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Re: Loading tramp for dump goes into infinite regress
From: |
Eli Zaretskii |
Subject: |
Re: Loading tramp for dump goes into infinite regress |
Date: |
Mon, 25 Jul 2022 16:56:06 +0300 |
> From: Lynn Winebarger <owinebar@gmail.com>
> Date: Mon, 25 Jul 2022 08:49:27 -0400
> Cc: michael.albinus@gmx.de, emacs-devel <emacs-devel@gnu.org>
>
> > > it seems like something undesirable is going on between dumping and
> > > the native compilation unit.
> >
> > I find this hard to believe.
>
> If I can recreate it in a more direct way on my personal machines, I'll put
> in a bug with details including the
> required modifications to tramp.el (to remove the problematic require of
> tramp-loaddefs).
Please do.
> > Btw, you are aware that dumping *.eln files basically dumps just their
> > names, not their code? And that, when you start Emacs after dumping,
> > it will load all of those *.eln files one by one, which takes time
> > (*.eln files are just shared libraries, like *.so files), and use up
> > shared-library and handle slots of the Emacs process? So I'm not even
> > sure doing this would make sense from the performance POV: it could be
> > that startup will slower, not faster.
>
> I am aware that dumping the eln files produces an indirection to the shared
> library, but not the details of the
> implementation.
> I would expect (or at least hope) that the effect of the evaluation that is
> done on loading to be stored in the
> dump and for the shared libraries to get loaded into the process without
> repeating the evaluation. So things
> like the order of customization groups should be fixed.
It depends on the top-level forms of the package, and what they do.
If they change values of variables, those values will be dumped, yes.
> I would also expect that whatever the effect is on the emacs process with
> .eln files loaded by the dumped
> file, it is no worse than it would be if loaded as part of my .emacs file.
How is this different from the previous expectation of yours?
> Another benefit I expect from native-compilation, dumped or not, is more
> efficient memory use when running
> multiple emacs processes. With dumping, I would expect (or hope for) better
> garbage collector behavior
> since the amount of allocation required for the loaded modules should be
> pre-determined (whether byte- or
> native-compiled). If the image is 300MB (including the shared libraries), so
> be it, as long as the memory is
> shared between multiple processes.
I don't think I understand this expectation, and I don't think
natively-compiled code has any advantages wrt GC over the
byte-compiled code.
> I'd also like a baseline expectation of performance with native-compiled
> libraries in the dumped image.
What kind of performance?
> > In any case, I'd suggest to get this working with *.elc files in a
> > build without native compilation support, before you try it with
> > native compilation.
>
> First I'll see if I can get the ordering straightened out with just the core
> emacs files required by these
> packages, then do a test between byte-compiled and native-compiled on those.
I'm saying that your job could be easier if you did the first step
with byte-compiled files.
- Re: Loading tramp for dump goes into infinite regress, (continued)
- Re: Loading tramp for dump goes into infinite regress, Eli Zaretskii, 2022/07/24
- Re: Loading tramp for dump goes into infinite regress, Lynn Winebarger, 2022/07/24
- Re: Loading tramp for dump goes into infinite regress, Eli Zaretskii, 2022/07/24
- Re: Loading tramp for dump goes into infinite regress, Lynn Winebarger, 2022/07/24
- Re: Loading tramp for dump goes into infinite regress, Eli Zaretskii, 2022/07/24
- Re: Loading tramp for dump goes into infinite regress, Lynn Winebarger, 2022/07/24
- Re: Loading tramp for dump goes into infinite regress, Lynn Winebarger, 2022/07/24
- Re: Loading tramp for dump goes into infinite regress, Lynn Winebarger, 2022/07/24
- Re: Loading tramp for dump goes into infinite regress, Eli Zaretskii, 2022/07/24
- Re: Loading tramp for dump goes into infinite regress, Lynn Winebarger, 2022/07/25
- Re: Loading tramp for dump goes into infinite regress,
Eli Zaretskii <=
- Re: Loading tramp for dump goes into infinite regress, Lynn Winebarger, 2022/07/26
- Re: Loading tramp for dump goes into infinite regress, Lynn Winebarger, 2022/07/26
- Re: Loading tramp for dump goes into infinite regress, Lynn Winebarger, 2022/07/26
- Re: Loading tramp for dump goes into infinite regress, Lynn Winebarger, 2022/07/27
- Re: Loading tramp for dump goes into infinite regress, Stefan Monnier, 2022/07/25
- Re: Loading tramp for dump goes into infinite regress, Stefan Monnier, 2022/07/25
- Re: Loading tramp for dump goes into infinite regress, Lynn Winebarger, 2022/07/25
- Re: Loading tramp for dump goes into infinite regress, Lynn Winebarger, 2022/07/25
- Re: Loading tramp for dump goes into infinite regress, Andrea Corallo, 2022/07/25
- Re: Loading tramp for dump goes into infinite regress, Lynn Winebarger, 2022/07/31