[jira] [Commented] (ARROW-3491) [C++] Experiment with split DWARF

["Antoine Pitrou (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-3491?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16646446#comment-16646446 ] 

Antoine Pitrou commented on ARROW-3491:
---------------------------------------

Running some timings here (Ubuntu 18.04, gcc 7.3.0), on the ARROW-3442 branch:
* cold debug build (ccache flushed) without split DWARF:
{code}
real	1m43,742s
user	11m4,532s
sys	0m46,878s
{code}
* cold debug build (ccache flushed) with split DWARF:
{code}
real	1m44,847s
user	11m17,830s
sys	0m48,983s
{code}

So there doesn't seem to be an improvement in full build time. As for the disk footprint:
* without split DWARF:
{code}
$ du -h --max-depth=1 build-test/
272M	build-test/debug
696K	build-test/double-conversion_ep
27M	build-test/double-conversion_ep-prefix
256K	build-test/CMakeFiles
321M	build-test/src
20K	build-test/tools
24K	build-test/examples
116M	build-test/jemalloc_ep-prefix
737M	build-test/
{code}
* with split DWARF:
{code}
$ du -h --max-depth=1 build-test/
198M	build-test/debug
492K	build-test/double-conversion_ep
27M	build-test/double-conversion_ep-prefix
260K	build-test/CMakeFiles
312M	build-test/src
20K	build-test/tools
24K	build-test/examples
116M	build-test/jemalloc_ep-prefix
654M	build-test/
{code}


> [C++] Experiment with split DWARF
> ---------------------------------
>
>                 Key: ARROW-3491
>                 URL: https://issues.apache.org/jira/browse/ARROW-3491
>             Project: Apache Arrow
>          Issue Type: Wish
>          Components: C++
>            Reporter: Antoine Pitrou
>            Priority: Minor
>
> From the article at http://www.productive-cpp.com/improving-cpp-builds-with-split-dwarf/, it should be possible to split debug information from .o files to have faster C++ builds and smaller disk footprint of libraries / executables. This is useful for development builds.



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