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File indexing completed on 2022-01-24 01:11:35

 #include "FWCore/Framework/interface/PathsAndConsumesOfModules.h"
 
 #include "FWCore/Framework/interface/Schedule.h"
 #include "FWCore/Framework/interface/ModuleProcessName.h"
 #include "FWCore/Framework/interface/maker/Worker.h"
 
 #include "FWCore/Utilities/interface/EDMException.h"
 
 #include <algorithm>
 #include <limits>
 #include <unordered_set>
 namespace edm {
 
   PathsAndConsumesOfModules::PathsAndConsumesOfModules() = default;
   PathsAndConsumesOfModules::~PathsAndConsumesOfModules() = default;
 
   void PathsAndConsumesOfModules::initialize(Schedule const* schedule, std::shared_ptr<ProductRegistry const> preg) {
     schedule_ = schedule;
     preg_ = preg;
 
     paths_.clear();
     schedule->triggerPaths(paths_);
 
     endPaths_.clear();
     schedule->endPaths(endPaths_);
 
     modulesOnPaths_.resize(paths_.size());
     unsigned int i = 0;
     unsigned int hint = 0;
     for (auto const& path : paths_) {
       schedule->moduleDescriptionsInPath(path, modulesOnPaths_.at(i), hint);
       if (!modulesOnPaths_.at(i).empty())
         ++hint;
       ++i;
     }
 
     modulesOnEndPaths_.resize(endPaths_.size());
     i = 0;
     hint = 0;
     for (auto const& endpath : endPaths_) {
       schedule->moduleDescriptionsInEndPath(endpath, modulesOnEndPaths_.at(i), hint);
       if (!modulesOnEndPaths_.at(i).empty())
         ++hint;
       ++i;
     }
 
     schedule->fillModuleAndConsumesInfo(allModuleDescriptions_,
                                         moduleIDToIndex_,
                                         modulesWhoseProductsAreConsumedBy_,
                                         modulesInPreviousProcessesWhoseProductsAreConsumedBy_,
                                         *preg);
   }
 
   void PathsAndConsumesOfModules::removeModules(std::vector<ModuleDescription const*> const& modules) {
     // First check that no modules on Paths are removed
     auto checkPath = [&modules](auto const& paths) {
       for (auto const& path : paths) {
         for (auto const& description : path) {
           if (std::find(modules.begin(), modules.end(), description) != modules.end()) {
             throw cms::Exception("Assert")
                 << "PathsAndConsumesOfModules::removeModules() is trying to remove a module with label "
                 << description->moduleLabel() << " id " << description->id() << " from a Path, this should not happen.";
           }
         }
       }
     };
     checkPath(modulesOnPaths_);
     checkPath(modulesOnEndPaths_);
 
     // Remove the modules and adjust the indices in idToIndex map
     for (auto iModule = 0U; iModule != allModuleDescriptions_.size(); ++iModule) {
       auto found = std::find(modules.begin(), modules.end(), allModuleDescriptions_[iModule]);
       if (found != modules.end()) {
         allModuleDescriptions_.erase(allModuleDescriptions_.begin() + iModule);
         for (auto iBranchType = 0U; iBranchType != NumBranchTypes; ++iBranchType) {
           modulesWhoseProductsAreConsumedBy_[iBranchType].erase(
               modulesWhoseProductsAreConsumedBy_[iBranchType].begin() + iModule);
         }
         modulesInPreviousProcessesWhoseProductsAreConsumedBy_.erase(
             modulesInPreviousProcessesWhoseProductsAreConsumedBy_.begin() + iModule);
         for (auto& idToIndex : moduleIDToIndex_) {
           if (idToIndex.second >= iModule) {
             idToIndex.second--;
           }
         }
         --iModule;
       }
     }
   }
 
   std::vector<ModuleProcessName> const& PathsAndConsumesOfModules::modulesInPreviousProcessesWhoseProductsAreConsumedBy(
       unsigned int moduleID) const {
     return modulesInPreviousProcessesWhoseProductsAreConsumedBy_.at(moduleIndex(moduleID));
   }
 
