mirror of
https://github.com/mongodb/mongo.git
synced 2024-12-01 09:32:32 +01:00
115 lines
2.9 KiB
C++
115 lines
2.9 KiB
C++
// 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:
|
|
string name() const { return "snapshot"; }
|
|
void run();
|
|
};
|
|
|
|
extern Snapshots statsSnapshots;
|
|
extern SnapshotThread snapshotThread;
|
|
|
|
|
|
}
|