Groups > alt.comp.os.windows-11 > #18694

CPU enumeration (OT)

From	Jeff Barnett <jbb@notatt.com>
Newsgroups	alt.comp.os.windows-11
Subject	CPU enumeration (OT)
Date	2025-04-26 00:18 -0600
Organization	A noiseless patient Spider
Message-ID	<vuhtr9$1opqk$1@dont-email.me> (permalink)

Show all headers | View raw

Background: I recall reading in the ACPI specs (a decade or so ago) that 
some parts of a computer description were an enumeration of logical 
cores (think hyper thread hardware in Intel) and a distance map between 
them. Distance was comprised of such information as which logical cores 
shared which cache levels and number of "hops" for the logical cores to 
signal one another. The purpose of this grand scheme was so that an OS 
cold intelligently allocate threads/processes to logical cores and thus 
contribute to efficient implementations. In today's world, the logical 
cores in the same physical core are very close and others are further 
away (the metric depends on design decisions beyond my pay grade or 
comprehension). For example, server configurations with multiple CPUs on 
the same mainboard have more interesting distance information than those 
that do not.

Questions: Utilities such as windows Windows' Task Manager and Core Temp 
report on various dynamic run time conditions for each logical core. My 
questions are fairly basic: 1) how is the enumeration of logical cores 
selected by these utilities, 2) is it possible from the enumeration to 
determine which logical cores comprise the same physical core, and 3) 
haw do I determine which of the physical and logical cores are E and 
which are P in Intel equipment?
-- 
Jeff Barnett

Back to alt.comp.os.windows-11 | Previous | Next — Next in thread | Find similar | Unroll thread

Thread

CPU enumeration (OT) Jeff Barnett <jbb@notatt.com> - 2025-04-26 00:18 -0600
  Re: CPU enumeration (OT) Paul <nospam@needed.invalid> - 2025-04-26 07:02 -0400
    Re: CPU enumeration (OT) Jeff Barnett <jbb@notatt.com> - 2025-04-27 01:01 -0600

csiph-web