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115 lines
3.0 KiB
C++
115 lines
3.0 KiB
C++
// snapshots.h
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/**
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* Copyright (C) 2008 10gen Inc.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License, version 3,
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* as published by the Free Software Foundation.
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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 Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include "../../pch.h"
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#include "../jsobj.h"
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#include "top.h"
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#include "../../util/background.h"
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/**
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handles snapshotting performance metrics and other such things
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*/
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namespace mongo {
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class SnapshotThread;
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/**
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* stores a point in time snapshot
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* i.e. all counters at a given time
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*/
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class SnapshotData {
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void takeSnapshot();
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unsigned long long _created;
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Top::CollectionData _globalUsage;
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unsigned long long _totalWriteLockedTime; // micros of total time locked
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Top::UsageMap _usage;
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friend class SnapshotThread;
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friend class SnapshotDelta;
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friend class Snapshots;
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};
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/**
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* contains performance information for a time period
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*/
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class SnapshotDelta {
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public:
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SnapshotDelta( const SnapshotData& older , const SnapshotData& newer );
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unsigned long long start() const {
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return _older._created;
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}
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unsigned long long elapsed() const {
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return _elapsed;
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}
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unsigned long long timeInWriteLock() const {
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return _newer._totalWriteLockedTime - _older._totalWriteLockedTime;
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}
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double percentWriteLocked() const {
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double e = (double) elapsed();
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double w = (double) timeInWriteLock();
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return w/e;
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}
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Top::CollectionData globalUsageDiff();
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Top::UsageMap collectionUsageDiff();
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private:
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const SnapshotData& _older;
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const SnapshotData& _newer;
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unsigned long long _elapsed;
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};
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class Snapshots {
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public:
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Snapshots(int n=100);
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const SnapshotData* takeSnapshot();
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int numDeltas() const { return _stored-1; }
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const SnapshotData& getPrev( int numBack = 0 );
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auto_ptr<SnapshotDelta> computeDelta( int numBack = 0 );
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void outputLockInfoHTML( stringstream& ss );
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private:
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mongo::mutex _lock;
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int _n;
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boost::scoped_array<SnapshotData> _snapshots;
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int _loc;
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int _stored;
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};
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class SnapshotThread : public BackgroundJob {
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public:
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string name() { return "snapshot"; }
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void run();
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};
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extern Snapshots statsSnapshots;
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extern SnapshotThread snapshotThread;
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}
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