Decent vertex shaders will take much more than 10 cycles, moreover vertices are not unique, most vertices are going to be re-used.version said:if you read vertexstream (16bit,y,z,normalX.Y,Z,uv1,uv2=128bit ,16 byte)
and rotated, projected vertexs that about 10 cycle on SPE
then 1 SPE load 6.4 GB/s data from memory, 4 SPE kill the xdr bandwith
what doing other 4 SPE and PPE ?
Cell details (Nikkei Electronics)
- Thread starter Mikage
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nAo said:Decent vertex shaders will take much more than 10 cycles, moreover vertices are not unique, most vertices are going to be re-used.version said:if you read vertexstream (16bit
and rotated, projected vertexs that about 10 cycle on SPE
then 1 SPE load 6.4 GB/s data from memory, 4 SPE kill the xdr bandwith
what doing other 4 SPE and PPE ?
25GB/s peak bandwith that will be 15-20 GB/s real bandwith (bottleneck, latency etc...)
if 8 SPE has 25GB/s memory bandwith it is totally suxx, xbox2 will be 10times faster
Xbox will have about the same bandwith..shared with the GPU (+ edram bw) IIRC. (and maybe even CELL CPU will share that bw with the GPU..)version said:if 8 SPE has 25GB/s memory bandwith it is totally suxx, xbox2 will be 10times faster
Even if it would be nice to have more bandwith do you have to understand that with just 256/512 Mb of main ram you would not have the space to store enough unique content to be transferred in a single frame from main memory! We are going to re use a lof of stuff (instancing) or to generate a lot of content (procedural geometry generation..). That's the way we'll use all the fp power. Console never had the memory to store huge datasets per frame, and never will.
Noooooooo...think Onions!
Each SPE is a small onion (small pipeline) with concentric rings. Eight small onions (8 SPEs) work independantly...and...CELL is one big onion with concentric rings (big pipeline encompassing 8 SPEs)...these bigger concentric rings (large pipeline) link the small onions together (small pipelines)...
...I know...I've gone mad....
Each SPE is a small onion (small pipeline) with concentric rings. Eight small onions (8 SPEs) work independantly...and...CELL is one big onion with concentric rings (big pipeline encompassing 8 SPEs)...these bigger concentric rings (large pipeline) link the small onions together (small pipelines)...
...I know...I've gone mad....
nAo said:Xbox will have about the same bandwith..shared with the GPU (+ edram bw) IIRC. (and maybe even CELL CPU will share that bw with the GPU..)version said:if 8 SPE has 25GB/s memory bandwith it is totally suxx, xbox2 will be 10times faster
Even if it would be nice to have more bandwith do you have to understand that with just 256/512 Mb of main ram you would not have the space to store enough unique content to be transferred in a single frame from main memory! We are going to re use a lof of stuff (instancing) or to generate a lot of content (procedural geometry generation..). That's the way we'll use all the fp power. Console never had the memory to store huge datasets per frame, and never will.
x2 use UMA with 75 GB/s bandwith and 756MB ram, i mean
nAo said:Yeah..and my real name is Rocco Siffrediversion said:
IS IT?!! Panajev2001a
Veteran
nAo said:LOL 8)london-boy said:
Hey hey... London-boy, stop drooling
.Jaws said:Noooooooo...think Onions!
Each SPE is a small onion (small pipeline) with concentric rings. Eight small onions (8 SPEs) work independantly...and...CELL is one big onion with concentric rings (big pipeline encompassing 8 SPEs)...these bigger concentric rings (large pipeline) link the small onions together (small pipelines)...
...I know...I've gone mad....
Onions... Concentric Rings.. Damn it now ive the desire to order a Pizza and atleast a 1:8 configuration.
Ogres are like onions, too.[/Shrek]Jaws said:Noooooooo...think Onions!
Each SPE is a small onion (small pipeline) with concentric rings. Eight small onions (8 SPEs) work independantly...and...CELL is one big onion with concentric rings (big pipeline encompassing 8 SPEs)...these bigger concentric rings (large pipeline) link the small onions together (small pipelines)...
...I know...I've gone mad....
Anyway, stream processing is a great solution if you can break your problem into 8*N consecutive stages of similar processing time. That is, if you're wanting to tap all your SPEs at the same time. You could run multiple streams if not. I don't think this is going to happen for most anything outside of Naughty Dog's and Polyphony's games, though.
I hope the PS3 is like a parfait. Everybody loves parfait! A parfait may be the most delicious console in the world.
Npl said:Jaws said:Noooooooo...think Onions!
Each SPE is a small onion (small pipeline) with concentric rings. Eight small onions (8 SPEs) work independantly...and...CELL is one big onion with concentric rings (big pipeline encompassing 8 SPEs)...these bigger concentric rings (large pipeline) link the small onions together (small pipelines)...
...I know...I've gone mad....
Onions... Concentric Rings.. Damn it now ive the desire to order a Pizza and atleast a 1:8 configuration.
Are you sure it was't because of nAo's Italian sausage?
Inane_Dork said:Ogres are like onions, too.[/Shrek]Jaws said:Noooooooo...think Onions!
Each SPE is a small onion (small pipeline) with concentric rings. Eight small onions (8 SPEs) work independantly...and...CELL is one big onion with concentric rings (big pipeline encompassing 8 SPEs)...these bigger concentric rings (large pipeline) link the small onions together (small pipelines)...
...I know...I've gone mad....
Anyway, stream processing is a great solution if you can break your problem into 8*N consecutive stages of similar processing time. That is, if you're wanting to tap all your SPEs at the same time. You could run multiple streams if not. I don't think this is going to happen for most anything outside of Naughty Dog's and Polyphony's games, though.
Well, the ability to create multiple dynamic streaming pipelines is one of CELLs core/key abilities, so I'm hoping STI have had the foresight to create appropriate tools to take advantage of this so that more than Naughty Dog, Polyphony et al can take advantage of it and make it sing.
Are you sure it's safe to mention sausages in the same thread London Boy is posting in?PCEngine said:
How about I read a 7:1 compressed multiresolution mesh on one SPU, and transmit 7x data to all other SPUs on their internal bus, only using 1GB/s of main memory bus.version said:if you read vertexstream (16bit