Hej allihop!!
Envis som jag är var jag tvungen att kolla med stienberg om VST-5.1 i pc verison
stödjer dual cpu.
Läs och lär: :kaaaka!:
Steinberg's Support for Dual Processor PCs with Windows 2000 and XP.
Steinberg has supported dual processor PC computers in previous versions. When
a suitable system was found, Cubase used the second processor by default. This
meant that the complete audio engine, including all mixing and effects, would
be running on the one processor, while the other processor would be responsible
for all other activities, such as MIDI processing, the file handling for the
audio engine, and the Cubase user interface.
With the arrival of the Windows 2000 (and XP) and new dual processor computers,
multi-processing has arrived on standard machines. Steinberg uses this to
greatly increase the amount of power available to the VST audio engine.
With the previous multiprocessor scheme the maximum processing power available
to the audio engine was 1 CPU, as the complete audio process could only exist
on one or the other processor. Now the audio-processing load can be split much
more evenly between the two processors. Still one processor is doing the MIDI,
file handling and user interface, but its remaining processor bandwidth can be
used to support audio tasks. You as a user only have to turn Advanced
Multiprocessing on in the audio system set-up and forget it. We estimate that
this new Multiprocessing scheme brings about a 50-60% increase in processing
power over a standard single processor machine, and about 20-30% increase over
previous multi-processor performance.
This multi-processor concept is quite complicated to explain so that maybe a
few diagrams would help.
These diagrams represent the processing bandwidth that a processor can provide
and how it is divided up among the various tasks the processor has to perform.
The size of the colored areas indicates a proportion of the processor
bandwidth. All these tasks are to some extent dynamic, as they require varying
amounts of processor power over a period of time. The amount of processor
bandwidth required for VST tasks is relatively constant for audio channels, but
is very dynamic for VST Instruments; it depends on how many notes you play.
What\'s very important to realize is that the Cubase user interface is updated
in the time when there is nothing else more important to do on a particular
processor. As well as this, the amount of processing time required for the user
interface varies a great deal depending on whether the whole screen needs to be
redrawn or just the song cursor moved.
Anyway take a look at the following diagrams
Conventional Single Processor System.
In a single processor system or a system where a second processor is disabled,
the processing power of the CPU is divided among the differing tasks the
computer must perform. All the tasks displayed above are variable in the amount
of time they need. The processor performance required for the audio tasks are
normally the main draw on the CPU\'s capability.
Conventional Dual Processor System.
In a dual processor system, such as supported by the standard multi-processor
scheme in the Cubase 3.7 series, the complete audio processing was carried out
by one processor, leaving the other far more time for other tasks. This means
that the user interface tasks had far more processor time available. This meant
the user interface tended to be very responsive. The audio processes have to
have a CPU for themselves and provided an audio performance boost in comparison
with having to share a processor with other tasks. A disadvantage is that there
is a lot of potential unused processing power on the other processor because
the needs of a user interface task tend to be lightweight compared with audio
tasks. What you should notice is that the audio tasks exist as a block on one
processor they cannot use more than that processor\'s power. Dividing the audio
tasks up such that they could run on multiple processors, in parallel, is no
simple task - but that\'s exactly what we have done.
Steinberg's new true parallel processing model within the audio tasks allows
the audio-processing load to be balanced out over the two processors. This
means that the total amount of processing power available for audio processing
is considerably more than a system supporting conventional dual processing
where one processor is used for the entire audio processing. Sharing the
audio-processing load maximizes the amount of processor power that is available
for audio tasks.
You will need a dual processor computer and Windows 2000 (or XP) to make use of
Advanced Multiprocessing and Cubase 5.0r2
Steinberg Media Technologies AG ©2001