   ModuleDescription const* PathsAndConsumesOfModules::doModuleDescription(unsigned int moduleID) const {
     unsigned int dummy = 0;
     auto target = std::make_pair(moduleID, dummy);
     std::vector<std::pair<unsigned int, unsigned int>>::const_iterator iter =
         std::lower_bound(moduleIDToIndex_.begin(), moduleIDToIndex_.end(), target);
     if (iter == moduleIDToIndex_.end() || iter->first != moduleID) {
       throw Exception(errors::LogicError)
           << "PathsAndConsumesOfModules::moduleDescription: Unknown moduleID " << moduleID << "\n";
     }
     return allModuleDescriptions_.at(iter->second);
   }
 
   std::vector<ModuleDescription const*> const& PathsAndConsumesOfModules::doModulesOnPath(unsigned int pathIndex) const {
     return modulesOnPaths_.at(pathIndex);
   }
 
   std::vector<ModuleDescription const*> const& PathsAndConsumesOfModules::doModulesOnEndPath(
       unsigned int endPathIndex) const {
     return modulesOnEndPaths_.at(endPathIndex);
   }
 
   std::vector<ModuleDescription const*> const& PathsAndConsumesOfModules::doModulesWhoseProductsAreConsumedBy(
       unsigned int moduleID, BranchType branchType) const {
     return modulesWhoseProductsAreConsumedBy_[branchType].at(moduleIndex(moduleID));
   }
 
   std::vector<ConsumesInfo> PathsAndConsumesOfModules::doConsumesInfo(unsigned int moduleID) const {
     Worker const* worker = schedule_->allWorkers().at(moduleIndex(moduleID));
     return worker->consumesInfo();
   }
 
   unsigned int PathsAndConsumesOfModules::doLargestModuleID() const {
     // moduleIDToIndex_ is sorted, so last element has the largest ID
     return moduleIDToIndex_.empty() ? 0 : moduleIDToIndex_.back().first;
   }
 
   unsigned int PathsAndConsumesOfModules::moduleIndex(unsigned int moduleID) const {
     unsigned int dummy = 0;
     auto target = std::make_pair(moduleID, dummy);
     std::vector<std::pair<unsigned int, unsigned int>>::const_iterator iter =
         std::lower_bound(moduleIDToIndex_.begin(), moduleIDToIndex_.end(), target);
     if (iter == moduleIDToIndex_.end() || iter->first != moduleID) {
       throw Exception(errors::LogicError)
           << "PathsAndConsumesOfModules::moduleIndex: Unknown moduleID " << moduleID << "\n";
     }
     return iter->second;
   }
 }  // namespace edm
 
 namespace {
   // helper function for nonConsumedUnscheduledModules,
   void findAllConsumedModules(edm::PathsAndConsumesOfModulesBase const& iPnC,
                               edm::ModuleDescription const* module,
                               std::unordered_set<unsigned int>& consumedModules) {
     // If this node of the DAG has been processed already, no need to
     // reprocess again
     if (consumedModules.find(module->id()) != consumedModules.end()) {
       return;
     }
     consumedModules.insert(module->id());
     for (auto iBranchType = 0U; iBranchType != edm::NumBranchTypes; ++iBranchType) {
       for (auto const& c :
            iPnC.modulesWhoseProductsAreConsumedBy(module->id(), static_cast<edm::BranchType>(iBranchType))) {
         findAllConsumedModules(iPnC, c, consumedModules);
       }
     }
   }
 }  // namespace
 
 namespace edm {
   std::vector<ModuleDescription const*> nonConsumedUnscheduledModules(
       edm::PathsAndConsumesOfModulesBase const& iPnC, std::vector<ModuleProcessName>& consumedByChildren) {
     const std::string kTriggerResults("TriggerResults");
 
     std::vector<std::string> pathNames = iPnC.paths();
     const unsigned int kFirstEndPathIndex = pathNames.size();
     pathNames.insert(pathNames.end(), iPnC.endPaths().begin(), iPnC.endPaths().end());
 
     // The goal is to find modules that are not depended upon by
     // scheduled modules. To do that, we identify all modules that are
     // depended upon by scheduled modules, and do a set subtraction.
     //
     // First, denote all scheduled modules (i.e. in Paths and
     // EndPaths) as "consumers".
     std::vector<ModuleDescription const*> consumerModules;
     for (unsigned int pathIndex = 0; pathIndex != pathNames.size(); ++pathIndex) {
       std::vector<ModuleDescription const*> const* moduleDescriptions;
       if (pathIndex < kFirstEndPathIndex) {
         moduleDescriptions = &(iPnC.modulesOnPath(pathIndex));
       } else {
         moduleDescriptions = &(iPnC.modulesOnEndPath(pathIndex - kFirstEndPathIndex));
       }
       std::copy(moduleDescriptions->begin(), moduleDescriptions->end(), std::back_inserter(consumerModules));
     }
 
