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https://issues.apache.org/jira/browse/LUCENE-9928?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Muir resolved LUCENE-9928.
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    Fix Version/s: main (9.0)
       Resolution: Fixed

> speed up analysis/icu regeneration
> ----------------------------------
>
>                 Key: LUCENE-9928
>                 URL: https://issues.apache.org/jira/browse/LUCENE-9928
>             Project: Lucene - Core
>          Issue Type: Task
>            Reporter: Robert Muir
>            Priority: Major
>             Fix For: main (9.0)
>
>          Time Spent: 1h 40m
>  Remaining Estimate: 0h
>
> This is relatively slow, on linux/mac we have to compile the icu4c library 
> and then use the built tools to do the regeneration. Especially the 
> compilation of the large library is currently slow.
> Let's make it a little less painful, e.g. use {{-O0}} as optimization isn't 
> helpful and slows it down (its a throwaway method to get correctly versioned 
> tools and run them once).
> Before:
> {noformat}
> > Task :lucene:analysis:icu:regenerate
> Aggregate task times (possibly running in parallel!):
>  160.78 sec.  compileIcuLinux
>   15.09 sec.  compileJava
>    1.51 sec.  genUtr30DataFiles
>    1.49 sec.  jar
>    0.79 sec.  genRbbi
>    0.57 sec.  gitStatus
>    0.25 sec.  compileToolsJava
>    0.16 sec.  processResources
>    0.04 sec.  genRbbiChecksumLoad
>    0.02 sec.  genRbbiChecksumSave
>    0.01 sec.  genUtr30DataFilesChecksumLoad
>    0.01 sec.  genUtr30DataFilesChecksumSave
>    0.00 sec.  genUtr30DataFilesIfChanged
>    0.00 sec.  genRbbiIfChanged
>    0.00 sec.  errorProneSkipped
> {noformat}
> After:
> {noformat}
> > Task :lucene:analysis:icu:regenerate
> Aggregate task times (possibly running in parallel!):
>  126.86 sec.  compileIcuLinux
>   15.78 sec.  compileJava
>    1.57 sec.  jar
>    1.35 sec.  genUtr30DataFiles
>    0.81 sec.  genRbbi
>    0.60 sec.  gitStatus
>    0.24 sec.  compileToolsJava
>    0.15 sec.  processResources
>    0.04 sec.  genRbbiChecksumLoad
>    0.02 sec.  genRbbiChecksumSave
>    0.01 sec.  genUtr30DataFilesChecksumLoad
>    0.00 sec.  genUtr30DataFilesChecksumSave
>    0.00 sec.  genRbbiIfChanged
>    0.00 sec.  genUtr30DataFilesIfChanged
>    0.00 sec.  errorProneSkipped
> {noformat}



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