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Re: Why is Elisp slow?


From: 조성빈
Subject: Re: Why is Elisp slow?
Date: Tue, 7 May 2019 05:41:24 +0900


> 2019. 5. 7. 오전 5:23, Ergus <address@hidden> 작성:
> 
> 
> 
> On May 6, 2019 8:47:12 PM GMT+02:00, Stefan Monnier <address@hidden> wrote:
>>>> [ IIUC of the 4 cases above, at most 2 run the same version, so we'd
>>>> need to make sure the same Emacs version can be compiled against
>> all
>>>> of those versions.  No idea if it would impose a significant extra
>>>> burden or not, but it's something to be considered.  Also the fact
>>>> that the latest release doesn't work on all those platforms is
>> rather
>>>> worrying.  ]
>>> 
>>> Hmm…? I can’t understand :-(
>>> Why can’t Emacs can include a specific version of SBCL’s source (e.g.
>> as
>>> a git module) and compile them all together?̊̈
>> 
>> Exactly because the version that can run on ARM is not the same as the
>> one that can run under Windows, which is not the same as the one that
>> runs under AMD64.
>> 
>> Of course, maybe I'm confused by the table of available binaries (at
>> http://sbcl.org/platform-table.html), and in reality the latest version
>> works fine on all supported platforms.
>> 
>> 
>>       Stefan
> 
> What about just ask to sbcl maintainers about portability? On the other hand, 
> if Emacs doesn't use extremely fancy stuff in the language we could just rely 
> on the system's sbcl version (available in the distro), for gnu/linux systems 
> that will be pretty fine and of course that's something that needs specific 
> tests. But nothing compared to maintain a compiler. 
> 
> Stefan if you need to test sbcl in some specific (weird) architecture just 
> send/tell me the tests and the architectured you need to test. (Except 
> windows)  and I can do that.
> 
> Btw. Should we move this thread to the developers list? (and start the usual 
> war)
> 
> Please don't go for JS stuff... Please... performance is terrible even with 
> jit.
> 

Um… JS’s performance is pretty good, almost comparable with static languages 
like Java and C.
I remember a better benchmark, but I couldn’t find that, but look at this: 
https://attractivechaos.github.io/plb/ <https://attractivechaos.github.io/plb/>
Javascript V8 engine is almost always in about x2 ~ x3 of C.
Compare that to Elisp….uh…which is about comparable with python maybe?



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