memInfo.H
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1 /*---------------------------------------------------------------------------*\
2  ========= |
3  \\ / F ield | OpenFOAM: The Open Source CFD Toolbox
4  \\ / O peration |
5  \\ / A nd | Copyright (C) 2011 OpenFOAM Foundation
6  \\/ M anipulation |
7 -------------------------------------------------------------------------------
8 License
9  This file is part of OpenFOAM.
10 
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18  FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
19  for more details.
20 
21  You should have received a copy of the GNU General Public License
22  along with OpenFOAM. If not, see <http://www.gnu.org/licenses/>.
23 
24 Class
25  Foam::memInfo
26 
27 Description
28  Memory usage information for the process running this object.
29 
30 Note
31  Uses the information from /proc/<pid>/status
32 
33 SourceFiles
34  memInfo.C
35 
36 \*---------------------------------------------------------------------------*/
37 
38 #ifndef memInfo_H
39 #define memInfo_H
40 
41 #include "OSspecific.H"
42 #include "POSIX.H"
43 #include "IFstream.H"
44 
45 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
46 
47 namespace Foam
48 {
49 
50 /*---------------------------------------------------------------------------*\
51  Class memInfo Declaration
52 \*---------------------------------------------------------------------------*/
53 
54 class memInfo
55 {
56  // Private data
57 
58  //- Peak memory used by the process (VmPeak in /proc/<pid>/status)
59  int peak_;
60 
61  //- Memory used by the process (VmSize in /proc/<pid>/status)
62  int size_;
63 
64  //- Resident set size of the process (VmRSS in /proc/<pid>/status)
65  int rss_;
66 
67 
68 public:
69 
70  // Constructors
71 
72  //- Construct null
73  memInfo();
74 
75 
76  //- Destructor
77  ~memInfo();
78 
79 
80  // Member Functions
81 
82  //- Parse /proc/<pid>/status
83  const memInfo& update();
84 
85  // Access
86 
87  //- Access the stored peak memory (VmPeak in /proc/<pid>/status)
88  // The value is stored from the previous update()
89  int peak() const
90  {
91  return peak_;
92  }
93 
94  //- Access the stored memory size (VmSize in /proc/<pid>/status)
95  // The value is stored from the previous update()
96  int size() const
97  {
98  return size_;
99  }
100 
101  //- Access the stored rss value (VmRSS in /proc/<pid>/status)
102  // The value is stored from the previous update()
103  int rss() const
104  {
105  return rss_;
106  }
107 
108  //- True if the memory information appears valid
109  bool valid() const;
110 
111 
112  // IOstream Operators
113 
114  //- Read peak/size/rss from stream
115  friend Istream& operator>>(Istream&, memInfo&);
116 
117  //- Write peak/size/rss to stream
118  friend Ostream& operator<<(Ostream&, const memInfo&);
119 };
120 
121 
122 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
123 
124 } // End namespace Foam
125 
126 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
127 
128 #endif
129 
130 // ************************************************************************* //