mirror of https://github.com/Icinga/icinga2.git
376 lines
9.5 KiB
C++
376 lines
9.5 KiB
C++
/******************************************************************************
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* Icinga 2 *
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* Copyright (C) 2012-2013 Icinga Development Team (http://www.icinga.org/) *
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* *
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* This program is free software; you can redistribute it and/or *
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* modify it under the terms of the GNU General Public License *
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* as published by the Free Software Foundation; either version 2 *
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* of the License, or (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, write to the Free Software Foundation *
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. *
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******************************************************************************/
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#include "base/threadpool.h"
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#include "base/logger_fwd.h"
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#include "base/convert.h"
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#include "base/debug.h"
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#include "base/utility.h"
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#include "base/scriptvariable.h"
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#include <sstream>
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#include <iostream>
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#include <boost/bind.hpp>
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#include <boost/exception/diagnostic_information.hpp>
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#include <boost/foreach.hpp>
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using namespace icinga;
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int ThreadPool::m_NextID = 1;
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ThreadPool::ThreadPool(void)
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: m_ID(m_NextID++), m_WaitTime(0), m_ServiceTime(0),
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m_TaskCount(0), m_Stopped(false)
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{
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for (int i = 0; i < 2; i++)
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SpawnWorker();
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m_Threads.create_thread(boost::bind(&ThreadPool::ManagerThreadProc, this));
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m_Threads.create_thread(boost::bind(&ThreadPool::StatsThreadProc, this));
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}
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ThreadPool::~ThreadPool(void)
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{
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Stop();
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Join();
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}
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void ThreadPool::Stop(void)
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{
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boost::mutex::scoped_lock lock(m_Mutex);
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m_Stopped = true;
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m_WorkCV.notify_all();
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m_MgmtCV.notify_all();
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}
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/**
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* Waits for all worker threads to finish.
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*/
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void ThreadPool::Join(void)
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{
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{
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boost::mutex::scoped_lock lock(m_Mutex);
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while (!m_Stopped || !m_WorkItems.empty()) {
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lock.unlock();
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Utility::Sleep(0.5);
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lock.lock();
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}
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}
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m_Threads.join_all();
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}
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/**
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* Waits for work items and processes them.
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*/
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void ThreadPool::QueueThreadProc(int tid)
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{
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std::ostringstream idbuf;
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idbuf << "TP #" << m_ID << " W #" << tid;
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Utility::SetThreadName(idbuf.str());
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for (;;) {
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WorkItem wi;
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{
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boost::mutex::scoped_lock lock(m_Mutex);
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UpdateThreadUtilization(tid, ThreadIdle);
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while (m_WorkItems.empty() && !m_Stopped && !m_ThreadStats[tid].Zombie)
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m_WorkCV.wait(lock);
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if (m_ThreadStats[tid].Zombie)
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break;
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if (m_WorkItems.empty() && m_Stopped)
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break;
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wi = m_WorkItems.front();
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m_WorkItems.pop_front();
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UpdateThreadUtilization(tid, ThreadBusy);
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}
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double st = Utility::GetTime();;
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#ifdef _DEBUG
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# ifdef RUSAGE_THREAD
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struct rusage usage_start, usage_end;
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(void) getrusage(RUSAGE_THREAD, &usage_start);
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# endif /* RUSAGE_THREAD */
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#endif /* _DEBUG */
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try {
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wi.Callback();
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} catch (const std::exception& ex) {
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std::ostringstream msgbuf;
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msgbuf << "Exception thrown in event handler: " << std::endl
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<< boost::diagnostic_information(ex);
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Log(LogCritical, "base", msgbuf.str());
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} catch (...) {
