The analysis class TMemStatShow can now restrict itself to a subset of the address range or/and
entry range in the data Tree if the machine where the analysis is run does not have enough memory.
You can restrict the address range to be analyzed via TMemStatShow::SetAddressRange
You can restrict the entry range to be analyzed via TMemStatShow::SetEntryRange
the option "gnubuiltin" is not anymore the default in TMemStat.


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Apply PNG size optimization, as proposed by Matthew Strait on Savannah
(issue #75506 https://savannah.cern.ch/bugs/?75506).


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To make an out of source build do, assuming the source is in ~/root:
   mkdir ~/root-x8664
   cd ~/root-x8664
   ~/root/configure
   make
This is convenient to build e.g. 32 and 64-bit version from one source, but
also needed for cross-compilation, where it is now possible to build in
a special directory only the compile time tools, like rootcint for the
host architecture while the binary is build for the remote architecture
(like iOS).


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// When TMemStat is active it recors every call to malloc/free in a ROOT Tree.
// You must be careful when running jobs with many millions (or more) of calls
// to malloc/free because the generated Tree may become very large.
// The TMemStat constructor TMemStat(const char* system, Int_t buffersize, Int_t maxcalls)
// has its 3 arguments optional:
//   -system refers to the internal algorithm to compute the back traces.
//    the recommended value is "gnubuiltin"
//   -buffersize is the number of calls to malloc or free that can be stored in one memory buffer.
//    when the buffer is full, the calls to malloc/free pointing to the same location
//    are eliminated and not written to the final Tree. The default value 100000
//    is such that between 50 and 90% of the calls are eliminated depending on the application.
//    You can set buffersize <=1 to keep every single call to malloc/free.
//   -maxcalls can set a limit for the maximum number of calls to be registered in the Tree.
//    The default value is 5000000.
// The 3 arguments can be set  in $ROOTSYS/etc/system.rootrc
//    Root.TMemStat.system      gnubuiltin
//    Root.TMemStat.buffersize  100000
//    Root.TMemStat.maxcalls    5000000


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//
// TMemStat::Show creates 3 canvases.
// -In canvas1 it displays a dynamic histogram showing for pages (10 kbytes by default)
//  the percentage of the page used.
//  A summary pave shows the total memory still in use when the TMemStat object
//  goes out of scope and the average occupancy of the pages.
//  The average occupancy gives a good indication of the memory fragmentation.
//
// -In canvas2 it displays the histogram of memory leaks in decreasing order.
//  when moving the mouse on this canvas, a tooltip shows the backtrace for the leak
//  in the bin below the mouse.
//
// -In canvas3 it displays the histogram of the nbigleaks largest leaks (default is 20)
//    for each leak, the number of allocs and average alloc size is shown.
//
//
// Simply do:
//   root > TMemStat::Show()
// or specifying arguments
//   root > TMemStat::Show(0.01,20,"mydir/mymemstat.root");
//
// The first argument to Show is the percentage of the time of the original job
// that produced the file after which the display is updated. By default update=0.01,
// ie 100 time intervals will be shown.
// The second argument is nbigleaks.
// The third argument is the imput file name (result of TMemStat).
// If this argument is omitted, the script will take the most recent file
// generated by TMemStat.


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update to release notes.


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#10729, #10730, #11020, #11021, #11022, #11023, #11024, #11641, #13316
#13367, #13371, #13952, #13953, #13954, #14214 (ostream state)


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Root.TMemStat 1
This way any existing ROOT application becomes trivial to run instrumented
with TMemStat.


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This class is called via CINT from the new static function TMemStat::Show.
The new documentation explaining how to use TMemstat and visualize the results is now:

// TMemStat records all the calls to malloc and free and write a TTree
// with the position where the memory is allocated/freed , as well as
// the number of bytes.
//
// To use the class TMemStat, add the following statement at the beginning
// of your script or program
//     TMemStat mm("gnubuiltin");
// or in an interactive session do something like:
//    root > TMemStat mm("gnubuiltin");
//    root > .x somescript.C
//    root > .q
//
// The file collected by TMemStat can be analyzed and results shown
// by executing the static function Show.
//
// TMemStat::Show creates 2 canvases.
// -In canvas1 it displays a dynamic histogram showing for pages (10 kbytes by default)
//  the percentage of the page used.
//  A summary pave shows the total memory still in use when the TMemStat object
//  goes out of scope and the average occupancy of the pages.
//  The average occupancy gives a good indication of the memory fragmentation.
//
// -In canvas2 it displays the histogram of memory leaks in decreasing order.
//  when moving the mouse on this canvas, a tooltip shows the backtrace for the leak
//  in the bin below the mouse.
//
// Simply do:
//   root > TMemStat::Show()
// or specifying arguments
//   root > TMemStat::Show(0.01,"mydir/mymemstat.root");
//
// The first argument to Show is the percentage of the time of the original job
// that produced the file after which the display is updated. By default update=0.01,
// ie 100 time intervals will be shown.
// The second argument is the imput file name (result of TMemStat).
// If this argument is omitted, the script will take the most recent file
// generated by TMemStat.


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   - remove string digests (cost too much)
   - use a simple pre-caching of digests and ids
   - cosmetic changes


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