Henry Rich Reveals J with Threads J9.4
The Array Cast
The PIX Is the Magic Box
The key to making a good test definition is do enough computation on the data that the computation takes more time than the transfer. Having the data operated on in fast cache in another task will be worth the data transfer. So far, there has been anything. Nothing has slowed down. But when the thread wants to go look and use that data, it finds that it's over in another core. It's in level three cache somewhere, and it has to be brought back in as if from level three cache. And that's where the time is found.
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