[PATCH 1 of 4 lazy-manifest v2] manifest.c: new extension code to lazily parse manifests

[Martin von Zweigbergk]

 On Tue, Jan 13, 2015, 18:11 Augie Fackler <raf at durin42.com> wrote:


On Jan 13, 2015, at 7:42 PM, Martin von Zweigbergk <martinvonz at google.com>
wrote:

> As I reported on IRC, the 'setitem' method seems slow. On the Mozilla
repo, running
>
>   hg co -C 1813b && hg mv -q intl i18n && time hg ci -qm 'move intl'
>
> takes 6.3s with current hg and 1m21s with these patches applied. It may
very be related to your TODO in setitem.

Yeah, I think this is the point where we should drop v2, and I’ll work on a
bulk-add function (shouldn’t take long) to mitigate that problem.



 I think I once suggested making it transparent to the user by instead
storing modifications separately and then compacting them on any query
operation. That should effectively be the same (performance-wise) as an
explicit bulk update operation, but without the need to update any callers.
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