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bug#40704: 28.0.50; Improve and speed up (Gnus) registry saving
From: |
Michael Heerdegen |
Subject: |
bug#40704: 28.0.50; Improve and speed up (Gnus) registry saving |
Date: |
Sun, 19 Jul 2020 16:52:29 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) |
Lars Ingebrigtsen <larsi@gnus.org> writes:
> > + (princ "#s(hash-table size ")
> > + (prin1 (hash-table-size thing))
> > + (princ " test ")
> > + (prin1 (hash-table-test thing))
> > + (princ " weakness ")
> > + (prin1 (hash-table-weakness thing))
> > + (princ " rehash-size ")
>
> etc
>
> So if the other printer changes, then this has to change, too? That
> seems kinda brittle -- there should at least be references between the
> two printers with a note to keep them updated if one of them changes.
What do you mean, "other printer"? The Lisp printer?
This read syntax is officially described in the Elisp manual:
(info "(elisp) Creating Hash")
(near the end of the page), so I would expect that the syntax will be
supported in the future.
> > diff --git a/lisp/gnus/gnus-registry.el b/lisp/gnus/gnus-registry.el
> > index 480ed80ef8..4ac3c84a80 100644
> > --- a/lisp/gnus/gnus-registry.el
> > +++ b/lisp/gnus/gnus-registry.el
> > @@ -398,6 +398,7 @@ gnus-registry-save
> > (interactive)
> > (let* ((file (or file gnus-registry-cache-file))
> > (db (or db gnus-registry-db))
> > + (gc-cons-threshold (max gc-cons-threshold (* 800000 500)))
> > (clone (clone db)))
> > (gnus-message 5 "Saving Gnus registry (%d entries) to %s..."
> > (registry-size db) file)
>
> Could this have adverse consequences for people with low memory?
These are 400 MB... Could be? Dunno. I wonder, though, if when you
would hit that limit when that code runs, your computer can hold that
huge hash-table at all. I don't know the relation between hash-table
size and corresponding amount of garbage. But I guess if you are low on
memory using the registry is problematic per se.
Michael.