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/usr/include/mongo/util/systeminfo.h is in mongodb-dev 1:2.4.9-1ubuntu2.

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/**
 * Copyright 2011 (c) 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/>.
 */

#pragma once

#include <cstddef>

namespace mongo {

    class SystemInfo {
    public:
        /*
          Get the amount of physical memory available on the host.

          This should only be used for "advisory" purposes, and not as a hard
          value, because this could be deceptive on virtual hosts, and because
          this will return zero on platforms that do not support it.

          @returns amount of physical memory, or zero
         */
        static size_t getPhysicalRam();

    private:
        // don't instantiate this class
        SystemInfo(); // no implementation
    };

}