[u/mrichter/AliRoot.git] / STEER / AliSysInfo.cxx

/**************************************************************************
 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
 *                                                                        *
 * Author: The ALICE Off-line Project.                                    *
 * Contributors are mentioned in the code where appropriate.              *
 *                                                                        *
 * Permission to use, copy, modify and distribute this software and its   *
 * documentation strictly for non-commercial purposes is hereby granted   *
 * without fee, provided that the above copyright notice appears in all   *
 * copies and that both the copyright notice and this permission notice   *
 * appear in the supporting documentation. The authors make no claims     *
 * about the suitability of this software for any purpose. It is          *
 * provided "as is" without express or implied warranty.                  *
 **************************************************************************/


//
// Origin:  marian.ivanov@cern.ch
//
//  Make   a log file for the CPU and Memory usage
//
//  Principles:
//  Snapshots of the system information are writen to the text log files.
//  Text files were chosen in order to get the ouptu also in case code 
//  is crashing. 
//  Following information is stored in the log file:
//  TTimeStamp stamp;
//  CpuInfo_t  cpuInfo;
//  MemInfo_t  memInfo;
//  ProcInfo_t procInfo;
// 
//  Root TSystem is used to retrieve this information:
//  gSystem->GetCpuInfo(&cpuInfo, 10);
//  gSystem->GetMemInfo(&memInfo);
//  gSystem->GetProcInfo(&procInfo);
//  for details see:
//  http://root.cern.ch/root/html/TUnixSystem.html
//  http://root.cern.ch/root/html/ProcInfo_t.html
//  http://root.cern.ch/root/html/MemInfo_t.html
//  http://root.cern.ch/root/html/CpuInfo_t.html
//  -------------------------------------------------------------------
//  class CpuInfo_t
//   Float_t	fIdle	cpu idle percentage
//   Float_t	fLoad15m	cpu load average over 15 m
//   Float_t	fLoad1m	cpu load average over 1 m
//   Float_t	fLoad5m	cpu load average over 5 m
//   Float_t	fSys	cpu sys load in percentage
//   Float_t	fTotal	cpu user+sys load in percentage
//   Float_t	fUser	cpu user load in percentage

//  -------------------------------------------------------------------
//  class ProcInfo_t:
//  Float_t	fCpuSys	system time used by this process in seconds
//  Float_t	fCpuUser	user time used by this process in seconds
//  Long_t	fMemResident	resident memory used by this process in KB
//  Long_t	fMemVirtual	virtual memory used by this process in KB
//  -------------------------------------------------------------------


//  The information from the AliSysInfo can be used as measurement
//  of the code quality. Be aware of the limitation induced by
//  using only system info described in the  AliSysInfo::Test() function
// 
//  The example usage of the AliSysInfo is shown in the
//  AliSysInfo::Test() example.
//  
//  
//
//  
//  The typical usage in the AliRoot code:
//  Make a set of stamps in the code in the place of interest
//  e.g. 
//
//  AliSysInfo::AddStamp("Start");
//
//  loader->UnloadRecPoints();
//    AliSysInfo::AddStamp(Form("LRec%s_%d",fgkDetectorName[iDet],eventNr), iDet,1,eventNr);
//

// The log file can be transformed to the tree - to make a visualization
// See $ALICE_ROOT/macros/PlotSysInfo.C as an example


#include <Riostream.h>
#include "AliLog.h"
#include "TStopwatch.h"
#include "TSystem.h"
#include "TTree.h"

#include "TTimeStamp.h"
#include "AliSysInfo.h"

//#include "TMemStatManager.h"  //USE IFDEF


ClassImp(AliSysInfo)

AliSysInfo* AliSysInfo::fInstance=0;

AliSysInfo::AliSysInfo():
    TObject(),
    fSysWatch(0),
    fTimer(0),
    fMemStat(0),
    fCallBackFunc(0),
    fNCallBack(0)
{
  fTimer = new TStopwatch;
  fSysWatch  = new fstream("syswatch.log", ios_base::out|ios_base::trunc);

