标签：http 文件中 设置 cpu cts byte 栈帧 cache profiler
关于如何使用pprof进行profiling的问题，请参考https://studygolang.com/articles/7069，本文仅做一些补充。
1. http://xxx:6060/debug/pprof/heap?debug=1页面的解释
heap profile: 219: 286339776 [29791: 2945785336] @ heap/1048576
其中 219 —— 当前快照中看到的尚存活的堆对象的数量
286339776 —— 当前快照中看到的尚存活的堆对象的字节数
29791 —— 当前快照中看到的分配过的堆对象（包括已经释放的）的数量
29791 —— 当前快照中看到的分配过的堆对象（包括已经释放的）的字节数
1048576 —— MemProfileRate * 2
对于每个具体的对象，数据格式为
8: 62062592 [12: 93093888] @ 0x8fd38f 0x8fe4fa 0x8fa5f0 0x90714e 0x909b36 0x46bc31
其中, 8 —— 当前callstack上尚存活的对象数
62062592 —— 当前callstack上尚存活的对象占用字节数
12 —— 当前callstack上总过分配过的（包括已释放的）对象数
93093888 ——当前callstack上总过分配过的（包括已释放的）对象占用的字节数
@后面的内容 —— 当前callstack的栈帧，和下面解析的的callstack一致
这些内容都是在pprof.go文件中输出的，具体参看代码
fmt.Fprintf(w, "heap profile: %d: %d [%d: %d] @ heap/%d\n",
total.InUseObjects(), total.InUseBytes(),
total.AllocObjects, total.AllocBytes,
2*runtime.MemProfileRate)
for i := range p {
r := &p[i]
fmt.Fprintf(w, "%d: %d [%d: %d] @",
r.InUseObjects(), r.InUseBytes(),
r.AllocObjects, r.AllocBytes)
for _, pc := range r.Stack() {
fmt.Fprintf(w, " %#x", pc)
}
fmt.Fprintf(w, "\n")
printStackRecord(w, r.Stack(), false)
}
// Print memstats information too.
// Pprof will ignore, but useful for people
s := new(runtime.MemStats)
runtime.ReadMemStats(s)
fmt.Fprintf(w, "\n# runtime.MemStats\n")
fmt.Fprintf(w, "# Alloc = %d\n", s.Alloc)
fmt.Fprintf(w, "# TotalAlloc = %d\n", s.TotalAlloc)
fmt.Fprintf(w, "# Sys = %d\n", s.Sys)
fmt.Fprintf(w, "# Lookups = %d\n", s.Lookups)
fmt.Fprintf(w, "# Mallocs = %d\n", s.Mallocs)
fmt.Fprintf(w, "# Frees = %d\n", s.Frees)
fmt.Fprintf(w, "# HeapAlloc = %d\n", s.HeapAlloc)
fmt.Fprintf(w, "# HeapSys = %d\n", s.HeapSys)
fmt.Fprintf(w, "# HeapIdle = %d\n", s.HeapIdle)
fmt.Fprintf(w, "# HeapInuse = %d\n", s.HeapInuse)
fmt.Fprintf(w, "# HeapReleased = %d\n", s.HeapReleased)
fmt.Fprintf(w, "# HeapObjects = %d\n", s.HeapObjects)
fmt.Fprintf(w, "# Stack = %d / %d\n", s.StackInuse, s.StackSys)
fmt.Fprintf(w, "# MSpan = %d / %d\n", s.MSpanInuse, s.MSpanSys)
fmt.Fprintf(w, "# MCache = %d / %d\n", s.MCacheInuse, s.MCacheSys)
fmt.Fprintf(w, "# BuckHashSys = %d\n", s.BuckHashSys)
fmt.Fprintf(w, "# GCSys = %d\n", s.GCSys)
fmt.Fprintf(w, "# OtherSys = %d\n", s.OtherSys)
fmt.Fprintf(w, "# NextGC = %d\n", s.NextGC)
fmt.Fprintf(w, "# LastGC = %d\n", s.LastGC)
fmt.Fprintf(w, "# PauseNs = %d\n", s.PauseNs)
fmt.Fprintf(w, "# PauseEnd = %d\n", s.PauseEnd)
fmt.Fprintf(w, "# NumGC = %d\n", s.NumGC)
fmt.Fprintf(w, "# NumForcedGC = %d\n", s.NumForcedGC)
fmt.Fprintf(w, "# GCCPUFraction = %v\n", s.GCCPUFraction)
fmt.Fprintf(w, "# DebugGC = %v\n", s.DebugGC)
如果觉得heap profile中打印的活跃对象数和HeapObjects数量差别太大，可以将MemProfileRate设置为一个更小的值（默认为512*1024），设置为1，快照中就可以看到完整的堆对象分配情况。
标签：http 文件中 设置 cpu cts byte 栈帧 cache profiler
原文地址：http://www.cnblogs.com/stephenlyu/p/7777998.html
