Science behind the numbers

[glorybound]

What really takes so long for a scene to render? Let's say I have a scene that takes 10hrs to render with 1 machine. If I add a second machine, that is exactly the same as the first machine, I would assume my render times would be cut in half. So, if I simple add 5 of exactly the same machines, why am I not seeing near real time rendering?

[Morne]

am I mising something in your question? Maybe I dont understand what you mean?
10 / 5 = 2hr
10 / 7 = still more than 1 hour. You will have to add a lot more to get near real time
?

[glorybound]

every time I add a machine, I should reduce the render time by 1/2 (in theory).

[MoonDoggie]

I don't know the answer, but things with half-lives never reach zero.

[DanielBrew]

every time I add a machine, I should reduce the render time by 1/2 (in theory).

No, every time you double the number of render nodes you halve the render time.

[glorybound]

No, every time you double the number of render nodes you halve the render time.

Isn't that what I said?

[MoonDoggie]

No, you said each time you add one machine you halve the render time. That should only be the case when you go from 1 machine to 2. To halve it again, you'd need 4 machines, not 3.

[glorybound]

Yes. That is what I meant to say

No, you said each time you add one machine you halve the render time. That should only be the case when you go from 1 machine to 2. To halve it again, you'd need 4 machines, not 3.

[tricky]

It'll take 1/6 the render time, surely?

[DanielBrew]

No. of Machines	Render Time (mins:secs)
1	10:00
2	5:00
3	3:20
4	2:30
5	2:00
6	1:40
7	1:26
8	1:15
9	1:07
10	1:00

Assuming all machines are equal, network is infinitely fast and VRay scales perfectly.

[glorybound]

01 machine = 10hrs

02 machines - 5hrs
04 machines - 2.5hrs
08 machines - 1 1/4hrs
16 machines - 31 min
32 machines - 16 min
64 machines - 8 min
128 machines - 4 min
256 machines - 2 min
512 machines - 1 min

Google announced a cloud service and the demo was remarkable.

[glorybound]

funny... we posted at the same time. How are you getting these numbers? What formula?

No. of Machines	Render Time (mins:secs)
1	10:00
2	5:00
3	3:20
4	2:30
5	2:00
6	1:40
7	1:26
8	1:15
9	1:07
10	1:00

Assuming all machines are equal, network is infinitely fast and VRay scales perfectly.

[DanielBrew]

funny... we posted at the same time. How are you getting these numbers? What formula?

By dividing the render time by the number of machines.

[glorybound]

Here is an article on Google announcement yesterday - 7700k cores available for a single app.

http://www.datacenterknowledge.com/archives/2012/06/28/google-enters-iaas-fray-with-compute-engine/

[tricky]

By dividing the render time by the number of machines.

Am I misunderstanding this as well? Isn't it obvious? Almost tooooo obvious