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Terms used for CPU/Processor/Core/Thread or the likes ... (usage limits in preferences)in
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Questions and Answers : Preferences : Terms used for CPU/Processor/Core/Thread or the likes ... (usage limits in preferences)in

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San-Fernando-Valley
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Message 56684 - