ProcStats Class Reference

#include <src/ProcStats.h>

Collaboration diagram for ProcStats:

Classes
struct	cleanup
class	unique_fd

Public Member Functions
bool	fetch (procInfo &fill_me)
double	pageSize () const

Static Public Member Functions
static ProcStats *	instance ()

Private Member Functions
	ProcStats ()

Private Attributes
unique_fd	fd
double	pg_size
procInfo	curr
std::string	fname
char	buf [500]
bool	valid

Static Private Attributes
static ProcStats *	inst = 0

Friends
struct	cleanup

Detailed Description

Definition at line 42 of file ProcStats.h.

Constructor & Destructor Documentation

ProcStats::ProcStats ( )

private

Definition at line 249 of file ProcStats.cpp.

                     : valid( false )
{
#if defined( __linux__ ) or defined( __APPLE__ )
  pg_size = sysconf( _SC_PAGESIZE ); // getpagesize();

  fname = "/proc/" + std::to_string( getpid() ) + "/stat";

  fd.open( fname.c_str(), O_RDONLY );
  if ( !fd ) {
    cerr << "Failed to open " << fname << endl;
    return;
  }
#endif // __linux__ or __APPLE__
  valid = true;
}

Member Function Documentation

bool ProcStats::fetch

(

procInfo &

fill_me

)

Definition at line 265 of file ProcStats.cpp.

{
  if ( valid == false ) return false;

#if defined( __linux__ ) or defined( __APPLE__ )
  double     pr_size, pr_rssize;
  linux_proc pinfo;
  int        cnt;

  fd.lseek( 0, SEEK_SET );

  if ( ( cnt = fd.read( buf, sizeof( buf ) ) ) < 0 ) {
    cout << "LINUX Read of Proc file failed:" << endl;
    return false;
  }

  if ( cnt > 0 ) {
    buf[std::min( static_cast<std::size_t>( cnt ), sizeof( buf ) - 1 )] = '\0';

    sscanf( buf,
            // 1  2  3  4  5  6  7  8  9  10  1   2   3   4   5   6   7   8   9   20  1   2   3   4   5   6   7   8   9
            // 30  1   2   3   4   5
            "%d %s %c %d %d %d %d %d %lu %lu %lu %lu %lu %lu %lu %ld %ld %ld %ld %ld %ld %llu %lu %ld %lu %lu %lu %lu "
            "%lu %lu %lu %lu %lu %lu %lu",
            &pinfo.pid, pinfo.comm, &pinfo.state, &pinfo.ppid, &pinfo.pgrp, &pinfo.session, &pinfo.tty, &pinfo.tpgid,
            &pinfo.flags, &pinfo.minflt, &pinfo.cminflt, &pinfo.majflt, &pinfo.cmajflt, &pinfo.utime, &pinfo.stime,
            &pinfo.cutime, &pinfo.cstime, &pinfo.priority, &pinfo.nice, &pinfo.num_threads, &pinfo.itrealvalue,
            &pinfo.starttime, &pinfo.vsize, &pinfo.rss, &pinfo.rlim, &pinfo.startcode, &pinfo.endcode,
            &pinfo.startstack, &pinfo.kstkesp, &pinfo.kstkeip, &pinfo.signal, &pinfo.blocked, &pinfo.sigignore,
            &pinfo.sigcatch, &pinfo.wchan );

    // resident set size in pages
    pr_size   = (double)pinfo.vsize;
    pr_rssize = (double)pinfo.rss;

    f.vsize = pr_size / ( 1024 * 1024 );
    f.rss   = pr_rssize * pg_size / ( 1024 * 1024 );
  }

#else
  f.vsize = 0;
  f.rss   = 0;
#endif // __linux__ or __APPLE__

  bool rc = ( curr == f ) ? false : true;

  curr.rss   = f.rss;
  curr.vsize = f.vsize;

  return rc;
}

ProcStats * ProcStats::instance ( )

static

Definition at line 240 of file ProcStats.cpp.

{
  static cleanup c;
  if ( !inst ) inst = new ProcStats;
  return inst;
}

double ProcStats::pageSize ( ) const

inline

Definition at line 48 of file ProcStats.h.

{ return pg_size; }

Friends And Related Function Documentation

friend struct cleanup

friend

Definition at line 58 of file ProcStats.h.

Member Data Documentation

char ProcStats::buf[500]

private

Definition at line 106 of file ProcStats.h.

procInfo ProcStats::curr

private

Definition at line 104 of file ProcStats.h.

unique_fd ProcStats::fd

private

Definition at line 102 of file ProcStats.h.

std::string ProcStats::fname

private

Definition at line 105 of file ProcStats.h.

ProcStats * ProcStats::inst = 0

staticprivate

Definition at line 109 of file ProcStats.h.

double ProcStats::pg_size

private

Definition at line 103 of file ProcStats.h.

bool ProcStats::valid

private

Definition at line 107 of file ProcStats.h.

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The documentation for this class was generated from the following files:

• GaudiAud/src/ProcStats.h
• GaudiAud/src/ProcStats.cpp