memInfo.H

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/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | Copyright (C) 2011 OpenFOAM Foundation
     \\/     M anipulation  |
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.
 
    OpenFOAM is free software: you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
 
    OpenFOAM 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 General Public License
    for more details.
 
    You should have received a copy of the GNU General Public License
    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
Class
    Foam::memInfo
 
Description
    Memory usage information for the process running this object.
 
Note
    Uses the information from /proc/<pid>/status
 
SourceFiles
    memInfo.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef memInfo_H
#define memInfo_H
 
#include "OSspecific.H"
#include "POSIX.H"
#include "IFstream.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
/*---------------------------------------------------------------------------*\
                           Class memInfo Declaration
\*---------------------------------------------------------------------------*/
 
class memInfo
{
    // Private data
 
        //- Peak memory used by the process (VmPeak in /proc/<pid>/status)
        int peak_;
 
        //- Memory used by the process (VmSize in /proc/<pid>/status)
        int size_;
 
        //- Resident set size of the process (VmRSS in /proc/<pid>/status)
        int rss_;
 
 
public:
 
    // Constructors
 
        //- Construct null
        memInfo();
 
 
    //- Destructor
    ~memInfo();
 
 
    // Member Functions
 
        //- Parse /proc/<pid>/status
        const memInfo& update();
 
        // Access
 
            //- Access the stored peak memory (VmPeak in /proc/<pid>/status)
            //  The value is stored from the previous update()
            int peak() const
            {
                return peak_;
            }
 
            //- Access the stored memory size (VmSize in /proc/<pid>/status)
            //  The value is stored from the previous update()
            int size() const
            {
                return size_;
            }
 
            //- Access the stored rss value (VmRSS in /proc/<pid>/status)
            //  The value is stored from the previous update()
            int rss() const
            {
                return rss_;
            }
 
            //- True if the memory information appears valid
            bool valid() const;
 
 
    // IOstream Operators
 
        //- Read peak/size/rss from stream
        friend Istream& operator>>(Istream&, memInfo&);
 
        //- Write peak/size/rss to stream
        friend Ostream& operator<<(Ostream&, const memInfo&);
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //