9GB image slows down gnome

[Lorac]

It slows my UI so much that gnome somehow crashes and restart the session. Gnome is slowing down for no apparent reason because the CPU usage is really low (<15) while scanning the image. I have an i7-7700.

[ChrisCinelli]

Look at you memory and swap size. How does it look like?

If it is above a few GBytes, it is a big fixed by PR #92.

On my Mac large images, or images with a lot of files ended up making the fan go full speed (because the kernel had to swap all memory out) and even moving the cursor up and down lag 10-20 secs.

I looked at the memory and dive was taking 15Gb.

[Lorac]

I have 32Gb of RAM and 4GB available swap. It's not using much. It's not using any swap.

It's really hard to monitor use because my UI is getting really choppy. I cannot do much while dive is running on this big image.

I'll test the PR on my side and see if it helps.

[Lorac]

Actually, just to be sure I restarted my computer, and the choppiness stopped from gnome, but it took about 19Gb of RAM. 0 swap. The analysis of the image was much faster too... I'll have to investigate on my side for that.

[wagoodman]

This is the same as #27 , but we can track the issue here.

[ChrisCinelli]

#102 Fixes most of this problem for me.
Fixing #105 will also help to further reduce memory usage

[ChrisCinelli]

Check #106. With the do-not-write-image code the laptop is pretty fast and the memory is low.

When I navigate an image with a lot of files, though, dive's ui is very sluggish. Try with the image butomo1989/docker-android-x86-9.0. When you scroll down the layers, you have to eventually wait a few seconds to switch layers.
The UI code seems to be responsible for this.

[wagoodman]

#108 was just merged and fixes this issue (should make it in v0.4.0)