promoon opened a new issue, #2658:
URL: https://github.com/apache/brpc/issues/2658
**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)**
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