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https://issues.apache.org/jira/browse/GROOVY-10454?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17577685#comment-17577685
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Eric Milles edited comment on GROOVY-10454 at 8/10/22 12:47 AM:
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As far as parrot performance, it is still not optimized like the old parser but
there are some settings that you can experiment with to trade memory or threads
for parse time.
was (Author: emilles):
As far as parrot performance, it is still not optimized like the old parser but
there are some settings that you can experiment to trade memory or threads for
parse time.
> Performance issue with "Parrot" parser in Groovy 3.x
> ----------------------------------------------------
>
> Key: GROOVY-10454
> URL: https://issues.apache.org/jira/browse/GROOVY-10454
> Project: Groovy
> Issue Type: Bug
> Components: parser-antlr4
> Affects Versions: 3.0.9
> Environment: OpenJdk on Windows & Linux
> Reporter: Rainer Podlas
> Priority: Major
>
> We have recently upgraded from Groovy 2.4.3 to Groovy 3.0.9 and are now
> facing a big performance issue when loading/parsing our Groovy sources.
> In one concrete example we talk about 60 Groovy source files. Loading them
> with Groovy 2.4.3 takes < 40 seconds, whereas loading the same sources with
> Groovy 3.0.9 takes twice the time (~1:20). In another example we notice
> increased parsing duration from ~ 1,5 minutes to 3 minutes, again a doubling
> of the duration.
> In the release notes I read about the new "Parrot" parser, and indeed, once I
> disable it via "{*}groovy.antlr4=false{*}" the parsing duration is "back to
> normal".
> That means for now we have a workaround, but as the new "Parrot" parser is
> going to be the one and only in Groovy 4.x we will be facing a problem in the
> near future ;-(
> Is this performance drop a known issue? I could not find any related tickets?
> Please note that we are loading the Groovy sources via the
> "{*}groovy.lang.GroovyClassLoader{*}" and the method call:
> "{*}loadClass(path, true, false, true);{*}"
> Looking forward to receiving feedback on that.
> Thank you very much!
> Kind regards, Rainer
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