  //hname/C:sname/C:sec/D:mI.fMemUsed/F:mI.fSwapUsed/F:pI.fMemResident/F:pI.fMemVirtual/F:cI.fUser/F:cI.fSys/F:cI.fCpuUser/F:pI.fCpuSys/F


  (*fSysWatch) <<"hname"<<"/C:"               // hname - hostname  
               <<"sname"<<"/C:"              // stamp name
               <<"id0"<<"/I:"                // 0 id
               <<"id1"<<"/I:"                // 1 id
               <<"id2"<<"/I:"                // 1 id
               <<"first"<<"/D:"              // first stamp
    //
	       <<"stampSec"<<"/D:"         // time  - time stamp in seconds
	       <<"mi.fMemUsed"<<"/D:"       // system info 
	       <<"mi.fSwapUsed"<<"/D:"      //
	       <<"cI.fUser"<<"/D:"         //
	       <<"cI.fSys"<<"/D:"         //
    // 
	       <<"pI.fMemResident"<<"/D:"  // process info
	       <<"pI.fMemVirtual"<<"/D:"   //    
	       <<"pI.fCpuUser"<<"/D:"      //
	       <<"pI.fCpuSys"<<"/D:"       //
    //
    	       <<"stampOldSec"<<"/D:"         // time  - time stamp in seconds
	       <<"miOld.fMemUsed"<<"/D:"       // system info - previous
	       <<"miOld.fSwapUsed"<<"/D:"      //
	       <<"cIOld.fUser"<<"/D:"         //
	       <<"cIOld.fSys"<<"/D:"         //
    // 
	       <<"pIOld.fMemResident"<<"/D:"  // process info -previous
	       <<"pIOld.fMemVirtual"<<"/D:"   //    
	       <<"pIOld.fCpuUser"<<"/D:"      //
	       <<"pIOld.fCpuSys"<<"/D"       //
	       << endl;
  
}


AliSysInfo * AliSysInfo::Instance(){
  //
  //
  //
  if (!fInstance){
    fInstance = new AliSysInfo;
  }
  return fInstance;
}


void AliSysInfo::AddStamp(const char *sname, Int_t id0, Int_t id1, Int_t id2){
  //
  // 
  //
  //
  TTimeStamp stamp;
  CpuInfo_t  cpuInfo;
  MemInfo_t  memInfo;
  ProcInfo_t procInfo;  
  gSystem->GetCpuInfo(&cpuInfo, 10);
  gSystem->GetMemInfo(&memInfo);
  gSystem->GetProcInfo(&procInfo);
  //  procInfo.fMemVirtual/=1024;  //size in MBy
  //procInfo.fMemResident/=1024;  //size in MBy

  const char * hname = gSystem->HostName();

  static Int_t entry=0;
  static Double_t  first=stamp.GetSec()+stamp.GetNanoSec()/1000000000.;
  //
  static TTimeStamp stampOld;
  static CpuInfo_t  cpuInfoOld;
  static MemInfo_t  memInfoOld;
  static ProcInfo_t procInfoOld;  


