mirror of
https://github.com/Icinga/icinga2.git
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399 lines
11 KiB
C++
399 lines
11 KiB
C++
/******************************************************************************
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* Icinga 2 *
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* Copyright (C) 2012-2014 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.hpp"
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#include "base/logger.hpp"
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#include "base/debug.hpp"
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#include "base/utility.hpp"
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#include "base/exception.hpp"
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#include <boost/bind.hpp>
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#include <iostream>
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using namespace icinga;
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int ThreadPool::m_NextID = 1;
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ThreadPool::ThreadPool(size_t max_threads)
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: m_ID(m_NextID++), m_MaxThreads(max_threads), m_Stopped(false)
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{
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if (m_MaxThreads != UINT_MAX && m_MaxThreads < sizeof(m_Queues) / sizeof(m_Queues[0]))
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m_MaxThreads = sizeof(m_Queues) / sizeof(m_Queues[0]);
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Start();
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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(true);
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}
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void ThreadPool::Start(void)
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{
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for (size_t i = 0; i < sizeof(m_Queues) / sizeof(m_Queues[0]); i++)
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m_Queues[i].SpawnWorker(m_ThreadGroup);
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m_ThreadGroup.create_thread(boost::bind(&ThreadPool::ManagerThreadProc, this));
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}
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void ThreadPool::Stop(void)
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{
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for (size_t i = 0; i < sizeof(m_Queues) / sizeof(m_Queues[0]); i++) {
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boost::mutex::scoped_lock lock(m_Queues[i].Mutex);
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m_Queues[i].Stopped = true;
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m_Queues[i].CV.notify_all();
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}
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boost::mutex::scoped_lock lock(m_MgmtMutex);
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m_Stopped = true;
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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(bool wait_for_stop)
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{
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if (wait_for_stop) {
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m_ThreadGroup.join_all();
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return;
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}
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for (size_t i = 0; i < sizeof(m_Queues) / sizeof(m_Queues[0]); i++) {
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boost::mutex::scoped_lock lock(m_Queues[i].Mutex);
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while (!m_Queues[i].Items.empty())
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m_Queues[i].CVStarved.wait(lock);
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}
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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::WorkerThread::ThreadProc(Queue& queue)
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{
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std::ostringstream idbuf;
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idbuf << "Q #" << &queue << " W #" << this;
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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(queue.Mutex);
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UpdateUtilization(ThreadIdle);
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while (queue.Items.empty() && !queue.Stopped && !Zombie) {
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if (queue.Items.empty())
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queue.CVStarved.notify_all();
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queue.CV.wait(lock);
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}
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if (Zombie)
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break;
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if (queue.Items.empty() && queue.Stopped)
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break;
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wi = queue.Items.front();
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queue.Items.pop_front();
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UpdateUtilization(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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if (wi.Callback)
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wi.Callback();
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} catch (const std::exception& ex) {
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Log(LogCritical, "ThreadPool")
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<< "Exception thrown in event handler:\n"
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<< DiagnosticInformation(ex);
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} catch (...) {
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Log(LogCritical, "ThreadPool", "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(queue.Mutex);
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queue.WaitTime += latency;
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queue.ServiceTime += et - st;
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queue.TaskCount++;
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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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Log(LogWarning, "ThreadPool")
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# ifdef RUSAGE_THREAD
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<< "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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<< "Event call took " << (et - st) << "s";
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# endif /* RUSAGE_THREAD */
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}
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#endif /* _DEBUG */
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}
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boost::mutex::scoped_lock lock(queue.Mutex);
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UpdateUtilization(ThreadDead);
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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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* @param policy The scheduling policy
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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, SchedulerPolicy policy)
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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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Queue& queue = m_Queues[Utility::Random() % (sizeof(m_Queues) / sizeof(m_Queues[0]))];
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{
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boost::mutex::scoped_lock lock(queue.Mutex);
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if (queue.Stopped)
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return false;
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if (policy == LowLatencyScheduler)
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queue.SpawnWorker(m_ThreadGroup);
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queue.Items.push_back(wi);
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queue.CV.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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double lastStats = 0;
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for (;;) {
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size_t total_pending = 0, total_alive = 0;
