During a transatlantic flight I had the opportunity to read this book on parallel programming for .Net. It describes some of the higher level constructs available in .Net that make it easier to implement parallel algorithms. Of course the big issue is that you need to (re)design your algorithms to make parallel operations effective or even possible. Some algorithms are just not very amenable to be parallelized (the Simplex method for LP being a good example). The book contains enough warnings to make you think twice before starting to work on parallel implementations.
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