Import Geant4 11.4.0 source tree

examples/extended/parallel/README.md

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+\page Examples_parallel Category "parallel"
+
+This directory includes example applications to demonstrate the usage of
+different techniques for achieving event parallelism with Geant4.
+
+- \ref Examples_MPI
+
+  The directory contains a native interface with MPI libraries, 
+  as a Geant4 UI library, and a set of parallelized examples.
+  Using this interface, users applications can be parllelized with 
+  different MPI compliant libraries, such as LAM/MPI, MPICH2, OpenMPI,
+  and so on. 
+
+- \ref ExampleThreadsafeScorers
+
+ This example demonstrates a very simple application where an energy
+ deposit and # of steps is accounted in thread-local (i.e. one instance per
+ thread) hits maps with underlying types of plain-old data (POD) and global
+ (i.e. one instance) hits maps with underlying types of atomics.