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// snapshots.cpp
/**
* 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/>.
*/
#include "stdafx.h"
#include "snapshots.h"
#include "../client.h"
#include "../clientcursor.h"
/**
handles snapshotting performance metrics and other such things
*/
namespace mongo {
void SnapshotData::takeSnapshot(){
_created = curTimeMicros64();
_globalUsage = Top::global.getGlobalData();
_totalWriteLockedTime = dbMutex.info().getTimeLocked();
Top::global.cloneMap(_usage);
}
SnapshotDelta::SnapshotDelta( const SnapshotData& older , const SnapshotData& newer )
: _older( older ) , _newer( newer )
{
assert( _newer._created > _older._created );
_elapsed = _newer._created - _older._created;
}
Top::CollectionData SnapshotDelta::globalUsageDiff(){
return Top::CollectionData( _older._globalUsage , _newer._globalUsage );
}
Top::UsageMap SnapshotDelta::collectionUsageDiff(){
Top::UsageMap u;
for ( Top::UsageMap::const_iterator i=_newer._usage.begin(); i != _newer._usage.end(); i++ ){
Top::UsageMap::const_iterator j = _older._usage.find(i->first);
if (j != _older._usage.end())
u[i->first] = Top::CollectionData( j->second , i->second );
}
return u;
}
Snapshots::Snapshots(int n)
: _n(n)
, _snapshots(new SnapshotData[n])
, _loc(0)
, _stored(0)
{}
const SnapshotData* Snapshots::takeSnapshot(){
scoped_lock lk(_lock);
_loc = ( _loc + 1 ) % _n;
_snapshots[_loc].takeSnapshot();
if ( _stored < _n )
_stored++;
return &_snapshots[_loc];
}
auto_ptr<SnapshotDelta> Snapshots::computeDelta( int numBack ){
scoped_lock lk(_lock);
auto_ptr<SnapshotDelta> p;
if ( numBack < numDeltas() )
p.reset( new SnapshotDelta( getPrev(numBack+1) , getPrev(numBack) ) );
return p;
}
const SnapshotData& Snapshots::getPrev( int numBack ){
int x = _loc - numBack;
if ( x < 0 )
x += _n;
return _snapshots[x];
}
void Snapshots::outputLockInfoHTML( stringstream& ss ){
scoped_lock lk(_lock);
ss << "\n<table>";
ss << "<tr><th>elapsed(ms)</th><th>% write locked</th></tr>\n";
for ( int i=0; i<numDeltas(); i++ ){
SnapshotDelta d( getPrev(i+1) , getPrev(i) );
ss << "<tr>"
<< "<td>" << ( d.elapsed() / 1000 ) << "</td>"
<< "<td>" << (unsigned)(100*d.percentWriteLocked()) << "%</td>"
<< "</tr>"
;
}
ss << "</table>\n";
}
void SnapshotThread::run(){
Client::initThread("snapshotthread");
Client& client = cc();
long long numLoops = 0;
const SnapshotData* prev = 0;
while ( ! inShutdown() ){
try {
const SnapshotData* s = statsSnapshots.takeSnapshot();
if ( prev ){
unsigned long long elapsed = s->_created - prev->_created;
if ( cmdLine.cpu ){
SnapshotDelta d( *prev , *s );
log() << "cpu: elapsed:" << (elapsed/1000) <<" writelock: " << (int)(100*d.percentWriteLocked()) << "%" << endl;
}
// TODO: this should really be somewhere else, like in a special ClientCursor thread
ClientCursor::idleTimeReport( (unsigned)(elapsed/1000) );
}
prev = s;
}
catch ( std::exception& e ){
log() << "ERROR in SnapshotThread: " << e.what() << endl;
}
numLoops++;
sleepsecs(4);
}
client.shutdown();
}
Snapshots statsSnapshots;
SnapshotThread snapshotThread;
}
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