  (*(Instance()->fSysWatch)) 
    << hname   <<"\t"               // hname - hostname  
    << sname    <<"\t"              // stamp name
    << id0      <<"\t"
    << id1      <<"\t"
    << id2      <<"\t"
    <<setprecision(15)<< first    <<"\t"              // first stamp               
    //
    <<setprecision(15)<< stamp.GetSec()+stamp.GetNanoSec()/1000000000.<<"\t"         // time  - time stamp in seconds
    << memInfo.fMemUsed<<"\t"       // system info 
    << memInfo.fSwapUsed<<"\t"      //
    << cpuInfo.fUser <<"\t"         //
    << cpuInfo.fSys  <<"\t"         //
    // 
    <<setprecision(15)<< procInfo.fMemResident/1024.<<"\t"  // process info
    <<setprecision(15)<< procInfo.fMemVirtual/1024.<<"\t"   //    
    << procInfo.fCpuUser<<"\t"      //
    << procInfo.fCpuSys<<"\t"       //
    //
    <<setprecision(15)<< stampOld.GetSec()+stampOld.GetNanoSec()/1000000000.<<"\t"         // time  - time stamp in seconds
    << memInfoOld.fMemUsed<<"\t"       // system info - previous
    << memInfoOld.fSwapUsed<<"\t"      //
    << cpuInfoOld.fUser <<"\t"         //
    << cpuInfoOld.fSys  <<"\t"         //
    // 
    <<setprecision(15)<< procInfoOld.fMemResident/1024.<<"\t"  // process info -previous
    <<setprecision(15)<< procInfoOld.fMemVirtual/1024.<<"\t"   //    
    << procInfoOld.fCpuUser<<"\t"      //
    << procInfoOld.fCpuSys<<"\t"       //
    << endl;

  stampOld   = stamp;
  cpuInfoOld = cpuInfo;
  memInfoOld = memInfo;
  procInfoOld= procInfo;

  //  if (fInstance->fMemStat) fInstance->fMemStat->AddStamps(sname);
  for (Int_t icallback=0; icallback<Instance()->fNCallBack; icallback++){
    Instance()->fCallBackFunc[icallback](sname);
  }
  entry++;
}


TTree * AliSysInfo::MakeTree(const char *lname){
  // char * lname = "syswatch.log"
  TTree * tree = new TTree;
  tree->ReadFile(lname);
  tree->SetAlias("deltaT","stampSec-stampOldSec");
  tree->SetAlias("T","stampSec-first");
  tree->SetAlias("deltaVM","(pI.fMemVirtual-pIOld.fMemVirtual)");
  tree->SetAlias("VM","pI.fMemVirtual");
  return tree;
}


Bool_t AliSysInfo::Contain(const char * str1, const char * str2){
  //
  //
  //
  TString str(str1);
  return str.Contains(str2);
}


void AliSysInfo::OpenMemStat(){
  //
  //
  //
  //USE IFDEF if MEMSTAT ENABLED  
  //  Instance()->fMemStat = TMemStatManager::GetInstance();
  //   Instance()->fMemStat->SetAutoStamp(10000000, 10000000,1000000);
  //   Instance()->fMemStat->Enable();  
}

void AliSysInfo::CloseMemStat(){
  //
  //
  //
  //USE IFDEF if MEMSTAT ENABLED
  //if (Instance()->fMemStat  == TMemStatManager::GetInstance()) Instance()->fMemStat->Close();
  //Instance()->fMemStat=0;
}


void AliSysInfo::AddCallBack(StampCallback_t callback){
  //
  // add cal back function
  //
  AliSysInfo *info =  Instance();
  if (!info->fCallBackFunc)
    info->fCallBackFunc = new StampCallback_t[100];
  info->fCallBackFunc[info->fNCallBack]=callback;
  info->fNCallBack++;
}


