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About 10 years ago, we decided that the performance gains in single-core processors that come “for free” with advancing semiconductor processes were slowing down. Many chip makers switched to scaling the number of cores on a die, and promoted parallel programming for their products.

Today I learned that the free multicore lunch is over, too. You can no longer turn on all of the transistors in a single chip, so you can no longer get 2× the threads running by doubling the number of cores in your processor.

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