【 云收藏】Linux perf Examples

摘录

perf Examples

Image license: creative commons Attribution-ShareAlike 4.0.
These are some examples of using the perf Linux profiler, which has also been called Performance Counters for Linux (PCL), Linux perf events (LPE), or perf_events. Like Vince Weaver, I'll call it perf_events so that you can search on that term later. Searching for just "perf" finds sites on the police, petroleum, weed control, and a T-shirt. This is not an official perf page, for either perf_events or the T-shirt.
perf_events is an event-oriented observability tool, which can help you solve advanced performance and troubleshooting functions. Questions that can be answered include:
Why is the kernel on-CPU so much? What code-paths?
Which code-paths are causing CPU level 2 cache misses?
Are the CPUs stalled on memory I/O?
Which code-paths are allocating memory, and how much?
What is triggering TCP retransmits?
Is a certain kernel function being called, and how often?
What reasons are threads leaving the CPU?

点评

NULL

原文

点击这里查看原文

其它

本帖内容由21QA云收藏工具自动生成，欢迎使用。