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// snapshots.h
/**
* Copyright (C) 2008 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include "../../pch.h"
#include "../jsobj.h"
#include "top.h"
#include "../../util/background.h"
/**
handles snapshotting performance metrics and other such things
*/
namespace mongo {
class SnapshotThread;
/**
* stores a point in time snapshot
* i.e. all counters at a given time
*/
class SnapshotData {
void takeSnapshot();
unsigned long long _created;
Top::CollectionData _globalUsage;
unsigned long long _totalWriteLockedTime; // micros of total time locked
Top::UsageMap _usage;
friend class SnapshotThread;
friend class SnapshotDelta;
friend class Snapshots;
};
/**
* contains performance information for a time period
*/
class SnapshotDelta {
public:
SnapshotDelta( const SnapshotData& older , const SnapshotData& newer );
unsigned long long start() const {
return _older._created;
}
unsigned long long elapsed() const {
return _elapsed;
}
unsigned long long timeInWriteLock() const {
return _newer._totalWriteLockedTime - _older._totalWriteLockedTime;
}
double percentWriteLocked() const {
double e = (double) elapsed();
double w = (double) timeInWriteLock();
return w/e;
}
Top::CollectionData globalUsageDiff();
Top::UsageMap collectionUsageDiff();
private:
const SnapshotData& _older;
const SnapshotData& _newer;
unsigned long long _elapsed;
};
class Snapshots {
public:
Snapshots(int n=100);
const SnapshotData* takeSnapshot();
int numDeltas() const { return _stored-1; }
const SnapshotData& getPrev( int numBack = 0 );
auto_ptr<SnapshotDelta> computeDelta( int numBack = 0 );
void outputLockInfoHTML( stringstream& ss );
private:
mongo::mutex _lock;
int _n;
boost::scoped_array<SnapshotData> _snapshots;
int _loc;
int _stored;
};
class SnapshotThread : public BackgroundJob {
public:
virtual string name() const { return "snapshot"; }
void run();
};
extern Snapshots statsSnapshots;
extern SnapshotThread snapshotThread;
}
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