Hi Alex,
A couple of months ago I did an investigation on the slow boot time of
`lein repl`. As you said, a lot of time (around 30% time on my computer)
are spent on the features like completion. Also, I notice that there is a
parsing library called `sjacket ` at https://github.com/cgrand/sjacket ,
which provides the functionality to generating the parsing tree on the fly.
Unfortunately it seems that the parser itself is constructed every time
during the startup time, although the parser itself is always the same
every time. My idea the thoughts are put at
https://github.com/cgrand/sjacket/issues/24 , and I guess it would be
interesting to let somebody who is concerned to notice.
在 2016年2月11日星期四 UTC-5下午4:47:34，Alex Miller写道：
>
> Nice! I have some stuff similar to this I use, but this is nicely packaged.
>
> On Thu, Feb 11, 2016 at 2:30 PM, Ryan Fowler <ryan....@singlewire.com
> <javascript:>> wrote:
>
>> On Tue, Feb 9, 2016 at 12:36 PM, Alex Miller <al...@puredanger.com
>> <javascript:>> wrote:
>>
>>> I'm doing some research on slow Clojure boot time and would be
>>> interested in collecting info about example use cases where it's been a
>>> problem for people.
>>>
>>
>> The following snippet helps me visualize load times. It might be helpful
>> to others. The output is a bit long, so I just added the code and
>> usage/output in a gist at
>> https://gist.github.com/ryfow/4283b64b4dd205d610e8
>>
>> (def ^:dynamic *indent* 0)
>> (alter-var-root
>> #'clojure.core/load
>> (fn [orig]
>> (fn [& paths]
>> (let [t (System/nanoTime)
>> r (binding [*indent* (inc *indent*)]
>> (apply orig paths))]
>> (binding [*out* *err*]
>> (println (apply str (repeat *indent* " ")) (/ (-
>> (System/nanoTime) t) 1000000.0) paths)
>> (flush))
>> r))))
>>
>> ;; Require namespace in question here
>> (require 'clojure.core.async)
>>
>>
>>
>>
>
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