TTree*  AliSysInfo::Test(){
  //
  // Test example for AliSysInfo:
  // 1. Make huge memory leak
  // 2. Slow down execution
  /*
    To use the test:
    TTree * tree = AliSysInfo::Test();
    // Make alias what we set as input
    tree->SetAlias("deltaVMIn","(id0*100000+id1*10000+id2*1000)/1000000.")
    tree->SetAlias("deltaVM","(pI.fMemVirtual-pIOld.fMemVirtual)");
    tree->SetAlias("deltaTIn","(id1+id0*10)");
    tree->SetAlias("deltaT","stampSec-stampOldSec");
    //
    tree->SetMarkerStyle(23); tree->SetMarkerSize(0.5);
    // Memory usage
    tree->Draw("deltaVM:deltaVMIn","Entry$>0");
    // or alternative
    tree->Draw("deltaVM:deltaVMIn","Entry$>0","prof");
    //
    // draw time usage
    tree->Draw("deltaT:deltaTIn","Entry$>0"); 
  */
  //
  // The delta of VM as obtained from the AliSysInfo starts to be proportional
  // to  the input allocation after 0.12 MBy (and it is system dependent) 
  // Bellow these limit the deltaVM can be used only in mean.
  // (compare first and  profile histogram)
  for (Int_t id0=0; id0<5; id0++)
    for (Int_t id1=1; id1<10; id1++)
      for (Int_t id2=0; id2<20; id2++){
	new Char_t[id2*1000+id1*10000+id0*100000];  // emulate memory leak
	gSystem->Sleep(id1+id0*10);         // emulate CPU usage 
	AliSysInfo::AddStamp("Leak",id0,id1,id2);
      }
  TTree * tree = AliSysInfo::MakeTree("syswatch.log");
  return tree;  
}
Commit	Line	Data
0e8bc704	1	/**************************************************************************
	2	* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
	3	* *
	4	* Author: The ALICE Off-line Project. *
	5	* Contributors are mentioned in the code where appropriate. *
	6	* *
	7	* Permission to use, copy, modify and distribute this software and its *
	8	* documentation strictly for non-commercial purposes is hereby granted *
	9	* without fee, provided that the above copyright notice appears in all *
	10	* copies and that both the copyright notice and this permission notice *
	11	* appear in the supporting documentation. The authors make no claims *
	12	* about the suitability of this software for any purpose. It is *
	13	* provided "as is" without express or implied warranty. *
	14	**************************************************************************/
	15
	16
6efecea1	17	//
	18	// Origin: marian.ivanov@cern.ch
	19	//
	20	// Make a log file for the CPU and Memory usage
ab557934	21	//
	22	// Principles:
	23	// Snapshots of the system information are writen to the text log files.
	24	// Text files were chosen in order to get the ouptu also in case code
	25	// is crashing.
	26	// Following information is stored in the log file:
	27	// TTimeStamp stamp;
	28	// CpuInfo_t cpuInfo;
	29	// MemInfo_t memInfo;
	30	// ProcInfo_t procInfo;
	31	//
	32	// Root TSystem is used to retrieve this information:
	33	// gSystem->GetCpuInfo(&cpuInfo, 10);
	34	// gSystem->GetMemInfo(&memInfo);
	35	// gSystem->GetProcInfo(&procInfo);
	36	// for details see:
	37	// http://root.cern.ch/root/html/TUnixSystem.html
	38	// http://root.cern.ch/root/html/ProcInfo_t.html
