mirror of https://gitee.com/bigwinds/arangodb
479 lines
15 KiB
C++
479 lines
15 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2014-2016 ArangoDB GmbH, Cologne, Germany
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/// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
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///
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/// Licensed under the Apache License, Version 2.0 (the "License");
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/// you may not use this file except in compliance with the License.
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/// You may obtain a copy of the License at
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///
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/// http://www.apache.org/licenses/LICENSE-2.0
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///
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/// Unless required by applicable law or agreed to in writing, software
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/// distributed under the License is distributed on an "AS IS" BASIS,
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/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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/// See the License for the specific language governing permissions and
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/// limitations under the License.
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///
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/// Copyright holder is ArangoDB GmbH, Cologne, Germany
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///
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/// @author Dr. Frank Celler
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////////////////////////////////////////////////////////////////////////////////
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#include "WorkMonitor.h"
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#include "Basics/Mutex.h"
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#include "Basics/MutexLocker.h"
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#include "Basics/tri-strings.h"
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#include "velocypack/Builder.h"
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#include "velocypack/Dumper.h"
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#include "velocypack/Sink.h"
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#include "velocypack/velocypack-aliases.h"
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#include <boost/lockfree/queue.hpp>
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using namespace arangodb;
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using namespace triagens::basics;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief singleton
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////////////////////////////////////////////////////////////////////////////////
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static WorkMonitor WORK_MONITOR;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief current work item
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////////////////////////////////////////////////////////////////////////////////
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static thread_local Thread* CURRENT_THREAD = nullptr;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief current work item
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////////////////////////////////////////////////////////////////////////////////
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static thread_local WorkDescription* CURRENT_WORK_DESCRIPTION = nullptr;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief all known threads
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////////////////////////////////////////////////////////////////////////////////
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static std::set<Thread*> THREADS;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief guard for THREADS
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////////////////////////////////////////////////////////////////////////////////
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static Mutex THREADS_LOCK;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief list of free descriptions
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////////////////////////////////////////////////////////////////////////////////
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static boost::lockfree::queue<WorkDescription*> EMPTY_WORK_DESCRIPTION(128);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief list of freeable descriptions
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////////////////////////////////////////////////////////////////////////////////
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static boost::lockfree::queue<WorkDescription*> FREEABLE_WORK_DESCRIPTION(128);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief tasks that want an overview
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////////////////////////////////////////////////////////////////////////////////
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static boost::lockfree::queue<uint64_t> WORK_OVERVIEW(128);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief stopped flag
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////////////////////////////////////////////////////////////////////////////////
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static std::atomic<bool> WORK_MONITOR_STOPPED(true);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief deletes a description and its resources
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////////////////////////////////////////////////////////////////////////////////
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static void deleteWorkDescription(WorkDescription* desc, bool stopped) {
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if (desc->_destroy) {
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switch (desc->_type) {
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case WorkType::THREAD:
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case WorkType::CUSTOM:
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break;
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case WorkType::HANDLER:
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WorkMonitor::DELETE_HANDLER(desc);
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break;
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}
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}
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if (stopped) {
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// we'll be getting here if the work monitor thread is already shut down
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// and cannot delete anything anymore. this means we ourselves are
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// responsible for cleaning up!