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Log(LogCritical, "base", "Exception of unknown type thrown in event handler.");
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}
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double et = Utility::GetTime();
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double latency = st - wi.Timestamp;
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{
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boost::mutex::scoped_lock lock(m_Mutex);
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m_WaitTime += latency;
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m_ServiceTime += et - st;
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m_TaskCount++;
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if (latency > m_MaxLatency)
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m_MaxLatency = latency;
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}
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#ifdef _DEBUG
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# ifdef RUSAGE_THREAD
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(void) getrusage(RUSAGE_THREAD, &usage_end);
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double duser = (usage_end.ru_utime.tv_sec - usage_start.ru_utime.tv_sec) +
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(usage_end.ru_utime.tv_usec - usage_start.ru_utime.tv_usec) / 1000000.0;
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double dsys = (usage_end.ru_stime.tv_sec - usage_start.ru_stime.tv_sec) +
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(usage_end.ru_stime.tv_usec - usage_start.ru_stime.tv_usec) / 1000000.0;
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double dwait = (et - st) - (duser + dsys);
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int dminfaults = usage_end.ru_minflt - usage_start.ru_minflt;
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int dmajfaults = usage_end.ru_majflt - usage_start.ru_majflt;
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int dvctx = usage_end.ru_nvcsw - usage_start.ru_nvcsw;
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int divctx = usage_end.ru_nivcsw - usage_start.ru_nivcsw;
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# endif /* RUSAGE_THREAD */
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if (et - st > 0.5) {
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std::ostringstream msgbuf;
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# ifdef RUSAGE_THREAD
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msgbuf << "Event call took user:" << duser << "s, system:" << dsys << "s, wait:" << dwait << "s, minor_faults:" << dminfaults << ", major_faults:" << dmajfaults << ", voluntary_csw:" << dvctx << ", involuntary_csw:" << divctx;
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# else
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msgbuf << "Event call took " << (et - st) << "s";
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# endif /* RUSAGE_THREAD */
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Log(LogWarning, "base", msgbuf.str());
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}
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#endif /* _DEBUG */
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}
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boost::mutex::scoped_lock lock(m_Mutex);
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UpdateThreadUtilization(tid, ThreadDead);
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m_ThreadStats[tid].Zombie = false;
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}
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/**
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* Appends a work item to the work queue. Work items will be processed in FIFO order.
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*
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* @param callback The callback function for the work item.
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* @returns true if the item was queued, false otherwise.
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*/
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bool ThreadPool::Post(const ThreadPool::WorkFunction& callback)
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{
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WorkItem wi;
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wi.Callback = callback;
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wi.Timestamp = Utility::GetTime();
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{
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boost::mutex::scoped_lock lock(m_Mutex);
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if (m_Stopped)
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return false;
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m_WorkItems.push_back(wi);
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m_WorkCV.notify_one();
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}
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return true;
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}
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void ThreadPool::ManagerThreadProc(void)
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{
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std::ostringstream idbuf;
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idbuf << "TP #" << m_ID << " Manager";
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Utility::SetThreadName(idbuf.str());
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for (;;) {
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size_t pending, alive;
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double avg_latency, max_latency;
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double utilization = 0;
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{
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boost::mutex::scoped_lock lock(m_Mutex);
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if (!m_Stopped)
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m_MgmtCV.timed_wait(lock, boost::posix_time::seconds(5));
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if (m_Stopped)
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break;
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pending = m_WorkItems.size();
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alive = 0;
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for (size_t i = 0; i < sizeof(m_ThreadStats) / sizeof(m_ThreadStats[0]); i++) {
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if (m_ThreadStats[i].State != ThreadDead && !m_ThreadStats[i].Zombie) {
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alive++;
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utilization += m_ThreadStats[i].Utilization * 100;
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}
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}
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utilization /= alive;
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if (m_TaskCount > 0)
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avg_latency = m_WaitTime / (m_TaskCount * 1.0);
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else
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avg_latency = 0;
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if (utilization < 60 || utilization > 80 || alive < 8) {
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double wthreads = ceil((utilization * alive) / 80.0);
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int tthreads = wthreads - alive;
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/* Don't ever kill the last 8 threads. */