	39	// http://root.cern.ch/root/html/MemInfo_t.html
	40	// http://root.cern.ch/root/html/CpuInfo_t.html
	41	// -------------------------------------------------------------------
	42	// class CpuInfo_t
	43	// Float_t fIdle cpu idle percentage
	44	// Float_t fLoad15m cpu load average over 15 m
	45	// Float_t fLoad1m cpu load average over 1 m
	46	// Float_t fLoad5m cpu load average over 5 m
	47	// Float_t fSys cpu sys load in percentage
	48	// Float_t fTotal cpu user+sys load in percentage
	49	// Float_t fUser cpu user load in percentage
	50
	51	// -------------------------------------------------------------------
	52	// class ProcInfo_t:
	53	// Float_t fCpuSys system time used by this process in seconds
	54	// Float_t fCpuUser user time used by this process in seconds
	55	// Long_t fMemResident resident memory used by this process in KB
	56	// Long_t fMemVirtual virtual memory used by this process in KB
	57	// -------------------------------------------------------------------
	58
	59
	60	// The information from the AliSysInfo can be used as measurement
	61	// of the code quality. Be aware of the limitation induced by
	62	// using only system info described in the AliSysInfo::Test() function
	63	//
	64	// The example usage of the AliSysInfo is shown in the
	65	// AliSysInfo::Test() example.
	66	//
6efecea1	67	//
ab557934	68	//
	69	//
	70	// The typical usage in the AliRoot code:
6efecea1	71	// Make a set of stamps in the code in the place of interest
	72	// e.g.
	73	//
	74	// AliSysInfo::AddStamp("Start");
	75	//
	76	// loader->UnloadRecPoints();
	77	// AliSysInfo::AddStamp(Form("LRec%s_%d",fgkDetectorName[iDet],eventNr), iDet,1,eventNr);
	78	//
	79
	80	// The log file can be transformed to the tree - to make a visualization
	81	// See $ALICE_ROOT/macros/PlotSysInfo.C as an example
	82
	83
0e8bc704	84	#include <Riostream.h>
	85	#include "AliLog.h"
	86	#include "TStopwatch.h"
	87	#include "TSystem.h"
	88	#include "TTree.h"
	89
	90	#include "TTimeStamp.h"
	91	#include "AliSysInfo.h"
	92
6efecea1	93	//#include "TMemStatManager.h" //USE IFDEF
6efecea1	94
0e8bc704	95
	96	ClassImp(AliSysInfo)
	97
	98	AliSysInfo* AliSysInfo::fInstance=0;
	99
	100	AliSysInfo::AliSysInfo():
	101	TObject(),
	102	fSysWatch(0),
6efecea1	103	fTimer(0),
d1d8b044	104	fMemStat(0),
	105	fCallBackFunc(0),
	106	fNCallBack(0)
0e8bc704	107	{
	108	fTimer = new TStopwatch;
	109	fSysWatch = new fstream("syswatch.log", ios_base::out\|ios_base::trunc);
6efecea1	110
ab557934	111	//hname/C:sname/C:sec/D:mI.fMemUsed/F:mI.fSwapUsed/F:pI.fMemResident/F:pI.fMemVirtual/F:cI.fUser/F:cI.fSys/F:cI.fCpuUser/F:pI.fCpuSys/F
0e8bc704	112
	113
	114	(*fSysWatch) <<"hname"<<"/C:" // hname - hostname
	115	<<"sname"<<"/C:" // stamp name
6efecea1	116	<<"id0"<<"/I:" // 0 id
	117	<<"id1"<<"/I:" // 1 id
	118	<<"id2"<<"/I:" // 1 id
ab557934	119	<<"first"<<"/D:" // first stamp
0e8bc704	120	//
ab557934	121	<<"stampSec"<<"/D:" // time - time stamp in seconds
	122	<<"mi.fMemUsed"<<"/D:" // system info
	123	<<"mi.fSwapUsed"<<"/D:" //
	124	<<"cI.fUser"<<"/D:" //
	125	<<"cI.fSys"<<"/D:" //
0e8bc704	126	//