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delete desc;
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return;
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}
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// while the work monitor thread is still active, push the item on the
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// work monitor's cleanup list for destruction
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EMPTY_WORK_DESCRIPTION.push(desc);
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief vpack representation of a work description
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////////////////////////////////////////////////////////////////////////////////
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static void vpackWorkDescription(VPackBuilder* b, WorkDescription* desc) {
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switch (desc->_type) {
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case WorkType::THREAD:
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b->add("type", VPackValue("thread"));
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b->add("name", VPackValue(desc->_data.thread->name()));
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b->add("status", VPackValue(VPackValueType::Object));
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desc->_data.thread->addStatus(b);
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b->close();
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break;
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case WorkType::CUSTOM:
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b->add("type", VPackValue(desc->_customType));
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b->add("description", VPackValue(desc->_data.text));
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break;
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case WorkType::HANDLER:
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WorkMonitor::VPACK_HANDLER(b, desc);
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break;
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}
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if (desc->_prev != nullptr) {
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b->add("parent", VPackValue(VPackValueType::Object));
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vpackWorkDescription(b, desc->_prev);
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b->close();
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}
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief constructor
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////////////////////////////////////////////////////////////////////////////////
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WorkDescription::WorkDescription(WorkType type, WorkDescription* prev)
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: _type(type), _destroy(true), _prev(prev) {}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief constructor
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////////////////////////////////////////////////////////////////////////////////
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WorkMonitor::WorkMonitor() : Thread("Work Monitor"), _stopping(false) {}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief creates an empty WorkDescription
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////////////////////////////////////////////////////////////////////////////////
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WorkDescription* WorkMonitor::createWorkDescription(WorkType type) {
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WorkDescription* desc = nullptr;
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WorkDescription* prev = (CURRENT_THREAD == nullptr)
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? CURRENT_WORK_DESCRIPTION
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: CURRENT_THREAD->workDescription();
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if (EMPTY_WORK_DESCRIPTION.pop(desc) && desc != nullptr) {
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desc->_type = type;
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desc->_prev = prev;
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desc->_destroy = true;
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} else {
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desc = new WorkDescription(type, prev);
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}
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desc->_data.handler = nullptr;
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return desc;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief activates a WorkDescription
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////////////////////////////////////////////////////////////////////////////////
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void WorkMonitor::activateWorkDescription(WorkDescription* desc) {
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if (CURRENT_THREAD == nullptr) {
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CURRENT_WORK_DESCRIPTION = desc;
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} else {
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CURRENT_THREAD->setWorkDescription(desc);
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}
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief deactivates a WorkDescription
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////////////////////////////////////////////////////////////////////////////////
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WorkDescription* WorkMonitor::deactivateWorkDescription() {
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if (CURRENT_THREAD == nullptr) {
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WorkDescription* desc = CURRENT_WORK_DESCRIPTION;
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CURRENT_WORK_DESCRIPTION = desc->_prev;
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return desc;
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} else {
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return CURRENT_THREAD->setPrevWorkDescription();
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}
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief frees an WorkDescription
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////////////////////////////////////////////////////////////////////////////////
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void WorkMonitor::freeWorkDescription(WorkDescription* desc) {
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if (WORK_MONITOR_STOPPED) {
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deleteWorkDescription(desc, true);
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} else {
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FREEABLE_WORK_DESCRIPTION.push(desc);
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}
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief pushes a thread
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////////////////////////////////////////////////////////////////////////////////
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void WorkMonitor::pushThread(Thread* thread) {
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TRI_ASSERT(thread != nullptr);
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TRI_ASSERT(CURRENT_THREAD == nullptr);
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CURRENT_THREAD = thread;
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try {
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WorkDescription* desc = createWorkDescription(WorkType::THREAD);
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desc->_data.thread = thread;
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activateWorkDescription(desc);
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{
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MutexLocker guard(&THREADS_LOCK);
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THREADS.insert(thread);
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}
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} catch (...) {
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CURRENT_THREAD = nullptr;
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throw;
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}
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief pops a thread
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////////////////////////////////////////////////////////////////////////////////
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void WorkMonitor::popThread(Thread* thread) {
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TRI_ASSERT(thread != nullptr);
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WorkDescription* desc = deactivateWorkDescription();
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TRI_ASSERT(desc->_type == WorkType::THREAD);
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TRI_ASSERT(desc->_data.thread == thread);
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CURRENT_THREAD = nullptr;
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try {
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freeWorkDescription(desc);
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{
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MutexLocker guard(&THREADS_LOCK);
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THREADS.erase(thread);
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}
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} catch (...) {
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// just to prevent throwing exceptions from here, as this method
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// will be called in destructors...
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}
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief pushes a custom task
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////////////////////////////////////////////////////////////////////////////////
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void WorkMonitor::pushCustom(char const* type, char const* text,
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size_t length) {
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TRI_ASSERT(type != nullptr);
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TRI_ASSERT(text != nullptr);
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WorkDescription* desc = createWorkDescription(WorkType::CUSTOM);
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TRI_ASSERT(desc != nullptr);
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TRI_CopyString(desc->_customType, type, sizeof(desc->_customType) - 1);
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if (sizeof(desc->_data.text) - 1 < length) {
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length = sizeof(desc->_data.text) - 1;
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}
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TRI_CopyString(desc->_data.text, text, length);
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activateWorkDescription(desc);
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief pushes a custom task
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////////////////////////////////////////////////////////////////////////////////
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void WorkMonitor::pushCustom(char const* type, uint64_t id) {
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TRI_ASSERT(type != nullptr);
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WorkDescription* desc = createWorkDescription(WorkType::CUSTOM);
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TRI_ASSERT(desc != nullptr);
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TRI_CopyString(desc->_customType, type, sizeof(desc->_customType) - 1);
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std::string idString(std::to_string(id));
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TRI_CopyString(desc->_data.text, idString.c_str(), idString.size());
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activateWorkDescription(desc);
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief pops a custom task
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////////////////////////////////////////////////////////////////////////////////
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void WorkMonitor::popCustom() {
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WorkDescription* desc = deactivateWorkDescription();
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TRI_ASSERT(desc != nullptr);
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TRI_ASSERT(desc->_type == WorkType::CUSTOM);
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try {
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freeWorkDescription(desc);
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} catch (...) {
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// just to prevent throwing exceptions from here, as this method
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// will be called in destructors...
