[jira] [Assigned] (ARROW-15730) [R] Memory usage in R blows up

["Will Jones (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-15730?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Will Jones reassigned ARROW-15730:
----------------------------------

    Assignee: Will Jones

> [R] Memory usage in R blows up
> ------------------------------
>
>                 Key: ARROW-15730
>                 URL: https://issues.apache.org/jira/browse/ARROW-15730
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: R
>            Reporter: Christian
>            Assignee: Will Jones
>            Priority: Major
>             Fix For: 6.0.1
>
>         Attachments: image-2022-02-19-09-05-32-278.png
>
>
> Hi,
> I'm trying to load a ~10gb arrow file into R (under Windows)
> _(The file is generated in the 6.0.1 arrow version under Linux)._
> For whatever reason the memory usage blows up to ~110-120gb (in a fresh and empty R instance).
> The weird thing is that when deleting the object again and running a gc() the memory usage goes down to 90gb only. The delta of ~20-30gb is what I would have expected the dataframe to use up in memory (and that's also approx. what was used - in total during the load - when running the old arrow version of 0.15.1. And it is also what R shows me when just printing the object size.)
> The commands I'm running are simply:
> options(arrow.use_threads=FALSE);
> arrow::set_cpu_count(1); # need this - otherwise it freezes under windows
> arrow::read_arrow('file.arrow5')
> Is arrow reserving some resources in the background and not giving them up again? Are there some settings I need to change for this?
> Is this something that is known and fixed in a newer version?
> *Note* that this doesn't happen in Linux. There all the resources are freed up when calling the gc() function - not sure if it matters but there I also don't need to set the cpu count to 1.
> Any help would be appreciated.



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