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// dbcommands_admin.cpp
/**
* Copyright (C) 2012 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.
*/
/**
this file has dbcommands that are for dba type administration
mostly around dbs and collections
NOT system stuff
*/
#define MONGO_PCH_WHITELISTED
#include "mongo/platform/basic.h"
#include "mongo/pch.h"
#undef MONGO_PCH_WHITELISTED
#include <boost/filesystem/convenience.hpp>
#include <boost/filesystem/operations.hpp>
#include <string>
#include <vector>
#include "mongo/base/init.h"
#include "mongo/base/status.h"
#include "mongo/db/auth/action_set.h"
#include "mongo/db/auth/action_type.h"
#include "mongo/db/auth/privilege.h"
#include "mongo/db/commands.h"
#include "mongo/db/curop.h"
#include "mongo/db/index/index_access_method.h"
#include "mongo/db/index/index_descriptor.h"
#include "mongo/db/jsobj.h"
#include "mongo/db/query/internal_plans.h"
#include "mongo/db/storage_options.h"
#include "mongo/scripting/engine.h"
#include "mongo/util/alignedbuilder.h"
#include "mongo/util/background.h"
#include "mongo/util/logfile.h"
#include "mongo/util/paths.h"
#include "mongo/util/timer.h"
namespace mongo {
namespace dur {
boost::filesystem::path getJournalDir();
}
// Testing-only, enabled via command line
class JournalLatencyTestCmd : public Command {
public:
JournalLatencyTestCmd() : Command( "journalLatencyTest" ) {}
virtual bool slaveOk() const { return true; }
virtual bool isWriteCommandForConfigServer() const { return false; }
virtual bool adminOnly() const { return true; }
virtual void help(stringstream& h) const { h << "test how long to write and fsync to a test file in the journal/ directory"; }
// No auth needed because it only works when enabled via command line.
virtual void addRequiredPrivileges(const std::string& dbname,
const BSONObj& cmdObj,
std::vector<Privilege>* out) {}
bool run(OperationContext* txn, const string& dbname, BSONObj& cmdObj, int, string& errmsg, BSONObjBuilder& result, bool fromRepl ) {
boost::filesystem::path p = dur::getJournalDir();
p /= "journalLatencyTest";
// remove file if already present
try {
boost::filesystem::remove(p);
}
catch(...) { }
BSONObjBuilder bb[2];
for( int pass = 0; pass < 2; pass++ ) {
LogFile f(p.string());
AlignedBuilder b(1024 * 1024);
{
Timer t;
for( int i = 0 ; i < 100; i++ ) {
f.synchronousAppend(b.buf(), 8192);
}
bb[pass].append("8KB", t.millis() / 100.0);
}
{
const int N = 50;
Timer t2;
long long x = 0;
for( int i = 0 ; i < N; i++ ) {
Timer t;
f.synchronousAppend(b.buf(), 8192);
x += t.micros();
sleepmillis(4);
}
long long y = t2.micros() - 4*N*1000;
// not really trusting the timer granularity on all platforms so whichever is higher of x and y
bb[pass].append("8KBWithPauses", max(x,y) / (N*1000.0));
}
{
Timer t;
for( int i = 0 ; i < 20; i++ ) {
f.synchronousAppend(b.buf(), 1024 * 1024);
}
bb[pass].append("1MB", t.millis() / 20.0);
}
// second time around, we are prealloced.
}
result.append("timeMillis", bb[0].obj());
result.append("timeMillisWithPrealloc", bb[1].obj());
try {
remove(p);
}
catch(...) { }
try {
result.append("onSamePartition", onSamePartition(dur::getJournalDir().string(),
storageGlobalParams.dbpath));
}
catch(...) { }
return 1;
}
};
MONGO_INITIALIZER(RegisterJournalLatencyTestCmd)(InitializerContext* context) {
if (Command::testCommandsEnabled) {
// Leaked intentionally: a Command registers itself when constructed.
new JournalLatencyTestCmd();
}
return Status::OK();
}
}
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