系统级性能优化通常包括两个阶段：性能剖析（performance profiling）和代码优化。 性能剖析的目标是寻找性能瓶颈，查找引发性能问题的原因及热点代码。 代码优化的目标是针对具体性能问题而优化代码或编译选项，以改善软件性能。 在性能剖析阶段，需要借助 ...

我们在《一文看懂Linux性能分析｜perf 原理》一文中介绍过，perf 是基于采样来对程序进行分析的。采样的步骤如下： 通过设置一个定时器，定时器的触发时间可以由用户设定。 定时器被触发后，将会调用采集函数收集当前运行环境的数据（如当前正在执行的 ...

A customer wants a new server to dedicate to its latest high-transaction Web app. Traffic on the current site is heavy and is expected to double in a year. What's needed is an accurate and reliable ...

I posted a blog last week that illustrated how time between each benchmark test can affect performance results. To show what we wanted, we used a small portion of a new benchmark that is built into ...