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https://issues.apache.org/jira/browse/GROOVY-9785?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Paul King closed GROOVY-9785.
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> Performance degradation of groovysh for long scripts
> ----------------------------------------------------
>
> Key: GROOVY-9785
> URL: https://issues.apache.org/jira/browse/GROOVY-9785
> Project: Groovy
> Issue Type: Bug
> Components: Groovysh, parser-antlr4
> Affects Versions: 3.0.6
> Reporter: Stephen Mallette
> Assignee: Eric Milles
> Priority: Major
> Attachments: groovy-2.5.13.jfr, groovy-3.0.6.jfr,
> test-groovysh-incomplete-multiline.groovy
>
>
> This issue was initially raised on the groovy-users mailing list
> ([here|https://lists.apache.org/thread.html/rb3ccd13570642038e822bd3e430999e0f5f430543edfdae92e895c0f%40%3Cusers.groovy.apache.org%3E]).
> The general issue is that long scripts pasted to groovysh in 3.x are
> parsed/read much more slowly than prior 2.x versions. From the mailing list:
> {code}
> groovy:000> start = System.currentTimeMillis()
> ===> 1603105239050
> groovy:000> 1 + 10 +
> groovy:001> 1 + 10 +
> groovy:002> 1 + 10 +
> groovy:003> 1 + 10 +
> groovy:004> 1 + 10 +
> groovy:005> 1 + 10 +
> groovy:006> 1 + 10 +
> ...
> groovy:495> 1 + 10 +
> groovy:496> 1 + 10 +
> groovy:497> 1 + 10
> ===> 5478
> groovy:000> System.currentTimeMillis() - start
> ===> 1193
> and on 3.0.6 I got:
> groovy:000> start = System.currentTimeMillis()
> ===> 1603105244825
> groovy:000> 1 + 10 +
> groovy:001> 1 + 10 +
> groovy:002> 1 + 10 +
> groovy:003> 1 + 10 +
> groovy:004> 1 + 10 +
> groovy:005> 1 + 10 +
> groovy:006> 1 + 10 +
> ...
> groovy:495> 1 + 10 +
> groovy:496> 1 + 10 +
> groovy:497> 1 + 10
> ===> 5478
> groovy:000> System.currentTimeMillis() - start
> ===> 31876
> {code}
> Note that JFRs are attached - perhaps they will shed some light on what is
> happening to someone familiar with the code.
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