一直对 go tool pprof xxx.prof字段不是很了解，群里人发了官方文档，翻一下做个记录
(pprof) top10
Total: 2525 samples
298 11.8% 11.8% 345 13.7% runtime.mapaccess1_fast64
268 10.6% 22.4% 2124 84.1% main.FindLoops
251 9.9% 32.4% 451 17.9% scanblock
178 7.0% 39.4% 351 13.9% hash_insert
131 5.2% 44.6% 158 6.3% sweepspan
119 4.7% 49.3% 350 13.9% main.DFS
96 3.8% 53.1% 98 3.9% flushptrbuf
95 3.8% 56.9% 95 3.8% runtime.aeshash64
95 3.8% 60.6% 101 4.0% runtime.settype_flush
88 3.5% 64.1% 988 39.1% runtime.mallocgc
原文：
When CPU profiling is enabled, the Go program stops about 100 times per second and records a sample consisting of the program counters on the currently executing goroutine's stack. The profile has 2525 samples, so it was running for a bit over 25 seconds. In the go tool pprof output, there is a row for each function that appeared in a sample. The first two columns show the number of samples in which the function was running (as opposed to waiting for a called function to return), as a raw count and as a percentage of total samples. The runtime.mapaccess1_fast64 function was running during 298 samples, or 11.8%. The top10 output is sorted by this sample count. The third column shows the running total during the listing: the first three rows account for 32.4% of the samples. The fourth and fifth columns show the number of samples in which the function appeared (either running or waiting for a called function to return). The main.FindLoops function was running in 10.6% of the samples, but it was on the call stack (it or functions it called were running) in 84.1% of the samples.
翻译：
当CPU profiling开启，Go程序1秒钟停止100次，来对goroutine栈调用进行连续采样并记录
本次调试总计有2525个采样，所以他执行时间超过25s
在go tool pprof输出里，采样里的每个function有一行信息对应
前面2列是关于function在运行状态所在的所在的原始总样本数量和总比例
runtime.mapaccess1_fast64这个function在298个样本里运行过，或者占总比例的11.8%
top 10的输出是按照样本数倒叙排列的
第3列显示运行总是占列表里的比例，前面3行占样本的32.4%（第3行第3列：11.8%+10.6%+9.9%）
第4，5列展示function出现过的样本数和比例
main.FindLoops这个function只在10.6%的样本里执行过，但是在84.1%的调用栈里出现过
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