Geant4  10.03.p03
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G4MemStat.cc
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26 /*
27  * MemStat.cc
28  *
29  * Created on: 4 févr. 2014
30  * Author: kara
31  */
32 
33 #include "G4MemStat.hh"
34 
35 #if ( defined(__MACH__) && defined(__clang__) && defined(__x86_64__) ) || \
36  ( defined(__MACH__) && defined(__GNUC__) && __GNUC__>=4 && __GNUC_MINOR__>=7 ) || \
37  defined(__linux__) || defined(_AIX)
38 
39 #include <unistd.h>
40 
41 #endif
42 
43 #include <ios>
44 #include <iostream>
45 #include <fstream>
46 #include <string>
47 
48 namespace G4MemStat
49 {
50 
51  using std::ios_base;
52  using std::ifstream;
53  using std::string;
54 
56  {
57  MemStat output;
58 
59 #if ( defined(__MACH__) && defined(__clang__) && defined(__x86_64__) ) || \
60  ( defined(__MACH__) && defined(__GNUC__) && __GNUC__>=4 && __GNUC_MINOR__>=7 ) || \
61  defined(__linux__) || defined(_AIX)
62 
63  // 'file' stat seems to give the most reliable results
64  //
65  ifstream stat_stream("/proc/self/stat", ios_base::in);
66 
67  // dummy vars for leading entries in stat that we don't care about
68  //
69  string pid, comm, state, ppid, pgrp, session, tty_nr;
70  string tpgid, flags, minflt, cminflt, majflt, cmajflt;
71  string utime, stime, cutime, cstime, priority, nice;
72  string O, itrealvalue, starttime;
73 
74  // the two fields we want
75  //
76  unsigned long vsize;
77  long rss;
78 
79  stat_stream >> pid >> comm >> state >> ppid >> pgrp >> session >> tty_nr
80  >> tpgid >> flags >> minflt >> cminflt >> majflt >> cmajflt >> utime
81  >> stime >> cutime >> cstime >> priority >> nice >> O >> itrealvalue
82  >> starttime >> vsize >> rss; // don't care about the rest
83 
84  stat_stream.close();
85 
86  long page_size_kb = sysconf(_SC_PAGE_SIZE) / 1024; // in case x86-64 is configured to use 2MB pages
87  output.vmz = vsize / 1024.0;
88  output.mem = rss * page_size_kb;
89 #endif
90 
91  return output;
92  }
93 
94  std::ostream & operator<<(std::ostream &os, const MemStat& memStat)
95  {
96  return os << "( vmz: " << memStat.vmz << ", " << "mem: " << memStat.mem
97  << ")";
98  }
99 
100 }
MemStat MemoryUsage()
Definition: G4MemStat.cc:55
static G4UIterminal * session
std::ostream & operator<<(std::ostream &os, const MemStat &p)
Definition: G4MemStat.cc:94