Scene texture maps resize policy: MINMEM
Posted: Thu May 20, 2021 2:13 pm
Continuing from: viewtopic.php?f=5&t=3573
Policy: MINMEM
The "MINMEM" policy is the weapon of last resort. The nuke: the one you want to use when you want to save any possible bit of memory (at cost of a longer pre-processing).
It is defined by:
"MINMEM" works in 3 steps:
1) load all image maps at "scene.images.resizepolicy.minsize";
2) compute each optimal image map resolution (i.e. the optimal is when an image map pixel cover one screen pixel);
3) reload each image map and scale to the optimal resolution (where optimal resolution can be forced up and down by "scene.images.resizepolicy.minsize").
This is reference rendering (all the image maps are 512x512):
Using:
And this is the MINMEM rendering:
Using:
The quality is the same but I have saved ~25% of the GPU ram.
The log show what MINMEM does:
It shows the optimal resolution for each image maps. It even tells me that 512x512 is not enough for the larger quad (533x533 is the optimal resolution).
Now let's render with the same scene at a lower resolution (960x540 instead of 1920x1080):
MINMEM uses even less ram thanks to the lower rendering resolution:
Because the optimal resolutions are even smaller:
Let's make the scene more complex with a glass sphere:
It uses even less ram because the optimal size of the middle quad is even smaller:
From original 512x512 (and 133x133 optimal without glass lens) to 71x71.
A real world test
This is a rendering of HallBench scene:
And this is the same rendering with MINMEM:
The saved memory is:
It requires 5.8 times less memory ! 46MB Vs 272MB.
More to come
The next strategy will use Arnold .tx files as cache and mip map levels (instead of 100% optimal size) to have about the same memory saving but at no pre-processing cost.
Policy: MINMEM
The "MINMEM" policy is the weapon of last resort. The nuke: the one you want to use when you want to save any possible bit of memory (at cost of a longer pre-processing).
It is defined by:
Code: Select all
scene.images.resizepolicy.type = MINMEM
scene.images.resizepolicy.scale = 1.0
scene.images.resizepolicy.minsize = 64
1) load all image maps at "scene.images.resizepolicy.minsize";
2) compute each optimal image map resolution (i.e. the optimal is when an image map pixel cover one screen pixel);
3) reload each image map and scale to the optimal resolution (where optimal resolution can be forced up and down by "scene.images.resizepolicy.minsize").
This is reference rendering (all the image maps are 512x512):
Using:
Code: Select all
[LuxRays][0.524] [Device GeForce RTX 2070 SUPER CUDAIntersect] ImageMaps buffer size: 5376KbytesUsing:
Code: Select all
[LuxRays][1.160] [Device GeForce RTX 2070 SUPER CUDAIntersect] ImageMaps buffer size: 4099KbytesThe log show what MINMEM does:
Code: Select all
[LuxCore][0.593] Resize policy preprocess thread count: 24
[SDL][0.855] Image maps "scenes/randomizedtiling/pattern-3.jpg" optimal resize: 512x512 => 533x533
[SDL][0.855] Image maps "scenes/randomizedtiling/pattern-7.jpg" optimal resize: 512x512 => 266x266
[SDL][0.855] Image maps "scenes/randomizedtiling/pattern-9.jpg" optimal resize: 512x512 => 133x133
[SDL][0.855] WARNING: image maps "scenes/randomizedtiling/pattern-3.jpg" too small !
[SDL][0.855] Reading texture map: scenes/randomizedtiling/pattern-3.jpg
[SDL][0.880] Image maps "scenes/randomizedtiling/pattern-3.jpg" scaled: 512x512 => 512x512
[SDL][0.880] Reading texture map: scenes/randomizedtiling/pattern-7.jpg
[SDL][0.942] Image maps "scenes/randomizedtiling/pattern-7.jpg" scaled: 512x512 => 266x266
[SDL][0.942] Reading texture map: scenes/randomizedtiling/pattern-9.jpg
[SDL][0.998] Image maps "scenes/randomizedtiling/pattern-9.jpg" scaled: 512x512 => 133x133
[SDL][0.998] Applying resize policy MINMEM time: 0.4secs
Now let's render with the same scene at a lower resolution (960x540 instead of 1920x1080):
MINMEM uses even less ram thanks to the lower rendering resolution:
Code: Select all
[LuxRays][0.923] [Device GeForce RTX 2070 SUPER CUDAIntersect] ImageMaps buffer size: 3343KbytesCode: Select all
[LuxCore][0.652] Resize policy preprocess thread count: 24
[SDL][0.726] Image maps "scenes/randomizedtiling/pattern-3.jpg" optimal resize: 512x512 => 266x266
[SDL][0.726] Image maps "scenes/randomizedtiling/pattern-7.jpg" optimal resize: 512x512 => 133x133
[SDL][0.726] Image maps "scenes/randomizedtiling/pattern-9.jpg" optimal resize: 512x512 => 66x66
[SDL][0.726] Reading texture map: scenes/randomizedtiling/pattern-3.jpg
[SDL][0.793] Image maps "scenes/randomizedtiling/pattern-3.jpg" scaled: 512x512 => 266x266
[SDL][0.793] Reading texture map: scenes/randomizedtiling/pattern-7.jpg
[SDL][0.852] Image maps "scenes/randomizedtiling/pattern-7.jpg" scaled: 512x512 => 133x133
[SDL][0.852] Reading texture map: scenes/randomizedtiling/pattern-9.jpg
[SDL][0.907] Image maps "scenes/randomizedtiling/pattern-9.jpg" scaled: 512x512 => 66x66
[SDL][0.907] Applying resize policy MINMEM time: 0.3secs
It uses even less ram because the optimal size of the middle quad is even smaller:
Code: Select all
[LuxCore][0.625] Resize policy preprocess thread count: 24
[SDL][0.702] Image maps "scenes/randomizedtiling/pattern-3.jpg" optimal resize: 512x512 => 266x266
[SDL][0.702] Image maps "scenes/randomizedtiling/pattern-7.jpg" optimal resize: 512x512 => 71x71
[SDL][0.702] Image maps "scenes/randomizedtiling/pattern-9.jpg" optimal resize: 512x512 => 66x66
[SDL][0.702] Reading texture map: scenes/randomizedtiling/pattern-3.jpg
[SDL][0.776] Image maps "scenes/randomizedtiling/pattern-3.jpg" scaled: 512x512 => 266x266
[SDL][0.776] Reading texture map: scenes/randomizedtiling/pattern-7.jpg
[SDL][0.843] Image maps "scenes/randomizedtiling/pattern-7.jpg" scaled: 512x512 => 71x71
[SDL][0.843] Reading texture map: scenes/randomizedtiling/pattern-9.jpg
[SDL][0.901] Image maps "scenes/randomizedtiling/pattern-9.jpg" scaled: 512x512 => 66x66
[SDL][0.901] Applying resize policy MINMEM time: 0.3secs
A real world test
This is a rendering of HallBench scene:
And this is the same rendering with MINMEM:
The saved memory is:
Code: Select all
[SDL][34.015] Memory required for original Image maps: 272710Kbytes
[SDL][34.015] Memory required for MINMEM Image maps: 46985Kbytes
More to come
The next strategy will use Arnold .tx files as cache and mip map levels (instead of 100% optimal size) to have about the same memory saving but at no pre-processing cost.
wow
