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// top.h : DB usage monitor.
/* Copyright 2009 10gen Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <boost/date_time/posix_time/posix_time.hpp>
#undef assert
#define assert MONGO_assert
namespace mongo {
/**
* tracks usage by collection
*/
class Top {
public:
Top() : _lock("Top") { }
class UsageData {
public:
UsageData() : time(0) , count(0){}
UsageData( const UsageData& older , const UsageData& newer );
long long time;
long long count;
void inc( long long micros ){
count++;
time += micros;
}
};
class CollectionData {
public:
/**
* constructs a diff
*/
CollectionData(){}
CollectionData( const CollectionData& older , const CollectionData& newer );
UsageData total;
UsageData readLock;
UsageData writeLock;
UsageData queries;
UsageData getmore;
UsageData insert;
UsageData update;
UsageData remove;
UsageData commands;
};
typedef map<string,CollectionData> UsageMap;
public:
void record( const string& ns , int op , int lockType , long long micros , bool command );
void append( BSONObjBuilder& b );
void cloneMap(UsageMap& out);
CollectionData getGlobalData(){ return _global; }
void collectionDropped( const string& ns );
public: // static stuff
static Top global;
void append( BSONObjBuilder& b , const char * name , const UsageData& map );
void append( BSONObjBuilder& b , const UsageMap& map );
private:
void _record( CollectionData& c , int op , int lockType , long long micros , bool command );
mongo::mutex _lock;
CollectionData _global;
UsageMap _usage;
string _lastDropped;
};
/* Records per namespace utilization of the mongod process.
No two functions of this class may be called concurrently.
*/
class TopOld {
typedef boost::posix_time::ptime T;
typedef boost::posix_time::time_duration D;
typedef boost::tuple< D, int, int, int > UsageData;
public:
TopOld() : _read(false), _write(false) { }
/* these are used to record activity: */
void clientStart( const char *client ) {
clientStop();
_currentStart = currentTime();
_current = client;
}
/* indicate current request is a read operation. */
void setRead() { _read = true; }
void setWrite() { _write = true; }
void clientStop() {
if ( _currentStart == T() )
return;
D d = currentTime() - _currentStart;
{
scoped_lock L(topMutex);
recordUsage( _current, d );
}
_currentStart = T();
_read = false;
_write = false;
}
/* these are used to fetch the stats: */
struct Usage {
string ns;
D time;
double pct;
int reads, writes, calls;
};
static void usage( vector< Usage > &res ) {
scoped_lock L(topMutex);
// Populate parent namespaces
UsageMap snapshot;
UsageMap totalUsage;
fillParentNamespaces( snapshot, _snapshot );
fillParentNamespaces( totalUsage, _totalUsage );
multimap< D, string, more > sorted;
for( UsageMap::iterator i = snapshot.begin(); i != snapshot.end(); ++i )
sorted.insert( make_pair( i->second.get<0>(), i->first ) );
for( multimap< D, string, more >::iterator i = sorted.begin(); i != sorted.end(); ++i ) {
if ( trivialNs( i->second.c_str() ) )
continue;
Usage u;
u.ns = i->second;
u.time = totalUsage[ u.ns ].get<0>();
u.pct = _snapshotDuration != D() ? 100.0 * i->first.ticks() / _snapshotDuration.ticks() : 0;
u.reads = snapshot[ u.ns ].get<1>();
u.writes = snapshot[ u.ns ].get<2>();
u.calls = snapshot[ u.ns ].get<3>();
res.push_back( u );
}
for( UsageMap::iterator i = totalUsage.begin(); i != totalUsage.end(); ++i ) {
if ( snapshot.count( i->first ) != 0 || trivialNs( i->first.c_str() ) )
continue;
Usage u;
u.ns = i->first;
u.time = i->second.get<0>();
u.pct = 0;
u.reads = 0;
u.writes = 0;
u.calls = 0;
res.push_back( u );
}
}
static void completeSnapshot() {
scoped_lock L(topMutex);
if ( &_snapshot == &_snapshotA ) {
_snapshot = _snapshotB;
_nextSnapshot = _snapshotA;
} else {
_snapshot = _snapshotA;
_nextSnapshot = _snapshotB;
}
_snapshotDuration = currentTime() - _snapshotStart;
_snapshotStart = currentTime();
_nextSnapshot.clear();
}
private:
static mongo::mutex topMutex;
static bool trivialNs( const char *ns ) {
const char *ret = strrchr( ns, '.' );
return ret && ret[ 1 ] == '\0';
}
typedef map<string,UsageData> UsageMap; // duration, # reads, # writes, # total calls
static T currentTime() {
return boost::posix_time::microsec_clock::universal_time();
}
void recordUsage( const string &client, D duration ) {
recordUsageForMap( _totalUsage, client, duration );
recordUsageForMap( _nextSnapshot, client, duration );
}
void recordUsageForMap( UsageMap &map, const string &client, D duration ) {
UsageData& g = map[client];
g.get< 0 >() += duration;
if ( _read && !_write )
g.get< 1 >()++;
else if ( !_read && _write )
g.get< 2 >()++;
g.get< 3 >()++;
}
static void fillParentNamespaces( UsageMap &to, const UsageMap &from ) {
for( UsageMap::const_iterator i = from.begin(); i != from.end(); ++i ) {
string current = i->first;
size_t dot = current.rfind( "." );
if ( dot == string::npos || dot != current.length() - 1 ) {
inc( to[ current ], i->second );
}
while( dot != string::npos ) {
current = current.substr( 0, dot );
inc( to[ current ], i->second );
dot = current.rfind( "." );
}
}
}
static void inc( UsageData &to, const UsageData &from ) {
to.get<0>() += from.get<0>();
to.get<1>() += from.get<1>();
to.get<2>() += from.get<2>();
to.get<3>() += from.get<3>();
}
struct more { bool operator()( const D &a, const D &b ) { return a > b; } };
string _current;
T _currentStart;
static T _snapshotStart;
static D _snapshotDuration;
static UsageMap _totalUsage;
static UsageMap _snapshotA;
static UsageMap _snapshotB;
static UsageMap &_snapshot;
static UsageMap &_nextSnapshot;
bool _read;
bool _write;
};
} // namespace mongo
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