Mailinglist archive
| Mailinglist: | PanoTools NG |
| Sender: | Helmut Dersch |
| Date/Time: | 9-Mar-2008 12:07:24 +0100 |
| Subject: | Re: Fast Gigapixel Stitching on the Playstation 3 |
Thread:
--- In #removed#, "matt_nolan_uaf" <matt.nolan@...>
wrote:
>
>> ...the bottleneck in your system is I/O speed...
Yes and no: while we cannot get below a limit set by IO-speed,
we have not reached this limit. And lowering this limit
by providing faster IO has some but not much effect.
Example: For small projects I can set PTStitcherNG to use
a ramdisk, which is 800MByte/s compared with the usual 30MByte/s.
This increases overall processing speed by appr. 10-15%, although
disk-IO takes almost 50% of the time. This is due to buffering
and background operation, which is implemented in the
system software.
> Disks speeds of 80-120 MB/s are fairly easy to attain on a
> modern PC (and up to 800 MB/s are possible),..
Well, this could be the beginning of a long thread,...
>... benchmark Enblend or Smartblend on a PS3 vs. PC to assess the
> performance advantage due to the PS3's processor?
Enblend can be compiled on the PS3. It then uses (like any
other standard linux-application) just the PPU-part of the cell-
processor, which closely resembles a 3.2GHz powerpc (G5?),
so you would expect the same speed as obtained on older
Apple-hardware. Due to low memory size (256MB) you can't do
much with this setup.
Regards
Helmut Dersch
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