#ifndef ALIMEMORYWATCHER_H
#define ALIMEMORYWATCHER_H
/* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
 * See cxx source for full Copyright notice     */

/* $Id$ */

//_________________________________________________________________________
//Basic Memory Leak utility.
//  
//  You can use this tiny class to *see* if your program is leaking.
//  Usage:
//  AliMemoryWatcher memwatcher;
//  some program loop on events here {
//    if ( nevents % x == 0 ) 
//    {
//    // take a sample every x events
//      memwatcher.watch(nevents);
//    }
//  }
//  TFile f("out.root","RECREATE");
//  memwatcher.write();
//  f.Close();
//  In the output root file you'll get 3 graphs representing
//  the evolAliPHOSon, as a function of the number of events, of :
//  - VSIZE is the virtual size (in KBytes) of your program, that is sort of
//  the total memory used
//  - RSSIZE is the resident size (in KBytes), that is, the part of your 
//  program which is really in physical memory.
//  - TIME is an estimate of time per event (really it's the time elasped
//  between two calls to watch method)
//  WARNING: this is far from a bulletproof memory report (it's basically 
//  using UNIX command ps -h -p [PID] -o vsize,rssize to do its job).
//  It has only been tested on Linux so far.
//  
//  But by fitting the VSIZE by a pol1 under ROOT, you'll see right away
//  by how much your program is leaking.
//
//*-- Author: Laurent Aphecetche(SUBATECH)

// --- ROOT system ---

#include "TObject.h" 
class TH2;
class TGraph;
class TStopwatch;
class AliMemoryWatcher : public TObject 
{
public:
  AliMemoryWatcher(UInt_t maxsize=10000);
  AliMemoryWatcher(const AliMemoryWatcher& mw);
  ~AliMemoryWatcher() ;
  void Watch(Int_t x);
  
  UInt_t Size(void) const { return fSize; }
  Int_t X(Int_t n) const { return fX[n]; }
  Int_t VSIZE(Int_t n) const { return fVSIZE[n]; }
  Int_t RSSIZE(Int_t n) const { return fRSSIZE[n]; }
  Double_t TIME(Int_t n) const { return fTIME[n]; }
  TGraph* GraphVSIZE(void);
  TGraph* GraphRSSIZE(void);
  TGraph* GraphTIME(void);
  TH2* Frame(void) const ;
  Int_t       WriteToFile();
  AliMemoryWatcher & operator = (const AliMemoryWatcher &) { return *this; } 
private:
  UInt_t fMAXSIZE;     // maximum size of arrays where the informationis stored
  UInt_t fSize;        // the requested size of information to be retrieved
  Int_t* fX;           //[fMAXSIZE] array that contains the step numbers
  Int_t* fVSIZE;       //[fMAXSIZE] array that contains the virtual memory at each step
  Int_t* fRSSIZE;      //[fMAXSIZE] array that contains the real memory at each step
  Double_t* fTIME;     //[fMAXSIZE] array that contains the CPU time at each step
  TStopwatch* fTimer;  // the chronometer
  Bool_t fDisabled;    // to switch on/off the monitoring

  ClassDef(AliMemoryWatcher,2) // General purpose memory watcher

} ;
#endif