如何读懂火焰图？
http://www.ruanyifeng.com/blog/2017/09/flame-graph.html
Flame Graphs
https://www.brendangregg.com/flamegraphs.html
JVM CPU Profiler技术原理及源码深度解析
https://tech.meituan.com/2019/10/10/jvm-cpu-profiler.html
async-profiler 分析Java应用CPU和内存分配
https://www.cnblogs.com/blogabc/p/15559850.html
Async-Profiler - Java 火焰图性能分析工具
https://www.wdbyte.com/2019/12/async-profiler/#async-profiler-%E4%BB%8B%E7%BB%8D
Sampling CPU and HEAP profiler for Java featuring AsyncGetCallTrace + perf_events
https://github.com/jvm-profiling-tools/async-profiler
cpu分析利器 — async-profiler
https://stackoverflow.com/questions/43652021/bash-fork-cannot-allocate-memory
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