class AliSysInfo: public TObject

 char * lname = "syswatch.log"

USE IFDEF if MEMSTAT ENABLED
  Instance()->fMemStat = TMemStatManager::GetInstance();
   Instance()->fMemStat->SetAutoStamp(10000000, 10000000,1000000);
   Instance()->fMemStat->Enable();

USE IFDEF if MEMSTAT ENABLED
if (Instance()->fMemStat  == TMemStatManager::GetInstance()) Instance()->fMemStat->Close();
Instance()->fMemStat=0;

 add cal back function

 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)

 Estimate size of object as represented in the memory size in bytes
 Warnings:
  1. Only data memebrs which are persistent are counted
  2. Local copy of the object is temporary created in memory
  3. Do not use it in standard programs, time and memory consument procedure