Re: [OpenMap Users] Is CsvTiledImagePlugIn so demanding on memory ?

From: Mirek Pawlowski <mirek.pawlowski_at_ctm.gdynia.pl>
Date: Thu, 1 Sep 2005 07:15:14 +0200

Hi Don,

I checked CsvTiledImagePlugIn only with 1 image. Its data is below.
  scale 1:7000
  resolution 96X96 pixel/inch
  hight:width 3147:1458
  size 84KB

csv description:
54.546,18.50167,54.528167,18.568,file:///E:/HOME/image/gdynia7000_G.png

Resolution of my display device is 1280x1024.

Now my application without that image occupies about 20MB but after
loading that image that value increases up to 55MB .
After performing GC that value decreases to 42MB.
I checked it using jconsole.

As attachment I send you image gdynia7000_G.png and screen shot from
jconsole (jconsole.png with my description).

Mirek Pawlowski

>
> ----- Original Message -----
> From: "Don Dietrick" <dietrick_at_bbn.com>
> To: "mirek pawlowski" <mirek.pawlowski_at_ctm.gdynia.pl>; "Mariusz Wachowiak"
> <Mariusz.Wachowiak_at_ctm.gdynia.pl>
> Cc: <openmap-users_at_bbn.com>
> Sent: Monday, August 29, 2005 1:04 PM
> Subject: Re: [OpenMap Users] Is CsvTiledImagePlugIn so demanding on memory
?
>
>
> > Hi Guys,
> >
> > The CSVTiledImagePlugIn doesn't do any management with respect to
> > only loading the images that are needed. It loads all of the images
> > in the csv file at runtime and holds on to them.
> >
> > What are the pixel sizes of the images, what are their coverage
> > areas, and what is the scale of the map when are you looking at them
> > (what is the resulting image size being displayed)? When taking
> > those numbers into account, do they seem to make sense with the 420Mb?
> >
> > - Don
> >
> >
> > On Aug 29, 2005, at 4:40 AM, mirek pawlowski wrote:
> >
> > >
> > > Hi,
> > > I load a map layer using a CsvTiledImagePlugIn. The Csv file
> > > contains 27 descriptions of map data.
> > > All 27 files are in PNG format and their size rather small from 30
> > > to 70 kB. The sum of their size is about 1MB.
> > > My application without that layer occupies about 30MB but after
> > > loading that layer that value increases up to 650MB .
> > > After about 2 minutes that value decreases to 420MB.
> > > That CsvTiledImagePlugIn works properly and all data from Csv file
> > > are on the map :) but that memory consumption is horrible :( .
> > >
> > > I'm realy surprised !!!
> > >
> > > Is it correct that CsvTiledImagePlugIn is so demanding on memory ?
> > >
> > > Any advice would be appreciated.
> > >
> > > Regards
> > >
> > > Mirek Pawlowski
> > >
> > >
> >
> >
> >
> > =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
> > Don Dietrick, dietrick_at_bbn.com
> > BBN Technologies, Cambridge, MA
> > =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
> >
> >
>



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memory_chart.PNG
(image/png attachment: memory_chart.PNG)

gdynia7000_G.png
(image/png attachment: gdynia7000_G.png)

Received on Thu Sep 01 2005 - 01:30:28 EDT

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