[jira] [Commented] (IMPALA-11459) Upgrade llvm to a more recent version

["Michael Smith (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/IMPALA-11459?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17748357#comment-17748357 ] 

Michael Smith commented on IMPALA-11459:
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Any time we look at upgrading to LLVM 12, we see significant performance regressions in the perf-AB-test, such as [https://jenkins.impala.io/job/perf-AB-test/.|https://jenkins.impala.io/job/perf-AB-test/]

One idea to explore is recreating the LLVM 5 optimization pass pipeline produced from [buildPerModuleDefaultPipeline|https://github.com/llvm/llvm-project/blob/llvmorg-5.0.1/llvm/lib/Passes/PassBuilder.cpp#L771] and see if that produces better results. It's not clear to me whether the collection and order of passes changed, or if they're implementation or something external changed. Some detailed analysis is needed.

> Upgrade llvm to a more recent version
> -------------------------------------
>
>                 Key: IMPALA-11459
>                 URL: https://issues.apache.org/jira/browse/IMPALA-11459
>             Project: IMPALA
>          Issue Type: Improvement
>            Reporter: Abhishek Rawat
>            Assignee: Michael Smith
>            Priority: Major
>
> We are currently using llvm version 5. llvm 14 is the latest released version. There is scope for utilizing improved optimization passes and other improvements that come with the newer versions. We should look into upgrading llvm to a more recent version.



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