     // Then add TriggerResults, and all Paths and EndPaths themselves
     // to the set of "consumers" (even if they don't depend on any
     // data products, they must not be deleted). Also add anything
     // consumed by child SubProcesses to the set of "consumers".
     auto const& allModules = iPnC.allModules();
     for (auto const& description : allModules) {
       if (description->moduleLabel() == kTriggerResults or
           std::find(pathNames.begin(), pathNames.end(), description->moduleLabel()) != pathNames.end()) {
         consumerModules.push_back(description);
       } else if (std::binary_search(consumedByChildren.begin(),
                                     consumedByChildren.end(),
                                     ModuleProcessName{description->moduleLabel(), description->processName()}) or
                  std::binary_search(consumedByChildren.begin(),
                                     consumedByChildren.end(),
                                     ModuleProcessName{description->moduleLabel(), ""})) {
         consumerModules.push_back(description);
       }
     }
 
     // Find modules that have any data dependence path to any module
     // in consumerModules.
     std::unordered_set<unsigned int> consumedModules;
     for (auto& description : consumerModules) {
       findAllConsumedModules(iPnC, description, consumedModules);
     }
 
     // All other modules will then be classified as non-consumed, even
     // if they would have dependencies within them.
     std::vector<ModuleDescription const*> unusedModules;
     std::copy_if(allModules.begin(),
                  allModules.end(),
                  std::back_inserter(unusedModules),
                  [&consumedModules](ModuleDescription const* description) {
                    return consumedModules.find(description->id()) == consumedModules.end();
                  });
     return unusedModules;
   }
 
   //====================================
   // checkForCorrectness algorithm
   //
   // The code creates a 'dependency' graph between all
   // modules. A module depends on another module if
   // 1) it 'consumes' data produced by that module
   // 2) it appears directly after the module within a Path
   //
   // If there is a cycle in the 'dependency' graph then
   // the schedule may be unrunnable. The schedule is still
   // runnable if all cycles have at least two edges which
   // connect modules only by Path dependencies (i.e. not
   // linked by a data dependency).
   //
   //  Example 1:
   //  C consumes data from B
   //  Path 1: A + B + C
   //  Path 2: B + C + A
   //
   //  Cycle: A after C [p2], C consumes B, B after A [p1]
   //  Since this cycle has 2 path only edges it is OK since
   //  A and (B+C) are independent so their run order doesn't matter
   //
   //  Example 2:
   //  B consumes A
   //  C consumes B
   //  Path: C + A
   //
   //  Cycle: A after C [p], C consumes B, B consumes A
   //  Since this cycle has 1 path only edge it is unrunnable.
   //
   //  Example 3:
   //  A consumes B
   //  B consumes C
   //  C consumes A
   //  (no Path since unscheduled execution)
   //
   //  Cycle: A consumes B, B consumes C, C consumes A
   //  Since this cycle has 0 path only edges it is unrunnable.
   //====================================
 
   namespace {
     struct ModuleStatus {
       std::vector<unsigned int> dependsOn_;
       std::vector<unsigned int> pathsOn_;
       unsigned long long lastSearch = 0;
       bool onPath_ = false;
       bool wasRun_ = false;
     };
 
     struct PathStatus {
       std::vector<unsigned int> modulesOnPath_;
       unsigned long int activeModuleSlot_ = 0;
       unsigned long int nModules_ = 0;
       unsigned int index_ = 0;
       bool endPath_ = false;
     };
 
     class CircularDependencyException {};
 
     bool checkIfCanRun(unsigned long long searchIndex,
                        unsigned int iModuleToCheckID,
                        std::vector<ModuleStatus>& iModules,
                        std::vector<unsigned int>& stackTrace) {
       auto& status = iModules[iModuleToCheckID];
       if (status.wasRun_) {
         return true;
       }
 
