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Poster | Thread | Hammer
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Re: PS3, Wii, XBox: The Neverending Story, Part 5 Posted on 25-Sep-2009 22:45:48
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Elite Member |
Joined: 9-Mar-2003 Posts: 5858
From: Australia | | |
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| @MikeB
Quote:
MikeB wrote: @Hammer
Quote:
In practise, why have PPE? |
Why not? It surely simplifies porting legacy software a lot (both as a host for development environments, as well as for hosting quick legacy ports). The SPEs only run tiny operating systems, they were designed for stream processing like Blu-Ray disc was designed for data streaming.
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Fold@Home GPU2 only consumes around less than 10 percent of Core 2 Duo T7500 2.2Ghz. CELL's is not the only stream processor.
http://www.techpowerup.com/reviews/HIS/HD_3850_IceQ3 AMD Radeon HD 3800 includes a "Command processor for reduced CPU overhead". This command processor is custom i.e. it doesn't have a standard ISA.
http://techreport.com/articles.x/12458/2 "Our tour of the R600 began, appropriately, with the GPU's command processor. Demers said previous Radeons have also had logic to process the command stream from the graphics driver, but on the R600, this is actually a processor; it has memory, can handle math, and downloads microcode every time it boots up. The reason this command processor is so robust is so it can offload work from the graphics driver. In keeping with a DirectX 10 theme, it's intended to reduce state management overhead"
Note why DirectX 10 GPU hardware has reduced CPU overhead i.e. it has a (custom) command processor. Unlike SPEs (available for STI group), R600 command processor's ISA only exist with one vendor hence it's "custom" i.e. Amiga style.
If you notice, AMD/ATI R600 has 1. command processor 2. dispatch thread processor
So, which ecosystem/platform keeps Amiga's GPU focused topology?
Last edited by Hammer on 25-Sep-2009 at 11:02 PM. Last edited by Hammer on 25-Sep-2009 at 10:59 PM. Last edited by Hammer on 25-Sep-2009 at 10:57 PM. Last edited by Hammer on 25-Sep-2009 at 10:49 PM. Last edited by Hammer on 25-Sep-2009 at 10:48 PM.
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