• Simon Marlow's avatar
    Add optional eager black-holing, with new flag -feager-blackholing · d600bf7a
    Simon Marlow authored
    Eager blackholing can improve parallel performance by reducing the
    chances that two threads perform the same computation.  However, it
    has a cost: one extra memory write per thunk entry.  
    To get the best results, any code which may be executed in parallel
    should be compiled with eager blackholing turned on.  But since
    there's a cost for sequential code, we make it optional and turn it on
    for the parallel package only.  It might be a good idea to compile
    applications (or modules) with parallel code in with
    ToDo: document -feager-blackholing.