Mercurial > hg
view tests/test-sparse-requirement.t @ 39178:274acf379dbb
setdiscovery: precompute children revisions to avoid quadratic lookup
Moving away from dagutil a few commits ago introduced quadratic
behavior when resolving children revisions during discovery.
This commit introduces a precompute step of the children revisions
to avoid the bad behavior.
I believe the new code should have near identical performance to
what dagutil was doing before. Behavior is still slightly different
because we take into account filtered revisions. But this change was
made when we moved off dagutil.
I added a comment about multiple invocations of this function
redundantly calculating the children revisions. I believe this
potentially undesirable behavior was present when we used dagutil,
as the call to inverse() previously in this function created a new
object and required computing children on every invocation. I thought
we should document the potential for a performance issue rather than
let it go undocumented.
Differential Revision: https://phab.mercurial-scm.org/D4326
author | Gregory Szorc <gregory.szorc@gmail.com> |
---|---|
date | Fri, 17 Aug 2018 19:35:24 +0000 |
parents | c2c8962a9465 |
children | 74a519c86625 |
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$ hg init repo $ cd repo $ touch a.html b.html c.py d.py $ cat > frontend.sparse << EOF > [include] > *.html > EOF $ hg -q commit -A -m initial $ echo 1 > a.html $ echo 1 > c.py $ hg commit -m 'commit 1' Enable sparse profile $ cat .hg/requires dotencode fncache generaldelta revlogv1 store testonly-simplestore (reposimplestore !) $ hg debugsparse --config extensions.sparse= --enable-profile frontend.sparse $ ls a.html b.html Requirement for sparse added when sparse is enabled $ cat .hg/requires dotencode exp-sparse fncache generaldelta revlogv1 store testonly-simplestore (reposimplestore !) Client without sparse enabled reacts properly $ hg files abort: repository is using sparse feature but sparse is not enabled; enable the "sparse" extensions to access! [255] Requirement for sparse is removed when sparse is disabled $ hg debugsparse --reset --config extensions.sparse= $ cat .hg/requires dotencode fncache generaldelta revlogv1 store testonly-simplestore (reposimplestore !) And client without sparse can access $ hg files a.html b.html c.py d.py frontend.sparse