ProcStats.h

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* (c) Copyright 1998-2026 CERN for the benefit of the LHCb and ATLAS collaborations *
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* This software is distributed under the terms of the Apache version 2 licence,     *
* copied verbatim in the file "LICENSE".                                            *
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#pragma once
 
// Class: ProcStats
// Description:  Reports the memory usage (virtual size and RSS) of the current process
// Author: Jim Kowalkowski (FNAL), modified by M. Shapiro (LBNL)
 
#if defined( __linux__ )
#  include <unistd.h>
#endif
 
struct procInfo {
  double vsize{ 0 }; // virtual memory size, in MB
  double rss{ 0 };   // resident set size, in MB
};
 
class ProcStats {
 
public:
  static ProcStats* instance();
  bool fetch( procInfo& fill_me );
 
private:
  ProcStats() = default;
 
#if defined( __linux__ )
  long m_pageSize{ sysconf( _SC_PAGESIZE ) };
#endif
};