动态设置"TCMALLOC_SAMPLE_PARAMETER"以支持动态开关pprof/heap采样

apache / brpc

brpc is an Industrial-grade RPC framework using C++ Language, which is often used in high performance system such as Search, Storage, Machine learning, Advertisement, Recommendation etc. "brpc" means "better RPC".

Apache License 2.0

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Is your feature request related to a problem? (你需要的功能是否与某个问题有关?) pprof/heap 无法动态开启或关闭tcmalloc采样。

bool has_TCMALLOC_SAMPLE_PARAMETER() {

    static bool val = check_TCMALLOC_SAMPLE_PARAMETER();

    return val;

}

Describe the solution you'd like (描述你期望的解决方法) 能够支持通过设置"TCMALLOC_SAMPLE_PARAMETER" 环境变量动态开启/关闭tcmalloc采样

Describe alternatives you've considered (描述你想到的折衷方案) 这个val值为什么要设为static，是否可以去掉从而支持动态设置"TCMALLOC_SAMPLE_PARAMETER" 环境变量

Additional context/screenshots (更多上下文/截图)

apache / brpc

动态设置"TCMALLOC_SAMPLE_PARAMETER"以支持动态开关pprof/heap采样 #2658