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// cpuload.cpp
/**
* Copyright (C) 2017 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/platform/basic.h"
#include "mongo/base/init.h"
#include "mongo/db/commands.h"
namespace mongo {
using std::string;
using std::stringstream;
// Testing-only, enabled via command line.
class CPULoadCommand : public Command {
public:
CPULoadCommand() : Command("cpuload") {}
virtual bool slaveOk() const {
return true;
}
virtual bool isWriteCommandForConfigServer() const {
return false;
}
virtual void help(stringstream& help) const {
help << "internal. for testing only.";
help << "{ cpuload : 1, cpuFactor : 1 } Runs a straight CPU load. Length of execution ";
help << "scaled by cpuFactor. Puts no additional load on the server beyond the cpu use.";
help << "Useful for testing the stability of the performance of the underlying system,";
help << "by running the command repeatedly and observing the variation in execution time.";
}
virtual void addRequiredPrivileges(const std::string& dbname,
const BSONObj& cmdObj,
std::vector<Privilege>* out) {} // No auth required
virtual bool run(OperationContext* txn,
const string& badns,
const BSONObj& cmdObj,
string& errmsg,
BSONObjBuilder& result) {
double cpuFactor = 1;
if (cmdObj["cpuFactor"].isNumber()) {
cpuFactor = cmdObj["cpuFactor"].number();
}
long long limit = 10000 * cpuFactor;
// volatile used to ensure that loop is not optimized away
volatile uint64_t lresult = 0; // NOLINT
uint64_t x = 100;
for (long long i = 0; i < limit; i++) {
x *= 13;
}
lresult = x;
return true;
}
virtual bool supportsWriteConcern(const BSONObj& cmd) const {
return false;
}
};
MONGO_INITIALIZER(RegisterCpuLoadCmd)(InitializerContext* context) {
if (Command::testCommandsEnabled) {
new CPULoadCommand();
}
return Status::OK();
}
} // namespace mongo
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