要想执行手工优化，必须了解底层处理器体系结构，从而充分地了解应该如何重构代码才能在给定的硬件平台上实现良好的性能。
To perform hand optimization, you must understand the underlying processor architecture to fully understand how the code should be restructured to perform well on a given hardware platform.
与其他子系统的优化工作不同，实际上在构建系统的体系结构设计阶段就应该开始进行磁盘 I/O 优化。
Unlike the tuning of other subsystems, tuning disk I/O should actually be started during the architectural phase of building your systems.
当前，人们正在对GNU编译器集进行重大革新，为POWER体系结构而进行性能优化。
Currently, the GNU Compiler Collection is undergoing a massive renovation regarding performance optimization for the POWER architecture.
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