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}
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief requests a work overview
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////////////////////////////////////////////////////////////////////////////////
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void WorkMonitor::requestWorkOverview(uint64_t taskId) {
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WORK_OVERVIEW.push(taskId);
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}
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////////////////////////////////////////////////////////////////////////////////
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/// {@inheritDoc}
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////////////////////////////////////////////////////////////////////////////////
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void WorkMonitor::run() {
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const uint32_t maxSleep = 100 * 1000;
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const uint32_t minSleep = 100;
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uint32_t s = minSleep;
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// clean old entries and create summary if requested
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while (!_stopping) {
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try {
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bool found = false;
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WorkDescription* desc;
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while (FREEABLE_WORK_DESCRIPTION.pop(desc)) {
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found = true;
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if (desc != nullptr) {
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deleteWorkDescription(desc, false);
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}
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}
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if (found) {
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s = minSleep;
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} else if (s < maxSleep) {
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s *= 2;
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}
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uint64_t taskId;
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while (WORK_OVERVIEW.pop(taskId)) {
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VPackBuilder b;
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b.add(VPackValue(VPackValueType::Object));
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b.add("time", VPackValue(TRI_microtime()));
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b.add("work", VPackValue(VPackValueType::Array));
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{
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MutexLocker guard(&THREADS_LOCK);
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for (auto& thread : THREADS) {
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WorkDescription* desc = thread->workDescription();
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if (desc != nullptr) {
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b.add(VPackValue(VPackValueType::Object));
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vpackWorkDescription(&b, desc);
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b.close();
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}
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}
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}
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b.close();
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b.close();
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VPackSlice s(b.start());
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VPackOptions options;
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options.prettyPrint = true;
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std::string buffer;
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VPackStringSink sink(&buffer);
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VPackDumper dumper(&sink, &options);
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dumper.dump(s);
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SEND_WORK_OVERVIEW(taskId, buffer);
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}
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} catch (...) {
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// must prevent propagation of exceptions from here
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}
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usleep(s);
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}
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// indicate that we stopped the work monitor, freeWorkDescription
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// should directly delete old entries
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WORK_MONITOR_STOPPED = true;
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// cleanup old entries
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WorkDescription* desc;
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while (FREEABLE_WORK_DESCRIPTION.pop(desc)) {
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if (desc != nullptr) {
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deleteWorkDescription(desc, false);
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}
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}
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while (EMPTY_WORK_DESCRIPTION.pop(desc)) {
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if (desc != nullptr) {
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delete desc;
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}
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}
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief constructor
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////////////////////////////////////////////////////////////////////////////////
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CustomWorkStack::CustomWorkStack(char const* type, char const* text,
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size_t length) {
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WorkMonitor::pushCustom(type, text, length);
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief constructor
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////////////////////////////////////////////////////////////////////////////////
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CustomWorkStack::CustomWorkStack(char const* type, uint64_t id) {
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WorkMonitor::pushCustom(type, id);
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief destructor
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////////////////////////////////////////////////////////////////////////////////
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CustomWorkStack::~CustomWorkStack() { WorkMonitor::popCustom(); }
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////////////////////////////////////////////////////////////////////////////////
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/// @brief starts the work monitor
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////////////////////////////////////////////////////////////////////////////////
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void arangodb::InitializeWorkMonitor() {
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WORK_MONITOR_STOPPED.store(false);
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WORK_MONITOR.start();
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief stops the work monitor
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////////////////////////////////////////////////////////////////////////////////
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void arangodb::ShutdownWorkMonitor() {
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WORK_MONITOR.shutdown();
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WORK_MONITOR.join();
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}
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