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alexi wrote:The examples in the Intel website certainly made no distinction between
> Thanks Adam, yes, there is a concept of processor affinity, and
> apparently some means to control the task. With this regard, Yousuf
> is right. However, this mechanism is related to allocating logical
> processors, not physical processors.
physical or logical processors. In fact, as far as Intel is concerned, all
of the processors are just logical processors. It's just that there would be
two logical processors per physical processor. Intel's Hyperthreading
mechanism makes allows for upto 256 logical processors in a physical
processor (there's an 8-bit counter for logical processors).
> As far as I remember,Nope, not random at all, it's all governed by the APIC specifications how
> enumeration of physical processors (in x86 world) is
> a random process. Different physical processors may have some
> asymmetry in the way
> they are hooked up in the system
processors are enumerated. It may have been random prior to the advent of
APIC, but now there's a specific enumeration order. Part of the spec is that
the secondary logical processors are counted well after all of the primary
logical processors have been counted.
> (different configuration ofAlmost all operating systems have the ability to allocated certain tasks to
> Hypertransport links for example),
> therefore they may have different advantages and disadvantages with
> regard to
> different I/O-loaded tasks, while Win OS treats processors
certain processors or processor groups. Windows and most other OSes will
simply allocate them round-robin by default, but there are administrative
commands available to set the processor affinity. Therefore if there are
administrative commands that can do it, then other programs should be able
to access the same facilities.
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