[Gdal-dev] Forgetting to Destroy?

[Curt Mills]

On Thu, 11 Dec 2003, Curt Mills wrote:

> On Thu, 11 Dec 2003, Curt Mills wrote:
>
> > On Thu, 11 Dec 2003, Curt Mills, WE7U wrote:
> >
> > > My code is currently reading Shapefile maps via OGR.  If I disable
> > > the feature loop, memory appears relatively stable.
> > >
> > > Enabling the feature loop, I'm losing megabytes every time I read
> > > in Shapefiles.
> >
> > More data:  Tried the same thing with SDTS DLG file.  First file
> > load takes me from 10588 kbytes to 14508 kbytes, then it stays
> > stable as I pan/zoom (which reads the file in again), actually
> > dropping slightly to around 14476 kbytes.
> >
> > With Shapefiles, the memory just keeps climbing each time I load a
> > file.  A lot.
>
> Yet more:  Point/Polylines don't appear to trigger it.  Happens with
> Polygon and perhaps MultiPolygon files.

Yet another datapoint:  My first SDTS test file only contained
Points/Polylines, which did not trigger the memory loss.  SDTS files
which contain Polygons _do_ trigger it.  Shapefile Multipolygons
also definitely trigger it.

I'm losing memory with these map formats so far:

    SDTS Polygons
    Shapefile Polygons
    Shapefile MultiPolygons

Everything appears ok with only Points/Polylines from the few
formats I've tried.

This is with my "feature" loop essentially disabled:  Get each new
feature, and then destroy it.

If I disable even that part of the loop and leave only the layer
loop, memory usage becomes stable.  If I use files containing only
Points/Lines, memory usage becomes stable.

-- 
Curt Mills, WE7U                    hacker_NO_SPAM_ at tc.fluke.com
Senior Methods Engineer/SysAdmin
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