       if (status.lastSearch == searchIndex) {
         //check to see if the module is already on the stack
         // checking searchIndex is insufficient as multiple modules
         // in this search may be dependent upon the same module
         auto itFound = std::find(stackTrace.begin(), stackTrace.end(), iModuleToCheckID);
         if (itFound != stackTrace.end()) {
           stackTrace.push_back(iModuleToCheckID);
           throw CircularDependencyException();
         }
         //we have already checked this module's dependencies during this search
         return false;
       }
       stackTrace.push_back(iModuleToCheckID);
       status.lastSearch = searchIndex;
 
       bool allDependenciesRan = true;
       for (auto index : status.dependsOn_) {
         auto& dep = iModules[index];
         if (dep.onPath_) {
           if (not dep.wasRun_) {
             allDependenciesRan = false;
           }
         } else if (not checkIfCanRun(searchIndex, index, iModules, stackTrace)) {
           allDependenciesRan = false;
         }
       }
       if (allDependenciesRan) {
         status.wasRun_ = true;
       }
       stackTrace.pop_back();
 
       return allDependenciesRan;
     }
   }  // namespace
   void checkForModuleDependencyCorrectness(edm::PathsAndConsumesOfModulesBase const& iPnC, bool iPrintDependencies) {
     constexpr auto kInvalidIndex = std::numeric_limits<unsigned int>::max();
 
     //Need to lookup ids to names quickly
     std::unordered_map<unsigned int, std::string> moduleIndexToNames;
 
     std::unordered_map<std::string, unsigned int> pathStatusInserterModuleLabelToModuleID;
 
     //for testing, state that TriggerResults is at the end of all paths
     const std::string kTriggerResults("TriggerResults");
     const std::string kPathStatusInserter("PathStatusInserter");
     const std::string kEndPathStatusInserter("EndPathStatusInserter");
     unsigned int kTriggerResultsIndex = kInvalidIndex;
     ModuleStatus triggerResultsStatus;
     unsigned int largestIndex = 0;
     for (auto const& description : iPnC.allModules()) {
       moduleIndexToNames.insert(std::make_pair(description->id(), description->moduleLabel()));
       if (kTriggerResults == description->moduleLabel()) {
         kTriggerResultsIndex = description->id();
       }
       if (description->id() > largestIndex) {
         largestIndex = description->id();
       }
       if (description->moduleName() == kPathStatusInserter) {
         triggerResultsStatus.dependsOn_.push_back(description->id());
       }
       if (description->moduleName() == kPathStatusInserter || description->moduleName() == kEndPathStatusInserter) {
         pathStatusInserterModuleLabelToModuleID[description->moduleLabel()] = description->id();
       }
     }
 
     std::vector<ModuleStatus> statusOfModules(largestIndex + 1);
     for (auto const& nameID : pathStatusInserterModuleLabelToModuleID) {
       statusOfModules[nameID.second].onPath_ = true;
       unsigned int pathIndex;
       auto const& paths = iPnC.paths();
       auto itFound = std::find(paths.begin(), paths.end(), nameID.first);
       if (itFound != paths.end()) {
         pathIndex = itFound - paths.begin();
       } else {
         auto const& endPaths = iPnC.endPaths();
         itFound = std::find(endPaths.begin(), endPaths.end(), nameID.first);
         assert(itFound != endPaths.end());
         pathIndex = itFound - endPaths.begin() + iPnC.paths().size();
       }
       statusOfModules[nameID.second].pathsOn_.push_back(pathIndex);
     }
     if (kTriggerResultsIndex != kInvalidIndex) {
       statusOfModules[kTriggerResultsIndex] = std::move(triggerResultsStatus);
     }
 
     std::vector<PathStatus> statusOfPaths(iPnC.paths().size() + iPnC.endPaths().size());
 
     //If there are no paths, no modules will run so nothing to check
     if (statusOfPaths.empty()) {
       return;
     }
 
     {
       auto nPaths = iPnC.paths().size();
       for (unsigned int p = 0; p < nPaths; ++p) {
         auto& status = statusOfPaths[p];
         status.index_ = p;
         status.modulesOnPath_.reserve(iPnC.modulesOnPath(p).size() + 1);
         std::unordered_set<unsigned int> uniqueModules;
         for (auto const& mod : iPnC.modulesOnPath(p)) {
           if (uniqueModules.insert(mod->id()).second) {
             status.modulesOnPath_.push_back(mod->id());
             statusOfModules[mod->id()].onPath_ = true;
             statusOfModules[mod->id()].pathsOn_.push_back(p);
           }
         }
         status.nModules_ = uniqueModules.size() + 1;
 