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if (alive + tthreads < 8)
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tthreads = 8 - alive;
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/* Spawn more workers if there are outstanding work items. */
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if (tthreads > 0 && pending > 0)
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tthreads = 8;
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std::ostringstream msgbuf;
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msgbuf << "Thread pool; current: " << alive << "; adjustment: " << tthreads;
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Log(LogDebug, "base", msgbuf.str());
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for (int i = 0; i < -tthreads; i++)
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KillWorker();
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for (int i = 0; i < tthreads; i++)
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SpawnWorker();
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}
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m_WaitTime = 0;
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m_ServiceTime = 0;
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m_TaskCount = 0;
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max_latency = m_MaxLatency;
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m_MaxLatency = 0;
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}
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std::ostringstream msgbuf;
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msgbuf << "Pending tasks: " << pending << "; Average latency: "
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<< (long)(avg_latency * 1000) << "ms"
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<< "; Max latency: " << (long)(max_latency * 1000) << "ms"
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<< "; Threads: " << alive
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<< "; Pool utilization: " << utilization << "%";
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Log(LogInformation, "base", msgbuf.str());
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}
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}
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/**
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* Note: Caller must hold m_Mutex
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*/
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void ThreadPool::SpawnWorker(void)
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{
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for (size_t i = 0; i < sizeof(m_ThreadStats) / sizeof(m_ThreadStats[0]); i++) {
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if (m_ThreadStats[i].State == ThreadDead) {
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Log(LogDebug, "debug", "Spawning worker thread.");
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m_ThreadStats[i] = ThreadStats(ThreadIdle);
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m_Threads.create_thread(boost::bind(&ThreadPool::QueueThreadProc, this, i));
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break;
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}
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}
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}
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/**
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* Note: Caller must hold m_Mutex.
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*/
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void ThreadPool::KillWorker(void)
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{
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for (size_t i = 0; i < sizeof(m_ThreadStats) / sizeof(m_ThreadStats[0]); i++) {
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if (m_ThreadStats[i].State == ThreadIdle && !m_ThreadStats[i].Zombie) {
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Log(LogDebug, "base", "Killing worker thread.");
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m_ThreadStats[i].Zombie = true;
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m_WorkCV.notify_all();
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break;
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}
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}
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}
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void ThreadPool::StatsThreadProc(void)
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{
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std::ostringstream idbuf;
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idbuf << "TP #" << m_ID << " Stats";
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Utility::SetThreadName(idbuf.str());
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for (;;) {
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boost::mutex::scoped_lock lock(m_Mutex);
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if (!m_Stopped)
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m_MgmtCV.timed_wait(lock, boost::posix_time::milliseconds(250));
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if (m_Stopped)
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break;
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for (size_t i = 0; i < sizeof(m_ThreadStats) / sizeof(m_ThreadStats[0]); i++)
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UpdateThreadUtilization(i);
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}
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}
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/**
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* Note: Caller must hold m_Mutex.
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*/
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void ThreadPool::UpdateThreadUtilization(int tid, ThreadState state)
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{
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double utilization;
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switch (m_ThreadStats[tid].State) {
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case ThreadDead:
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return;
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case ThreadIdle:
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utilization = 0;
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break;
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case ThreadBusy:
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utilization = 1;
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break;
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default:
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ASSERT(0);
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}
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double now = Utility::GetTime();
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double time = now - m_ThreadStats[tid].LastUpdate;
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const double avg_time = 5.0;
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if (time > avg_time)
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time = avg_time;
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m_ThreadStats[tid].Utilization = (m_ThreadStats[tid].Utilization * (avg_time - time) + utilization * time) / avg_time;
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m_ThreadStats[tid].LastUpdate = now;
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if (state != ThreadUnspecified)
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m_ThreadStats[tid].State = state;
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}
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