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From "Shikhar Bhushan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (IVY-1465) ModuleRules.getRule is O(n) leading to resolution slowness
Date Fri, 18 Apr 2014 19:41:17 GMT

    [ https://issues.apache.org/jira/browse/IVY-1465?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13974398#comment-13974398
] 

Shikhar Bhushan commented on IVY-1465:
--------------------------------------

> It seems the Solr/Lucene POM's don't specify versions of their dependencies, which may
be a factor here.

Not true, the versions just live in a grandparent POM. I don't know how well Ivy handles transitive
resolution involving parent/grandparent POM's.

see: http://search.maven.org/remotecontent?filepath=org/apache/lucene/lucene-solr-grandparent/4.7.0/lucene-solr-grandparent-4.7.0.pom

> ModuleRules.getRule is O(n) leading to resolution slowness
> ----------------------------------------------------------
>
>                 Key: IVY-1465
>                 URL: https://issues.apache.org/jira/browse/IVY-1465
>             Project: Ivy
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 2.3.0
>         Environment: OpenJDK 6,7, MacOSX + Ubuntu
>            Reporter: Joshua Suereth
>            Priority: Minor
>              Labels: performance
>
> So, for the sbt project we noticed significant resolution time improvements with the
following patch:
> https://github.com/sbt/ivy/pull/1
> The reasoning:
> A lot of artifacts being resolved use Maven's "dependencyManagement" conventions
> Ivy appears to turn these into "exact matcher" rules
> A ton of resolution time is spent filtering through these rules
> The existing solution is O(n) for all overrides
> What the patch does:
> Creates a key'd store for all "exact matcher" rules
> When executing rules, ensure that we only traverse what we have to (non-exact, exact
specific to our key and "default").
> As I said, this represents a significant speed bump for sbt builds using Ivy.  All existing
tests pass, and I think they cover this aspect of ivy pretty well, from what I could see.



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