         //add the PathStatusInserter at the end
         auto found = pathStatusInserterModuleLabelToModuleID.find(iPnC.paths()[p]);
         assert(found != pathStatusInserterModuleLabelToModuleID.end());
         status.modulesOnPath_.push_back(found->second);
       }
     }
     {
       auto offset = iPnC.paths().size();
       auto nPaths = iPnC.endPaths().size();
       for (unsigned int p = 0; p < nPaths; ++p) {
         auto& status = statusOfPaths[p + offset];
         status.endPath_ = true;
         status.index_ = p;
         status.modulesOnPath_.reserve(iPnC.modulesOnEndPath(p).size() + 1);
         std::unordered_set<unsigned int> uniqueModules;
         for (auto const& mod : iPnC.modulesOnEndPath(p)) {
           if (uniqueModules.insert(mod->id()).second) {
             status.modulesOnPath_.push_back(mod->id());
             statusOfModules[mod->id()].onPath_ = true;
             statusOfModules[mod->id()].pathsOn_.push_back(p + offset);
           }
         }
         status.nModules_ = uniqueModules.size() + 1;
 
         //add the EndPathStatusInserter at the end
         auto found = pathStatusInserterModuleLabelToModuleID.find(iPnC.endPaths()[p]);
         assert(found != pathStatusInserterModuleLabelToModuleID.end());
         status.modulesOnPath_.push_back(found->second);
       }
     }
 
     for (auto const& description : iPnC.allModules()) {
       unsigned int const moduleIndex = description->id();
       auto const& dependentModules = iPnC.modulesWhoseProductsAreConsumedBy(moduleIndex);
       auto& deps = statusOfModules[moduleIndex];
       deps.dependsOn_.reserve(dependentModules.size());
       for (auto const& depDescription : dependentModules) {
         if (iPrintDependencies) {
           edm::LogAbsolute("ModuleDependency")
               << "ModuleDependency '" << description->moduleLabel() << "' depends on data products from module '"
               << depDescription->moduleLabel() << "'";
         }
         deps.dependsOn_.push_back(depDescription->id());
       }
     }
 
     unsigned int nPathsFinished = 0;
 
     //if a circular dependency exception happens, stackTrace has the info
     std::vector<unsigned int> stackTrace;
     bool madeForwardProgress = true;
     try {
       //'simulate' the running of the paths. On each step mark each module as 'run'
       // if all the module's dependencies were fulfilled in a previous step
       unsigned long long searchIndex = 0;
       while (madeForwardProgress and nPathsFinished != statusOfPaths.size()) {
         madeForwardProgress = false;
         for (auto& p : statusOfPaths) {
           //the path has already completed in an earlier pass
           if (p.activeModuleSlot_ == p.nModules_) {
             continue;
           }
           ++searchIndex;
           bool didRun = checkIfCanRun(searchIndex, p.modulesOnPath_[p.activeModuleSlot_], statusOfModules, stackTrace);
           if (didRun) {
             madeForwardProgress = true;
             ++p.activeModuleSlot_;
             if (p.activeModuleSlot_ == p.nModules_) {
               ++nPathsFinished;
             }
           }
         }
       }
     } catch (CircularDependencyException const&) {
       //the last element in stackTrace must appear somewhere earlier in stackTrace
       std::ostringstream oStr;
 
       unsigned int lastIndex = stackTrace.front();
       bool firstSkipped = false;
       for (auto id : stackTrace) {
         if (firstSkipped) {
           oStr << "  module '" << moduleIndexToNames[lastIndex] << "' depends on " << moduleIndexToNames[id] << "\n";
         } else {
           firstSkipped = true;
         }
         lastIndex = id;
       }
       throw edm::Exception(edm::errors::ScheduleExecutionFailure, "Unrunnable schedule\n")
           << "Circular module dependency found in configuration\n"
           << oStr.str();
     }
 
     auto pathName = [&](PathStatus const& iP) {
       if (iP.endPath_) {
         return iPnC.endPaths()[iP.index_];
       }
       return iPnC.paths()[iP.index_];
     };
 
