MonitorThreadOccupancy.cxx

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/*
  Copyright (C) 2002-2026 CERN for the benefit of the ATLAS collaboration
*/
 
#include "MonitorThreadOccupancy.h"
#include "../counters/CounterThread.h"
#include <algorithm> // std::min, max
#include <sstream>
#include <iomanip>
#include <limits> //std::numeric_limits<uint64_t>::max();
 
MonitorThreadOccupancy::MonitorThreadOccupancy(const std::string& name, const MonitoredRange* parent)
  : MonitorBase(name, parent),
  m_threadToCounterMap(),
  m_threadCounter(0) {}
 
 
StatusCode MonitorThreadOccupancy::newEvent(const CostData& data, const float weight) {
  // Only look at events in the master slot
  if (not data.isMasterSlot()) {
    return StatusCode::SUCCESS;
  }
 
  // Check if we ran with EnableMultiSlot=true - in the master slot (online slot) there are algorithms executed on different slot
  bool isMultiSlot = false;
  for (const xAOD::TrigComposite* tc : data.costCollection()) {
    const uint32_t slot = tc->getDetail<uint32_t>("slot");
    if (slot != data.onlineSlot()){
      isMultiSlot = true;
      break;
    }
  }
 
  if (!isMultiSlot){
    ATH_MSG_DEBUG("Saving data from multiple slots to master slot was not enabled - ThreadOccupancy Monitoring won't be executed");
    return StatusCode::SUCCESS; 
  }
 
  for (const xAOD::TrigComposite* tc : data.costCollection()) {
    const uint32_t threadID = tc->getDetail<uint32_t>("thread");
    if (m_threadToCounterMap.count(threadID) == 0) {
      std::stringstream threadIDStr;
      threadIDStr << "Thread_" << std::setfill('0') << std::setw(5) << threadID;
      m_threadToCounterMap[threadID] = threadIDStr.str();
    }
    ATH_CHECK( getCounter(m_threadToCounterMap[threadID])->newEvent(data, tc->index(), weight) );
  }
 
  ATH_CHECK( postProcess(weight) );
 
 
  return StatusCode::SUCCESS; 
}
 
 
StatusCode MonitorThreadOccupancy::postProcess(float weight) {
  uint64_t lowTimestamp = std::numeric_limits<uint64_t>::max();
  uint64_t highTimestamp = 0;
  for (const auto& nameCounterPair : m_counters) {
    const CounterThread* ptr = dynamic_cast<const CounterThread*>(nameCounterPair.second.get());
    if (ptr){
      lowTimestamp = std::min(lowTimestamp, ptr->getLowTimestamp());
      highTimestamp = std::max(highTimestamp, ptr->getHighTimestamp());
    }
  }
  for (auto& nameCounterPair : m_counters) {
    CounterThread* ptr = dynamic_cast<CounterThread*>(nameCounterPair.second.get());
    if (!ptr)[[unlikely]] {
      ATH_MSG_WARNING ("MonitorThreadOccupancy::postProcess: dynamic cast failure" );
      continue;
    }
    ptr->setAllThreadsTimestamps(lowTimestamp, highTimestamp);
    ATH_CHECK( ptr->postProcess(weight) );
  }
  return StatusCode::SUCCESS;
}
 
 
std::unique_ptr<CounterBase> MonitorThreadOccupancy::newCounter(const std::string& name) {
  return std::make_unique<CounterThread>(name, this);
}