Mercurial > hg
view tests/test-debugextensions.t @ 38893:23d582caae30
changegroup: capture revision delta in a data structure
The current changegroup generation code is tightly coupled to
the revlog API. This tight coupling makes it difficult to implement
alternate storage backends without requiring a large surface area
of the revlog API to be exposed. This is not desirable.
In order to support changegroup generation with non-revlog storage,
we'll need to abstract the concept of delta generation.
This commit is the first step down that road. We introduce a
data structure for representing a delta in a changegroup.
The API still leaves a lot to be desired. But at least we now
have separation between data and actions performed on it.
As part of this, we tweak behavior slightly: we no longer
concatenate the delta prefix with the metadata header. Instead,
we track and emit the prefix as a separate chunk. This shouldn't
have any meaningful impact since all the chunks just get sent to
the wire, the compressor, etc.
Because we're introducing a new object, this does add some
overhead to changegroup execution. `hg perfchangegroupchangelog`
on my clone of the Mercurial repo (~40,000 visible revisions in
the changelog) slows down a bit:
! wall 1.268600 comb 1.270000 user 1.270000 sys 0.000000 (best of 8)
! wall 1.419479 comb 1.410000 user 1.410000 sys 0.000000 (best of 8)
With for `hg bundle -t none-v2 -a /dev/null`:
before: real 6.610 secs (user 6.460+0.000 sys 0.140+0.000)
after: real 7.210 secs (user 7.060+0.000 sys 0.140+0.000)
I plan to claw back this regression in future commits. And I may
even do away with this data structure once the refactor is complete.
For now, it makes things easier to comprehend.
Differential Revision: https://phab.mercurial-scm.org/D4075
author | Gregory Szorc <gregory.szorc@gmail.com> |
---|---|
date | Fri, 03 Aug 2018 10:05:26 -0700 |
parents | 4e6a6d0dccee |
children | 4836705ab9ba |
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#if no-extraextensions $ hg debugextensions #endif $ debugpath=`pwd`/extwithoutinfos.py $ cat > extwithoutinfos.py <<EOF > EOF $ cat > extwithinfos.py <<EOF > testedwith = b'3.0 3.1 3.2.1' > buglink = b'https://example.org/bts' > EOF $ cat >> $HGRCPATH <<EOF > [extensions] > histedit= > patchbomb= > rebase= > mq= > ext1 = $debugpath > ext2 = `pwd`/extwithinfos.py > EOF $ for extension in $HGTESTEXTRAEXTENSIONS; do > echo "$extension=!" >> $HGRCPATH > done $ hg debugextensions ext1 (untested!) ext2 (3.2.1!) histedit mq patchbomb rebase $ hg debugextensions -v ext1 location: */extwithoutinfos.py* (glob) bundled: no ext2 location: */extwithinfos.py* (glob) bundled: no tested with: 3.0 3.1 3.2.1 bug reporting: https://example.org/bts histedit location: */hgext/histedit.py* (glob) bundled: yes mq location: */hgext/mq.py* (glob) bundled: yes patchbomb location: */hgext/patchbomb.py* (glob) bundled: yes rebase location: */hgext/rebase.py* (glob) bundled: yes $ hg debugextensions -Tjson | sed 's|\\\\|/|g' [ { "buglink": "", "bundled": false, "name": "ext1", "source": "*/extwithoutinfos.py*", (glob) "testedwith": [] }, { "buglink": "https://example.org/bts", "bundled": false, "name": "ext2", "source": "*/extwithinfos.py*", (glob) "testedwith": ["3.0", "3.1", "3.2.1"] }, { "buglink": "", "bundled": true, "name": "histedit", "source": "*/hgext/histedit.py*", (glob) "testedwith": [] }, { "buglink": "", "bundled": true, "name": "mq", "source": "*/hgext/mq.py*", (glob) "testedwith": [] }, { "buglink": "", "bundled": true, "name": "patchbomb", "source": "*/hgext/patchbomb.py*", (glob) "testedwith": [] }, { "buglink": "", "bundled": true, "name": "rebase", "source": "*/hgext/rebase.py*", (glob) "testedwith": [] } ] $ hg debugextensions -T '{ifcontains("3.1", testedwith, "{name}\n")}' ext2 $ hg debugextensions \ > -T '{ifcontains("3.2", testedwith, "no substring match: {name}\n")}'