ab557934	127	<<"pI.fMemResident"<<"/D:" // process info
	128	<<"pI.fMemVirtual"<<"/D:" //
	129	<<"pI.fCpuUser"<<"/D:" //
	130	<<"pI.fCpuSys"<<"/D:" //
0e8bc704	131	//
ab557934	132	<<"stampOldSec"<<"/D:" // time - time stamp in seconds
	133	<<"miOld.fMemUsed"<<"/D:" // system info - previous
	134	<<"miOld.fSwapUsed"<<"/D:" //
	135	<<"cIOld.fUser"<<"/D:" //
	136	<<"cIOld.fSys"<<"/D:" //
0e8bc704	137	//
ab557934	138	<<"pIOld.fMemResident"<<"/D:" // process info -previous
	139	<<"pIOld.fMemVirtual"<<"/D:" //
	140	<<"pIOld.fCpuUser"<<"/D:" //
	141	<<"pIOld.fCpuSys"<<"/D" //
0e8bc704	142	<< endl;
	143
	144	}
	145
	146
	147
	148
	149	AliSysInfo * AliSysInfo::Instance(){
	150	//
	151	//
	152	//
	153	if (!fInstance){
	154	fInstance = new AliSysInfo;
	155	}
	156	return fInstance;
	157	}
	158
	159
6efecea1	160	void AliSysInfo::AddStamp(const char *sname, Int_t id0, Int_t id1, Int_t id2){
0e8bc704	161	//
	162	//
	163	//
0e8bc704	164	//
0e8bc704	165	TTimeStamp stamp;
	166	CpuInfo_t cpuInfo;
	167	MemInfo_t memInfo;
	168	ProcInfo_t procInfo;
	169	gSystem->GetCpuInfo(&cpuInfo, 10);
	170	gSystem->GetMemInfo(&memInfo);
	171	gSystem->GetProcInfo(&procInfo);
ab557934	172	// procInfo.fMemVirtual/=1024; //size in MBy
ab557934	173	//procInfo.fMemResident/=1024; //size in MBy
d1d8b044	174
0e8bc704	175	const char * hname = gSystem->HostName();
	176
	177	static Int_t entry=0;
ab557934	178	static Double_t first=stamp.GetSec()+stamp.GetNanoSec()/1000000000.;
0e8bc704	179	//
	180	static TTimeStamp stampOld;
	181	static CpuInfo_t cpuInfoOld;
	182	static MemInfo_t memInfoOld;
	183	static ProcInfo_t procInfoOld;
	184
	185
ab557934	186	(*(Instance()->fSysWatch))
	187	<< hname <<"\t" // hname - hostname
	188	<< sname <<"\t" // stamp name
	189	<< id0 <<"\t"
	190	<< id1 <<"\t"
	191	<< id2 <<"\t"
	192	<<setprecision(15)<< first <<"\t" // first stamp
0e8bc704	193	//
ab557934	194	<<setprecision(15)<< stamp.GetSec()+stamp.GetNanoSec()/1000000000.<<"\t" // time - time stamp in seconds
	195	<< memInfo.fMemUsed<<"\t" // system info
	196	<< memInfo.fSwapUsed<<"\t" //
	197	<< cpuInfo.fUser <<"\t" //
	198	<< cpuInfo.fSys <<"\t" //
	199	//
	200	<<setprecision(15)<< procInfo.fMemResident/1024.<<"\t" // process info
	201	<<setprecision(15)<< procInfo.fMemVirtual/1024.<<"\t" //
	202	<< procInfo.fCpuUser<<"\t" //
	203	<< procInfo.fCpuSys<<"\t" //
	204	//
	205	<<setprecision(15)<< stampOld.GetSec()+stampOld.GetNanoSec()/1000000000.<<"\t" // time - time stamp in seconds
	206	<< memInfoOld.fMemUsed<<"\t" // system info - previous
	207	<< memInfoOld.fSwapUsed<<"\t" //
	208	<< cpuInfoOld.fUser <<"\t" //
	209	<< cpuInfoOld.fSys <<"\t" //
	210	//
	211	<<setprecision(15)<< procInfoOld.fMemResident/1024.<<"\t" // process info -previous
	212	<<setprecision(15)<< procInfoOld.fMemVirtual/1024.<<"\t" //
	213	<< procInfoOld.fCpuUser<<"\t" //
	214	<< procInfoOld.fCpuSys<<"\t" //
	215	<< endl;
	216
0e8bc704	217	stampOld = stamp;
	218	cpuInfoOld = cpuInfo;
	219	memInfoOld = memInfo;
6efecea1	220	procInfoOld= procInfo;
	221
	222	// if (fInstance->fMemStat) fInstance->fMemStat->AddStamps(sname);
