Ram usage

[bradon]

i do believe i did try to render at half res. was the same issue 12 GB ram

[bradon]

yes precalculate can help because then we can use the frame blend option. what i seem to remember was that either way the LC took an insane amount of ram. with 500 subdiv was the same as 2000 subdiv. maybe my test was flawed i can check again but seemed like lowering the settings didnt lower the ram usage which seems odd. perhaps i did something wrong.

whoops ok yes so this was obviously incorrect. my bad, ran the test again just to make sure. when i only use 500 subdives on the LC the ram usage is around 6GB so roughly half. so obviously there might be issues with flickering still with using too low of subdivs. will try to look into the pre-filtering and other options. would be nice to know if there was a way i could trade cpu time for ram time in the LC though. my cpu sits idle while im swapping ram if i ned the subdivisons to be a higher level. im just assuming that at 500 and 6GB or ram i cant increase much before i bottleneck at 8GB. might be a bit low for what i need, ill try to blend see if that helps.

[bradon]

working on better tests.

here are some results.
http://www.paraportable.net/files/TimeMemTest_1.txt
http://www.paraportable.net/files/TimeMemTest_2.txt
http://www.paraportable.net/files/TimeMemTest_3.txt
http://www.paraportable.net/files/TimeMemTest_4.txt


an intersting thing to note is that the ram usage does go down when I lower the subdivs in the LC but also when I turn on world mode. compare test 1 to test 3. test 1 uses 12 GB of ram and test 3 uses only 6GB, only diference is is turned world mode OFF for test 3, however the frame time was over 4 times as long. but compare to test 4 where the sample size i increase to "1", render time was back to the same. I havent compared the results yet for quality. I think we did need to use the world mode ON to reduce the flicker, but I want to get a handle on the ram usage first.

[bradon]

now i see that the sample size does have a very big impact on the ram usage and the amount of actual rays in the LC. I did a few more test if anyone wants to see the results.

http://www.paraportable.net/files/TimeMemTest_5.txt
http://www.paraportable.net/files/TimeMemTest_6.txt
http://www.paraportable.net/files/TimeMemTest_7.txt
http://www.paraportable.net/files/TimeMemTest_8.txt
http://www.paraportable.net/files/TimeMemTest_9.txt
http://www.paraportable.net/files/TimeMemTest_10.txt

would be nice if there was a way to calculate the max ram usage during a render frame. i guess there are windows utilites for that sort of thing.