Gimp freezes and makes whole system lagging when opening large file

Thanks for the report, it doesn't freeze here but it takes a while to open the file since it's pretty big which is expected, could you get a backtrace of that freeze and attach it to the report? Thanks.

It doesn't freeze system completely, but for 1sec and again 1sec and again 1sec.... If I move my mouse i see 1fps slide-show. All I wanted to do was resize the image, and I had to use another tool. The point is when I open it I cant stop the process of that freezes and have to force shut down my laptop. Maybe just my PC is to weak?
After 3min of backtrace I interrupted program with ctrl+c.
Maybe it's not a bug, just performance issue.

Hello,

On Mon, 2009-08-03 at 12:08 +0000, Przemysław Kochański wrote:
> It doesn't freeze system completely, but for 1sec and again 1sec and again 1sec.... If I move my mouse i see 1fps slide-show. All I wanted to do was resize the image, and I had to use another tool. The point is when I open it I cant stop the process of that freezes and have to force shut down my laptop. Maybe just my PC is to weak?
> After 3min of backtrace I interrupted program with ctrl+c.
> Maybe it's not a bug, just performance issue.
>
> ** Attachment added: "gdb-gimp.txt"
> http://launchpadlibrarian.net/29822969/gdb-gimp.txt

Could you please get a more detailed backtrace with the instructions at:
https://wiki.ubuntu.com/Backtrace and attach it to the report? It might
be a good idea to get a valgrind log as well:
https://wiki.ubuntu.com/Valgrind ; Please do so and attach both logs to
the report, Thanks in advance.

Gimp, like other programs, load the file like a BMP and need to load every single pixels. Gimp need to load 14000 X 8000 pixels... that about an image with a size of 924.4 MB.

This is really a GIMP bug because of too big memory usage when working with 3.9 MiB jpeg file.

I've tested that jpeg file with other image viewing/edidint applications and didn't noticed such big memory usage, like with GIMP.
Computer has 3Gb of RAM and no swap. I simply open image with 3 different applications and look how many they use memory with htop. Then I try to zoom in several times, then zoom out and finally - rotate image to the right (90 angle). Results of my tests:

Eog 2.30.0-0ubuntu1 :
400Mb (13,5% of total memory) after opening, zoom doesn't increase memory usage, ~800Mb during rotate;

Shotwell viewer 0.7.2-0ubuntu2 :
~40Mb (only ~1% of total memory) after opening, 1Gb (33%) after zoom, rotating doesn't increase memory usage (if I rotate before zoom, then memory usage remains ~40Mb !!!);

GIMP 2.6.8-2ubuntu1.1 :
1,3 Gb (42% of total memory) after opening, zoom doesn't increase memory usage, increased memory usage during rotate and kernel killed GIMP...

So, vietnam isn't right - GIMP uses much more memory for the same image comparing to other programs. Maybe we need to test with latest GIMP version 2.6.11 and report a bug to upstream if memory usage is too big?

vietnam wrote on 2010-01-27:
> Gimp, like other programs, load the file like a BMP and need to load every single pixels. Gimp need to load 14000 X 8000 pixels... that about an image with a size of 924.4 MB.

Reverted status in Baltix. This was my mistake.