Make 'thread' information available into the graph

[tarun27sh]

Some way to differentiate functions based on threads.
This will highlight any specific code which is run by only one thread or run by multiple.

Options

1. Allocate a unique color for each thread.
   Pros: Good way to see what each thread is doing
   Cons: For large number of threads, and some threads calling common code, it'll become messy.

2. Per function, track no_of_threads calling this function, keep a counter.
   And when displaying, assign weights to node size based on this counter.

Check out D3 & Gephi for visualization