[jira] [Resolved] (IMPALA-11110) Enable basic optimizations for debug builds

["Joe McDonnell (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IMPALA-11110?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Joe McDonnell resolved IMPALA-11110.
------------------------------------
    Fix Version/s: Impala 4.1.0
       Resolution: Fixed

> Enable basic optimizations for debug builds
> -------------------------------------------
>
>                 Key: IMPALA-11110
>                 URL: https://issues.apache.org/jira/browse/IMPALA-11110
>             Project: IMPALA
>          Issue Type: Improvement
>          Components: Infrastructure
>    Affects Versions: Impala 4.1.0
>            Reporter: Joe McDonnell
>            Assignee: Joe McDonnell
>            Priority: Major
>             Fix For: Impala 4.1.0
>
>
> Currently, Impala debug builds use no optimizations. Some optimizations can interfere with debuggability, and the debug builds prioritize debuggability. However, running without optimizations means the binary is much slower.
> GCC has a debug-friendly optimization level -Og, which enables optimizations that do not interfere with debugging. This may provide a way to get the debuggability needed while having faster runtimes. See [https://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html]
> In testing this, the binaries are definitely faster. Core test runtimes are reduced by about 25 minutes. Exhaustive test runtimes are reduced by over an hour.
> The extra optimization enables compiler passes that produce more debugging information. This means that the binaries have more debug info, which make them larger. This extra information is likely related to variable tracking (i.e. fvar-tracking-assignments), which is recommended for maximum debuggability (but may not be strictly necessary for how we use it). See [https://gcc.gnu.org/onlinedocs/gcc/Debugging-Options.html]
> {noformat}
> Binary size for impalad (unstripped)
> Without -Og: 519345880
> With -Og: 709527368
> Binary size for impalad (stripped)
> Without -Og: 164500024
> With -Og: 105873184{noformat}



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