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// btree_stats.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/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/pch.h"
#include "mongo/base/init.h"
#include "mongo/db/btree_stats.h"
namespace mongo {
IndexCounters::IndexCounters()
: ServerStatusSection( "indexCounters" ) {
_memSupported = ProcessInfo().blockCheckSupported();
_btreeMemHits = 0;
_btreeMemMisses = 0;
_btreeAccesses = 0;
_maxAllowed = ( numeric_limits< long long >::max() ) / 2;
_resets = 0;
}
IndexCounters::~IndexCounters(){
}
BSONObj IndexCounters::generateSection(const BSONElement& configElement) const {
if ( ! _memSupported ) {
return BSON( "note" << "not supported on this platform" );
}
BSONObjBuilder bb;
bb.appendNumber( "accesses" , _btreeAccesses );
bb.appendNumber( "hits" , _btreeMemHits );
bb.appendNumber( "misses" , _btreeMemMisses );
bb.append( "resets" , _resets );
bb.append( "missRatio" , (_btreeAccesses ? (_btreeMemMisses / (double)_btreeAccesses) : 0) );
return bb.obj();
}
void IndexCounters::_roll() {
_btreeAccesses = 0;
_btreeMemMisses = 0;
_btreeMemHits = 0;
_resets++;
}
IndexCounters* globalIndexCounters = NULL;
MONGO_INITIALIZER_WITH_PREREQUISITES(BtreeIndexCountersBlockSupported,
("SystemInfo"))(InitializerContext* cx) {
if (globalIndexCounters == NULL) {
globalIndexCounters = new IndexCounters();
}
return Status::OK();
}
}
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