[R] Save creates huge files, dump doesn't

William Dunlap wdun|@p @end|ng |rom t|bco@com
Tue Feb 19 21:30:01 CET 2019

One reason save() makes bigger files than dump() is that save() saves
environments associated with functions that are saved and those
environments may contain large datasets that are not really needed.

Bill Dunlap
TIBCO Software
wdunlap tibco.com

On Tue, Feb 19, 2019 at 11:59 AM Jeff Newmiller <jdnewmil using dcn.davis.ca.us>

> Make a reproducible example that focuses on the save/load aspect of the
> size problem. You may need to experiment with which variables need to be in
> the save file in order to trigger the behavior. Your example might have to
> involve sending us a link to a large file, but that size may dissuade busy
> experts from tackling it so paring it down by experimentation could be in
> your best interest.
> There is some expected behavior that can lead to larger files than the
> original in-memory data, but offhand I am unaware of any explanation for
> those files then using less space when re-loaded into memory than they
> occupy on disk.
> On February 18, 2019 11:51:11 AM PST, Lars Velten <lars.velten using embl.de>
> wrote:
> >Dear list,
> >I noticed an extremely odd behavior... I have a rather complex shiny
> >app which allows the user to store his/her state which internally
> >obviously triggers as call to save as follows
> >save(list=c("plots","gates","populations","cg",
> >"genelists","colorscores",  "proj", "actds"),file=fname)
> >this was all working fine until some time ago (?!?) files created by
> >this command became several hundred MBs big... even thought the
> >cumulative size of all objects in memory after load() is in the 10s of
> >kB.
> >Changing to
> >dump(list=c("plots","gates","populations","cg",
> >"genelists","colorscores",  "proj", "actds"),file=fname)
> >solved the problem, output was then only 10s of kB.
> >(Why/when) is this behavior intended?
> >Best wishes,
> >Lars
> >
> >       [[alternative HTML version deleted]]
> >
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