18. Multithreading

PRIOR TO 2004, increasing computer power primarily involved increasing the power of a single processor. Limits imposed by the physics of today’s silicon microchip technology have forestalled further increases in the power of single processors. Figure 18.1 shows the plateau and even a small drop back, as the threshold of computing power versus heat dissipation stabilized to more maintainable levels.

Figure 18.1: Clock Speeds over Time. (Graph compiled by Herb Sutter. Used with permission. Original at www.gotw.ca.)

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In spite of the plateau, computer power continues to grow and Moore’s Law remains on track as multiple cores (within ...

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