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Date: Wed, 27 May 2015 09:14:12 -0600
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Subject: Re: Fish Shell Speed?
From: David Frascone <dave AT frascone DOT com>
To: cygwin AT cygwin DOT com
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Thanks guys.  I'm doing some settings based on a cwd change, so, I
could base it on that -- only do the checks if you change directories
and/or leave the repo.  I'll play with that.

On Wed, May 27, 2015 at 8:09 AM, Andrew Schulman
<schulman DOT andrew AT epa DOT gov> wrote:
>> David Frascone wrote:
>> > 1) Has anyone seen this behavior before?  If so, do you remember which
>> > functions may be causing it (hg vs git speed under cygwin maybe?)
>> >
>> > 2) Any thoughts on trying to profile a prompt and/or shell script, if
>> > I pull it out of the prompt function
>>
>> Anytime you have to call an external process, you pay a multiplied
>> penalty on cygwin -- 1st linux process spawning, while costly, are
>> less than Windows, and 2) cygwin has to emulate the posix semantics
>> on windows -- to which it is not friendly.  If you could somehow cache
>> recent data in data struct and only updated ever 10 minutes with a
>> live call, that might help...?
>
> Yeah.  If you look in the standard fish_prompt function, it does some of that -
> cacheing calculated outputs that can be expected not to change for the duration
> of a single shell.  My prompt isn't as bad as yours, but there's a noticeable
> lag in Cygwin that's not there in Linux.
>
> Profiling would be a good idea, but I don't know how you do that with a fish
> script.  I suggest asking on the fish-users list.
>
> Good luck,
> Andrew
>
>
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