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Remembering the Past
Posted: Thu Jan 31, 2019 7:58 am
Continuing an old story, based on a vague memory of a gadget made from a magnetic base a ferric spheres, I found this intermediate.
Remembering the Past, updated
Posted: Fri Feb 01, 2019 7:55 am
Respecting first acceptable screen resolution of home PCs, I have chosen 800x600 base resolution and rendered a 300% 2400x1800 picture.
On my PC with two amd R9 x90X graphic cards and current recommended adrenaline 19.1.1 driver this took already a while, total path depth 40, clamped around 30'000.
Wiki lists for R9 390X, floating point single-prec. (IEEE-754 32 bit) 5,9 TFlops and for double-prec. (IEEE-754 64 bit) 0.74 TFlops, memory bandwith 384 GByte/s; the R9 290X is about as fast at 90% of 390X.
Because I was not so happy with scenes draft version I added glass spheres, changed floor material form matte to glossy with some roughness, added four area lights, red, green, blue and amber (once a promising approach to mix white light for setable blackbody temperature) and moved spot light to the center above top of the sculpture.
The next picture rendered almost 7 hours on CPU intel 64 bit i7 4770K 3.5 GHz (4+4 cores) speed unclear yet ~0.17 TFlops, BiDir depth 80, Metropolis and tonemapper Reinhard.
Remembering the Past, the scene file
Posted: Fri Feb 01, 2019 8:03 am
I guess the are some tricks to improve rendering speed for the scene, with out loosing visible depth in reflections of the spheres in 4800x3600 pictures.
Feel free to download and tweak the scene.
Remembering the Past, GPU 4800x3600
Posted: Fri Feb 01, 2019 6:16 pm
Takes some time with total path depth of 80, doesn't it?
Both, test result discussion and conclusions follow soon, as well as some meta ideas behind the scene.
Remembering the Past, Resolutions and Relations
Posted: Sat Feb 02, 2019 1:52 am
My analysis requires a few intermediate steps, like this one, the collection of historical data.
The illustration is 50% reduced. Original resolution cannot be uploaded yet even with jpg size of 5 MB.
EDIT 1: Due to layout issues, code part replaced with an image.
EDIT 2: bits per on screen image corrected and considered for theoretical speed comparision.
Remembering the Past, examples CPUs since 1982
Posted: Sat Feb 02, 2019 5:02 pm
Intels performance for Core ix's floating points/cycle ratio is impressive compared with AMD's current Ryzen's performance but AMD is probably in the be the better position with already released 7 nm products while intel postponed market launch of their 10 nm Core ix CPUs again. Moore's law or better intels hypothesis about numbers of transistors depens on structure size development and latter defines electrical resistance together with useable frequency what also means efficiency respective dissipation. As long as decreasing structures' size was 'simple' (besides to achivewith every step smaller particle sizes and counts in clean rooms, chemicals and also reducing abrasion of instruments and processes) companies' roadmaps followed intel's hypothesis as if there were a bounty to get. The cards are shuffled and freshly dealt. May the player with smarters moves get ahead of next round, the Dissipation Management.
Remembering the Past, example GPU since 2006
Posted: Sun Feb 03, 2019 1:38 am
Before 2006 graphic cards for gaming did not support double precision (32 bit) floating point operation.
But since then the cards computing power increased rapidly and reached within a few years TFLOPs level much more oeconomicly than CPUs.