     //The program would deadlock
     if (not madeForwardProgress) {
       std::ostringstream oStr;
       auto modIndex = std::numeric_limits<unsigned int>::max();
       unsigned int presentPath;
       for (auto itP = statusOfPaths.begin(); itP != statusOfPaths.end(); ++itP) {
         auto const& p = *itP;
         if (p.activeModuleSlot_ == p.nModules_) {
           continue;
         }
         //this path is stuck
         modIndex = p.modulesOnPath_[p.activeModuleSlot_];
         presentPath = itP - statusOfPaths.begin();
         break;
       }
       //NOTE the following should always be true as at least 1 path should be stuc.
       // I've added the condition just to be paranoid.
       if (modIndex != std::numeric_limits<unsigned int>::max()) {
         struct ProgressInfo {
           ProgressInfo(unsigned int iMod, unsigned int iPath, bool iPreceeds = false)
               : moduleIndex_(iMod), pathIndex_(iPath), preceeds_(iPreceeds) {}
 
           ProgressInfo(unsigned int iMod) : moduleIndex_(iMod), pathIndex_{}, preceeds_(false) {}
 
           unsigned int moduleIndex_ = std::numeric_limits<unsigned int>::max();
           std::optional<unsigned int> pathIndex_;
           bool preceeds_;
 
           bool operator==(ProgressInfo const& iOther) const {
             return moduleIndex_ == iOther.moduleIndex_ and pathIndex_ == iOther.pathIndex_;
           }
         };
 
         std::vector<ProgressInfo> progressTrace;
         progressTrace.emplace_back(modIndex, presentPath);
 
         //The following starts from the first found unrun module on a path. It then finds
         // the first modules it depends on that was not run. If that module is on a Task
         // it then repeats the check for that module's dependencies. If that module is on
         // a path, it checks to see if that module is the first unrun module of a path
         // and if so it repeats the check for that module's dependencies, if not it
         // checks the dependencies of the stuck module on that path.
         // Eventually, all these checks should allow us to find a cycle of modules.
 
         //NOTE: the only way foundUnrunModule should ever by false by the end of the
         // do{}while loop is if there is a bug in the algorithm. I've included it to
         // try to avoid that case causing an infinite loop in the program.
         bool foundUnrunModule;
         do {
           //check dependencies looking for stuff not run and on a path
           foundUnrunModule = false;
           for (auto depMod : statusOfModules[modIndex].dependsOn_) {
             auto const& depStatus = statusOfModules[depMod];
             if (not depStatus.wasRun_ and depStatus.onPath_) {
               foundUnrunModule = true;
               //last run on a path?
               bool lastOnPath = false;
               unsigned int foundPath;
               for (auto pathOn : depStatus.pathsOn_) {
                 auto const& depPaths = statusOfPaths[pathOn];
                 if (depPaths.modulesOnPath_[depPaths.activeModuleSlot_] == depMod) {
                   lastOnPath = true;
                   foundPath = pathOn;
                   break;
                 }
               }
               if (lastOnPath) {
                 modIndex = depMod;
                 progressTrace.emplace_back(modIndex, foundPath);
               } else {
                 //some earlier module on the same path is stuck
                 progressTrace.emplace_back(depMod, depStatus.pathsOn_[0]);
                 auto const& depPath = statusOfPaths[depStatus.pathsOn_[0]];
                 modIndex = depPath.modulesOnPath_[depPath.activeModuleSlot_];
                 progressTrace.emplace_back(modIndex, depStatus.pathsOn_[0], true);
               }
               break;
             }
           }
           if (not foundUnrunModule) {
             //check unscheduled modules
             for (auto depMod : statusOfModules[modIndex].dependsOn_) {
               auto const& depStatus = statusOfModules[depMod];
               if (not depStatus.wasRun_ and not depStatus.onPath_) {
                 foundUnrunModule = true;
                 progressTrace.emplace_back(depMod);
                 modIndex = depMod;
                 break;
               }
             }
           }
         } while (foundUnrunModule and (0 == std::count(progressTrace.begin(),
                                                        progressTrace.begin() + progressTrace.size() - 1,
                                                        progressTrace.back())));
 
