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Henry Rich Reveals J with Threads J9.4
The Array Cast
The Benefits of Multi-Threading
To get benefit from multi-threading, you need to have a high proportion of computation to data movement in and out. In the J implementation division is done by repetitive multiplication. So that would speed up all the really late LAPAC is faster for inversion. But if you had to invert a rational matrix or something, you would benefit from the multi- threading for that. If you're doing reduction that's computational, say a plus reduction, then you will get different results with multiple threads.
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