* d_nodes = node_->getDownstreamNodes();
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bool trace_downstream = (node_->getType() != OpticalNode::DETECTOR);
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// Do special things when traversing filters
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if (node_->getType() == OpticalNode::FILTER)
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{
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OpticalFilter* filter_node = (OpticalFilter*) node_;
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if (filter_node->isDropped(wavelength_->getWavelengths()))
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traceWavelength(wavelength_, filter_node->getDropPort(), laser_, modulator_, loss_ + filter_node->getDropLoss());
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// If the filter is not modeled as a complete drop, continue tracing downstream
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trace_downstream = !filter_node->getDropAll();
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}
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if (trace_downstream)
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{
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// Trace downstream nodes
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for (unsigned int i = 0; i < d_nodes->size(); ++i)
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traceWavelength(wavelength_, d_nodes->at(i), laser_, modulator_, current_loss);
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}
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}
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return wavelength_;
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}
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//-------------------------------------------------------------------------
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OpticalGraph::OpticalGraph(const OpticalGraph& /* graph_ */)
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{
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// Disabled
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}
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OpticalModel* OpticalGraph::getModel()
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{
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return m_model_;
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}
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void OpticalGraph::setTreeNum(int tree_num_)
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{
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msTreeNum = tree_num_;
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return;
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}
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int OpticalGraph::getTreeNum()
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{
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return msTreeNum;
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}
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} // namespace DSENT
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