         auto printTrace = [&](auto& oStr, auto itBegin, auto itEnd) {
           for (auto itTrace = itBegin; itTrace != itEnd; ++itTrace) {
             if (itTrace != itBegin) {
               if (itTrace->preceeds_) {
                 oStr << " and follows module '" << moduleIndexToNames[itTrace->moduleIndex_] << "' on the path\n";
               } else {
                 oStr << " and depends on module '" << moduleIndexToNames[itTrace->moduleIndex_] << "'\n";
               }
             }
             if (itTrace + 1 != itEnd) {
               if (itTrace->pathIndex_) {
                 oStr << "  module '" << moduleIndexToNames[itTrace->moduleIndex_] << "' is on path '"
                      << pathName(statusOfPaths[*itTrace->pathIndex_]) << "'";
               } else {
                 oStr << "  module '" << moduleIndexToNames[itTrace->moduleIndex_] << "' is in a task";
               }
             }
           }
         };
 
         if (not foundUnrunModule) {
           //If we get here, this suggests a problem with either the algorithm that finds problems or the algorithm
           // that attempts to report the problem
           oStr << "Algorithm Error, unable to find problem. Contact framework group.\n Traced problem this far\n";
           printTrace(oStr, progressTrace.begin(), progressTrace.end());
         } else {
           printTrace(
               oStr, std::find(progressTrace.begin(), progressTrace.end(), progressTrace.back()), progressTrace.end());
         }
       }
       //the schedule deadlocked
       throw edm::Exception(edm::errors::ScheduleExecutionFailure, "Unrunnable schedule\n")
           << "The Path/EndPath configuration could cause the job to deadlock\n"
           << oStr.str();
     }
 
     //NOTE: although the following conditions are not needed for safe running, they are
     // policy choices the collaboration has made.
 
     //Check to see if for each path if the order of the modules is correct based on dependencies
     for (auto& p : statusOfPaths) {
       for (unsigned long int i = 0; p.nModules_ > 0 and i < p.nModules_ - 1; ++i) {
         auto moduleID = p.modulesOnPath_[i];
         if (not statusOfModules[moduleID].dependsOn_.empty()) {
           for (unsigned long int j = i + 1; j < p.nModules_; ++j) {
             auto testModuleID = p.modulesOnPath_[j];
             for (auto depModuleID : statusOfModules[moduleID].dependsOn_) {
               if (depModuleID == testModuleID) {
                 throw edm::Exception(edm::errors::ScheduleExecutionFailure, "Unrunnable schedule\n")
                     << "Dependent module later on Path\n"
                     << "  module '" << moduleIndexToNames[moduleID] << "' depends on '"
                     << moduleIndexToNames[depModuleID] << "' which is later on path " << pathName(p);
               }
             }
           }
         }
       }
     }
 
     //HLT wants all paths to be equivalent. If a path has a module A that needs data from module B and module B appears on one path
     // as module A then B must appear on ALL paths that have A.
     unsigned int modIndex = 0;
     for (auto& mod : statusOfModules) {
       for (auto& depIndex : mod.dependsOn_) {
         std::size_t count = 0;
         std::size_t nonEndPaths = 0;
         for (auto modPathID : mod.pathsOn_) {
           if (statusOfPaths[modPathID].endPath_) {
             continue;
           }
           ++nonEndPaths;
           for (auto depPathID : statusOfModules[depIndex].pathsOn_) {
             if (depPathID == modPathID) {
               ++count;
               break;
             }
           }
         }
         if (count != 0 and count != nonEndPaths) {
           std::ostringstream onStr;
           std::ostringstream missingStr;
 
           for (auto modPathID : mod.pathsOn_) {
             if (statusOfPaths[modPathID].endPath_) {
               continue;
             }
             bool found = false;
             for (auto depPathID : statusOfModules[depIndex].pathsOn_) {
               if (depPathID == modPathID) {
                 found = true;
               }
             }
             auto& s = statusOfPaths[modPathID];
             if (found) {
               onStr << pathName(s) << " ";
             } else {
               missingStr << pathName(s) << " ";
             }
           }
           throw edm::Exception(edm::errors::ScheduleExecutionFailure, "Unrunnable schedule\n")
               << "Paths are non consistent\n"
               << "  module '" << moduleIndexToNames[modIndex] << "' depends on '" << moduleIndexToNames[depIndex]
               << "' which appears on paths\n  " << onStr.str() << "\nbut is missing from\n  " << missingStr.str();
         }
       }
       ++modIndex;
     }
   }
 }  // namespace edm

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