[jira] [Resolved] (IMPALA-3553) LLVM CodeGen performanc​e reduced

[Tim Armstrong (JIRA)]

     [ 
https://issues.apache.org/jira/browse/IMPALA-3553?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Tim Armstrong resolved IMPALA-3553.
-----------------------------------
    Resolution: Cannot Reproduce

> LLVM CodeGen performanc​e reduced
> ---------------------------------
>
>                 Key: IMPALA-3553
>                 URL: https://issues.apache.org/jira/browse/IMPALA-3553
>             Project: IMPALA
>          Issue Type: Bug
>          Components: Backend
>    Affects Versions: Impala 2.0, Impala 2.2
>            Reporter: seven chen
>            Priority: Minor
>         Attachments: profile.jpg, report.rar
>
>
> when impala running about 3 months,the same sql will become slowly.
> According to the profile,i see the compile_timer_ take about 2m32s.
> The code detail is below.
>   SCOPED_TIMER(compile_timer_);
>   // JIT compile all codegen'd functions
>   for (int i = 0; i < fns_to_jit_compile_.size(); ++i) {
>     *fns_to_jit_compile_[i].second = 
> JitFunction(fns_to_jit_compile_[i].first);
>   }
> If reboot the impala,CodeGen performance will normal.



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