[英]What is runtime.kevent in a golang program's profile?
I am profiling a program where the vast majority (86%) of time is spent in two runtime functions: kevent and selectgo. 我正在分析一个程序,其中大部分时间(86%)花费在两个运行时函数上:kevent和selectgo。 I understand the select, but I don't know what kevent is (so I don't know where to start optimizing): 我了解选择,但是我不知道什么是kevent(所以我不知道从哪里开始优化):
Showing top 10 nodes out of 33
flat flat% sum% cum cum%
114.63s 65.79% 65.79% 114.63s 65.79% runtime.kevent /usr/local/Cellar/go/1.9.2/libexec/src/runtime/sys_darwin_amd64.s
19.26s 11.05% 76.85% 35.90s 20.60% runtime.selectgo /usr/local/Cellar/go/1.9.2/libexec/src/runtime/select.go
It's the network poller . 这是网络轮询器 。 There are multiple implementations: 有多种实现:
You're seeing kevent
due to being on Darwin. 您因为在达尔文(Darwin)上而看到了kevent
。 Basically, this is time spent waiting for I/O. 基本上,这是等待I / O所花费的时间。
Note that it's called netpoll, but it applies to file descriptors in general, so it may be network communication but it could just as well be file I/O. 请注意,它称为netpoll,但通常适用于文件描述符,因此它可能是网络通信,但也可能是文件I / O。
Here are more details about kqueue and epoll . 以下是有关kqueue和epoll的更多详细信息。
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