问题描述
似乎我的 shell 启动时间太长了方式.有什么方法可以对其进行分析，以便我可以弄清楚是什么让它如此缓慢?
It seems like my shell is taking way too long to start up. Is there any way to profile it so I can figure out what's slowing it down so much?
推荐答案
尝试在文件开头添加:
# set the trace prompt to include seconds, nanoseconds, script name and line number
# This is GNU date syntax; by default Macs ship with the BSD date program, which isn't compatible
PS4='+$(date "+%s:%N") %N:%i> '
# save file stderr to file descriptor 3 and redirect stderr (including trace
# output) to a file with the script's PID as an extension
exec 3>&2 2>/tmp/startlog.$$
# set options to turn on tracing and expansion of commands contained in the prompt
setopt xtrace prompt_subst
最后是:
# turn off tracing
unsetopt xtrace
# restore stderr to the value saved in FD 3
exec 2>&3 3>&-
你应该得到一个详细的日志，显示每行执行的 epoch_second.nanosecond 时间.请注意，需要 GNU date(和操作系统支持)才能获得纳秒输出.
And you should get a detailed log showing the epoch_second.nanosecond time of the execution of each line. Note that GNU date (and OS support) is required to have nanosecond output.
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编辑 2:
如果你有 zsh 4.3.12 或更高版本，你应该能够像这样设置 PS4 而不是使用 date 命令:
If you have zsh 4.3.12 or later, you should be able to set PS4 like this instead of using the date command:
zmodload zsh/datetime
setopt promptsubst
PS4='+$EPOCHREALTIME %N:%i> '
它应该适用于 Linux 和 OS X 以提供纳秒级精度.
which should work on both Linux and OS X to give you nanosecond precision.
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