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double total_avg_latency = 0;
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double total_utilization = 0;
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{
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boost::mutex::scoped_lock lock(m_MgmtMutex);
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if (!m_Stopped)
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m_MgmtCV.timed_wait(lock, boost::posix_time::milliseconds(500));
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if (m_Stopped)
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break;
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}
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for (size_t i = 0; i < sizeof(m_Queues) / sizeof(m_Queues[0]); i++) {
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size_t pending, alive = 0;
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double avg_latency;
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double utilization = 0;
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Queue& queue = m_Queues[i];
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boost::mutex::scoped_lock lock(queue.Mutex);
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for (size_t i = 0; i < sizeof(queue.Threads) / sizeof(queue.Threads[0]); i++)
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queue.Threads[i].UpdateUtilization();
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pending = queue.Items.size();
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for (size_t i = 0; i < sizeof(queue.Threads) / sizeof(queue.Threads[0]); i++) {
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if (queue.Threads[i].State != ThreadDead && !queue.Threads[i].Zombie) {
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alive++;
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utilization += queue.Threads[i].Utilization * 100;
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}
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}
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utilization /= alive;
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if (queue.TaskCount > 0)
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avg_latency = queue.WaitTime / (queue.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 = std::ceil((utilization * alive) / 80.0);
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int tthreads = wthreads - alive;
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/* Make sure there is at least one thread per CPU */
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int ncput = std::max(boost::thread::hardware_concurrency() / QUEUECOUNT, 4U);
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if (alive + tthreads < ncput)
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tthreads = ncput - alive;
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/* Don't kill more than 8 threads at once. */
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if (tthreads < -8)
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tthreads = -8;
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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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if (m_MaxThreads != UINT_MAX && (alive + tthreads) * (sizeof(m_Queues) / sizeof(m_Queues[0])) > m_MaxThreads)
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tthreads = m_MaxThreads / (sizeof(m_Queues) / sizeof(m_Queues[0])) - alive;
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if (tthreads != 0) {
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Log(LogNotice, "ThreadPool")
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<< "Thread pool; current: " << alive << "; adjustment: " << tthreads;
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}
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for (int i = 0; i < -tthreads; i++)
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queue.KillWorker(m_ThreadGroup);
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for (int i = 0; i < tthreads; i++)
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queue.SpawnWorker(m_ThreadGroup);
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}
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queue.WaitTime = 0;
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queue.ServiceTime = 0;
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queue.TaskCount = 0;
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total_pending += pending;
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total_alive += alive;
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total_avg_latency += avg_latency;
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total_utilization += utilization;
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}
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double now = Utility::GetTime();
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if (lastStats < now - 15) {
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lastStats = now;
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Log(LogNotice, "ThreadPool")
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<< "Pool #" << m_ID << ": Pending tasks: " << total_pending << "; Average latency: "
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<< (long)(total_avg_latency * 1000 / (sizeof(m_Queues) / sizeof(m_Queues[0]))) << "ms"
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<< "; Threads: " << total_alive
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<< "; Pool utilization: " << (total_utilization / (sizeof(m_Queues) / sizeof(m_Queues[0]))) << "%";
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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::Queue::SpawnWorker(boost::thread_group& group)
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{
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for (size_t i = 0; i < sizeof(Threads) / sizeof(Threads[0]); i++) {
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if (Threads[i].State == ThreadDead) {
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Log(LogDebug, "ThreadPool", "Spawning worker thread.");
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Threads[i] = WorkerThread(ThreadIdle);
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Threads[i].Thread = group.create_thread(boost::bind(&ThreadPool::WorkerThread::ThreadProc, boost::ref(Threads[i]), boost::ref(*this)));
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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 Mutex.
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*/
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void ThreadPool::Queue::KillWorker(boost::thread_group& group)
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{
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for (size_t i = 0; i < sizeof(Threads) / sizeof(Threads[0]); i++) {
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if (Threads[i].State == ThreadIdle && !Threads[i].Zombie) {
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Log(LogDebug, "ThreadPool", "Killing worker thread.");
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group.remove_thread(Threads[i].Thread);
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Threads[i].Thread->detach();
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delete Threads[i].Thread;
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Threads[i].Zombie = true;
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CV.notify_all();
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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 queue Mutex.
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*/
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void ThreadPool::WorkerThread::UpdateUtilization(ThreadState state)
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{
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double utilization;
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switch (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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VERIFY(0);
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}
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double now = Utility::GetTime();
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double time = now - 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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Utilization = (Utilization * (avg_time - time) + utilization * time) / avg_time;
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LastUpdate = now;
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if (state != ThreadUnspecified)
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State = state;
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}
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