d1d8b044	223	for (Int_t icallback=0; icallback<Instance()->fNCallBack; icallback++){
	224	Instance()->fCallBackFunc[icallback](sname);
	225	}
0e8bc704	226	entry++;
	227	}
	228
	229
	230	TTree * AliSysInfo::MakeTree(const char *lname){
	231	// char * lname = "syswatch.log"
	232	TTree * tree = new TTree;
	233	tree->ReadFile(lname);
	234	tree->SetAlias("deltaT","stampSec-stampOldSec");
6efecea1	235	tree->SetAlias("T","stampSec-first");
d1d8b044	236	tree->SetAlias("deltaVM","(pI.fMemVirtual-pIOld.fMemVirtual)");
d1d8b044	237	tree->SetAlias("VM","pI.fMemVirtual");
0e8bc704	238	return tree;
	239	}
	240
6efecea1	241
	242	Bool_t AliSysInfo::Contain(const char * str1, const char * str2){
	243	//
	244	//
	245	//
	246	TString str(str1);
	247	return str.Contains(str2);
	248	}
	249
	250
	251
	252	void AliSysInfo::OpenMemStat(){
	253	//
	254	//
	255	//
	256	//USE IFDEF if MEMSTAT ENABLED
	257	// Instance()->fMemStat = TMemStatManager::GetInstance();
	258	// Instance()->fMemStat->SetAutoStamp(10000000, 10000000,1000000);
	259	// Instance()->fMemStat->Enable();
	260	}
	261
	262	void AliSysInfo::CloseMemStat(){
	263	//
	264	//
	265	//
	266	//USE IFDEF if MEMSTAT ENABLED
	267	//if (Instance()->fMemStat == TMemStatManager::GetInstance()) Instance()->fMemStat->Close();
	268	//Instance()->fMemStat=0;
	269	}
d1d8b044	270
	271
	272
	273	void AliSysInfo::AddCallBack(StampCallback_t callback){
	274	//
	275	// add cal back function
	276	//
	277	AliSysInfo *info = Instance();
	278	if (!info->fCallBackFunc)
	279	info->fCallBackFunc = new StampCallback_t[100];
	280	info->fCallBackFunc[info->fNCallBack]=callback;
	281	info->fNCallBack++;
	282	}
ab557934	283
	284
	285
	286	TTree* AliSysInfo::Test(){
	287	//
	288	// Test example for AliSysInfo:
	289	// 1. Make huge memory leak
	290	// 2. Slow down execution
	291	/*
	292	To use the test:
	293	TTree * tree = AliSysInfo::Test();
	294	// Make alias what we set as input
	295	tree->SetAlias("deltaVMIn","(id0100000+id110000+id2*1000)/1000000.")
	296	tree->SetAlias("deltaVM","(pI.fMemVirtual-pIOld.fMemVirtual)");
	297	tree->SetAlias("deltaTIn","(id1+id0*10)");
	298	tree->SetAlias("deltaT","stampSec-stampOldSec");
	299	//
	300	tree->SetMarkerStyle(23); tree->SetMarkerSize(0.5);
	301	// Memory usage
	302	tree->Draw("deltaVM:deltaVMIn","Entry$>0");
	303	// or alternative
	304	tree->Draw("deltaVM:deltaVMIn","Entry$>0","prof");
	305	//
	306	// draw time usage
	307	tree->Draw("deltaT:deltaTIn","Entry$>0");
	308	*/
	309	//
	310	// The delta of VM as obtained from the AliSysInfo starts to be proportional
	311	// to the input allocation after 0.12 MBy (and it is system dependent)
	312	// Bellow these limit the deltaVM can be used only in mean.
	313	// (compare first and profile histogram)
	314	for (Int_t id0=0; id0<5; id0++)
	315	for (Int_t id1=1; id1<10; id1++)
	316	for (Int_t id2=0; id2<20; id2++){
	317	new Char_t[id21000+id110000+id0*100000]; // emulate memory leak
	318	gSystem->Sleep(id1+id0*10); // emulate CPU usage
	319	AliSysInfo::AddStamp("Leak",id0,id1,id2);
	320	}
	321	TTree * tree = AliSysInfo::MakeTree("syswatch.log");
	322	return tree;
	323	}