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From: Ihor Radchenko <yantar92@gmail.com>
To: Eli Zaretskii <eliz@gnu.org>, Andrea Corallo <akrl@sdf.org>
Cc: emacs-devel@gnu.org
Subject: Re: Native compilation: the bird-eye view
Date: Sun, 17 May 2020 12:11:45 +0800	[thread overview]
Message-ID: <87mu67urni.fsf@localhost> (raw)
In-Reply-To: <83ftbzdewp.fsf@gnu.org>

> And for the "non-average" user, who builds Emacs from sources?  AFAIU,
> native compilation of all Lisp files takes many hours even on fast
> machines -- won't this be an annoyance if we don't come up with a JIT
> mechanism?

I am using Gentoo and thus compiling pretty much everything from source.
According to my experience so far, compilation takes even more time than
compiling something like chromium. Moreover, I got memory overflow (for
8Gb RAM) when compiling ja-dic.elc. In order to compile that file, I had
to manually fallback to comp-speed 0. 

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Andrea Corallo <akrl@sdf.org>
>> Date: Sat, 16 May 2020 12:58:11 +0000
>> Cc: emacs-devel@gnu.org
>> 
>> > If so, they will have
>> > to be generated on the end-user machines, or perhaps by whoever
>> > prepares the Emacs binary distributions -- assuming that the binary
>> > distributions are sufficiently compatible to allow that,
>> > notwithstanding the differences between the system where the *.eln
>> > files were generated and the system where they will be installed and
>> > used.  (I don't know what is the granularity of the binary distros wrt
>> > machine architecture and OS versions -- will that allow to be sure the
>> > *.eln files are compatible with the target system?)
>> 
>> Given .eln are just shareds with (almost) no dependecies [1] their
>> degree of compatibility should be higher then the Emacs binary itself.
>
> Well, the "almost" part means we aren't actually sure about this.
> E.g., what about the dependencies related to the GCC version used to
> build libgccjit and compile the .eln files?
>
>> > The next question is whether we want the *.eln files to exist up front
>> > for all the Lisp files on the end-user system, or we want them to be
>> > generated in JIT-like manner, whenever the corresponding Lisp library
>> > is loaded on demand?  The answer to this question might then influence
>> > the place where the *.eln files are kept -- the JIT alternative would
>> > suggest to have some kind of cache directory where we put the compiled
>> > files, similar to what Guile does.
>> 
>> I suspect that for the average user the best is to have the distribution
>> do all the compilation upfront for him and have deferred compilation
>> handling only additional libraries and packages.
>
> And for the "non-average" user, who builds Emacs from sources?  AFAIU,
> native compilation of all Lisp files takes many hours even on fast
> machines -- won't this be an annoyance if we don't come up with a JIT
> mechanism?
>

-- 
Ihor Radchenko,
PhD,
Center for Advancing Materials Performance from the Nanoscale (CAMP-nano)
State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, China
Email: yantar92@gmail.com, ihor_radchenko@alumni.sutd.edu.sg



  parent reply	other threads:[~2020-05-17  4:11 UTC|newest]

Thread overview: 59+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-16 11:51 Native compilation: the bird-eye view Eli Zaretskii
2020-05-16 12:58 ` Andrea Corallo
2020-05-16 15:57   ` Paul Eggert
2020-05-16 16:26   ` Eli Zaretskii
2020-05-16 17:03     ` Andrea Corallo
2020-05-16 17:35       ` Eli Zaretskii
2020-05-16 17:44         ` Andrea Corallo
2020-05-16 17:50           ` Eli Zaretskii
2020-05-16 18:26             ` Andrea Corallo
2020-05-16 18:32               ` Eli Zaretskii
2020-05-16 18:41                 ` Andrea Corallo
2020-05-18 14:27                   ` Andrea Corallo
2020-05-19  5:08                     ` ASSI
2020-05-19 16:25                     ` Andrea Corallo
2020-05-19 16:37                       ` Stefan Kangas
2020-05-19 19:16                         ` Andrea Corallo
2020-05-29 17:25                       ` Andrea Corallo
2020-06-02 15:16                       ` Stefan Monnier
2020-06-03 14:23                         ` Andrea Corallo
2020-06-03 14:38                           ` Stefan Monnier
2020-08-10  9:23                             ` Andrea Corallo via Emacs development discussions.
2020-08-10 12:20                               ` Stefan Monnier
2020-08-10 21:34                                 ` Andrea Corallo via Emacs development discussions.
2020-08-15 10:51                                   ` Andrea Corallo via Emacs development discussions.
2020-08-15 15:00                                     ` Eli Zaretskii
2020-08-19 15:01                                     ` Andrea Corallo via Emacs development discussions.
2020-08-20  0:53                                       ` tumashu
2020-08-20  8:11                                         ` Andrea Corallo via Emacs development discussions.
2020-08-23 12:19                                       ` Andrea Corallo via Emacs development discussions.
2020-08-23 15:37                                         ` Stefan Monnier
2020-08-23 16:31                                           ` Andrea Corallo via Emacs development discussions.
2020-08-23 18:20                                             ` Stefan Monnier
2020-08-24  8:03                                               ` Andrea Corallo via Emacs development discussions.
2020-08-24 13:31                                                 ` Stefan Monnier
2020-08-24 14:09                                                   ` Andrea Corallo via Emacs development discussions.
2020-08-30 10:18                                             ` Path for system-wide .eln files (was: Native compilation: the bird-eye view) Ulrich Mueller
2020-08-30 20:50                                               ` Path for system-wide .eln files Andrea Corallo via Emacs development discussions.
2020-08-30 21:51                                                 ` Stefan Monnier
2020-08-31 19:13                                                   ` Andrea Corallo via Emacs development discussions.
2020-08-31 21:16                                                     ` Ulrich Mueller
2020-09-01  4:28                                                       ` Yuri Khan
2020-09-01  7:16                                                         ` Ulrich Mueller
2020-09-01  8:46                                                           ` tomas
2020-09-04 17:55                                                           ` Andrea Corallo via Emacs development discussions.
2020-09-04 18:25                                                             ` Ulrich Mueller
2020-09-04 19:47                                                               ` Andrea Corallo via Emacs development discussions.
2020-09-04 20:01                                                                 ` Ulrich Mueller
2020-09-04 21:42                                                                   ` Stefan Monnier
2020-09-04 22:59                                                                     ` Ulrich Mueller
2020-09-05  2:58                                                                       ` Stefan Monnier
2020-09-05  7:10                                                                         ` Ulrich Mueller
2020-09-06  6:24                                                                           ` Andrea Corallo via Emacs development discussions.
2020-09-05  7:48                                                                     ` Alfred M. Szmidt
2020-05-16 19:11               ` Native compilation: the bird-eye view Yuan Fu
2020-05-17  4:04                 ` Ihor Radchenko
2020-05-17 11:18                 ` Arthur Miller
2020-05-16 22:09               ` John Wiegley
2020-05-17  4:11     ` Ihor Radchenko [this message]
2020-05-17  7:43       ` Andrea Corallo

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