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From: Eric Abrahamsen <eric@ericabrahamsen.net>
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Subject: Re: Trimming .gnus.registry.eieio?
Date: Tue, 19 Feb 2019 17:13:06 -0800
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Norman Walsh <ndw@nwalsh.com> writes:

> Eric Abrahamsen <eric@ericabrahamsen.net> writes:
>> Theoretically, reducing `gnus-registry-max-entries' is what you do to
>> trim it back! What's your value of `gnus-registry-track-extra'? That
>> might contribute to a larger file size.
>
> The relevant settings appear to be:
>
> (setq gnus-registry-max-entries          20000
>       gnus-registry-split-strategy       nil
>       gnus-registry-use-long-group-names t
>       gnus-registry-track-extra          '(recipient))
>
> I’m reasonably sure that gnus-registry-split-fancy-with-parent is the
> only thing I’m using it for. Not sure why I put ‘recipient’ in there.

Well if you're using it for splitting then you probably do want to keep
a slightly larger registry, you never know when you'll get a followup to
an existing message. You can also use `gnus-registry-ignored-groups' to
restrict entry collection to groups you care about.