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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 "pch.h"
#include "snapshots.h"
#include "../client.h"
#include "../clientcursor.h"
#include "../dbwebserver.h"
#include "../../util/mongoutils/html.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)
: _lock("Snapshots"), _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<div>";
for ( int i=0; i<numDeltas(); i++ ){
SnapshotDelta d( getPrev(i+1) , getPrev(i) );
unsigned e = (unsigned) d.elapsed() / 1000;
ss << (unsigned)(100*d.percentWriteLocked());
if( e < 3900 || e > 4100 )
ss << '(' << e / 1000.0 << "s)";
ss << ' ';
}
ss << "</div>\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;
}
}
prev = s;
}
catch ( std::exception& e ){
log() << "ERROR in SnapshotThread: " << e.what() << endl;
}
numLoops++;
sleepsecs(4);
}
client.shutdown();
}
using namespace mongoutils::html;
class WriteLockStatus : public WebStatusPlugin {
public:
WriteLockStatus() : WebStatusPlugin( "write lock" , 51 , "% time in write lock, by 4 sec periods" ){}
virtual void init(){}
virtual void run( stringstream& ss ){
statsSnapshots.outputLockInfoHTML( ss );
ss << "<a "
"href=\"http://www.mongodb.org/pages/viewpage.action?pageId=7209296\" "
"title=\"snapshot: was the db in the write lock when this page was generated?\">";
ss << "write locked now:</a> " << (dbMutex.info().isLocked() ? "true" : "false") << "\n";
}
} writeLockStatus;
class DBTopStatus : public WebStatusPlugin {
public:
DBTopStatus() : WebStatusPlugin( "dbtop" , 50 , "(occurences|percent of elapsed)" ){}
void display( stringstream& ss , double elapsed , const Top::UsageData& usage ){
ss << "<td>";
ss << usage.count;
ss << "</td><td>";
double per = 100 * ((double)usage.time)/elapsed;
ss << setprecision(1) << fixed << per << "%";
ss << "</td>";
}
void display( stringstream& ss , double elapsed , const string& ns , const Top::CollectionData& data ){
if ( ns != "GLOBAL" && data.total.count == 0 )
return;
ss << "<tr><th>" << ns << "</th>";
display( ss , elapsed , data.total );
display( ss , elapsed , data.readLock );
display( ss , elapsed , data.writeLock );
display( ss , elapsed , data.queries );
display( ss , elapsed , data.getmore );
display( ss , elapsed , data.insert );
display( ss , elapsed , data.update );
display( ss , elapsed , data.remove );
ss << "</tr>\n";
}
void run( stringstream& ss ){
auto_ptr<SnapshotDelta> delta = statsSnapshots.computeDelta();
if ( ! delta.get() )
return;
ss << "<table border=1 cellpadding=2 cellspacing=0>";
ss << "<tr align='left'><th>";
ss << a("http://www.mongodb.org/display/DOCS/Developer+FAQ#DeveloperFAQ-What%27sa%22namespace%22%3F", "namespace") <<
"NS</a></th>"
"<th colspan=2>total</th>"
"<th colspan=2>Reads</th>"
"<th colspan=2>Writes</th>"
"<th colspan=2>Queries</th>"
"<th colspan=2>GetMores</th>"
"<th colspan=2>Inserts</th>"
"<th colspan=2>Updates</th>"
"<th colspan=2>Removes</th>";
ss << "</tr>\n";
display( ss , (double) delta->elapsed() , "GLOBAL" , delta->globalUsageDiff() );
Top::UsageMap usage = delta->collectionUsageDiff();
for ( Top::UsageMap::iterator i=usage.begin(); i != usage.end(); i++ ){
display( ss , (double) delta->elapsed() , i->first , i->second );
}
ss << "</table>";
}
virtual void init(){}
} dbtopStatus;
Snapshots statsSnapshots;
SnapshotThread snapshotThread;
}
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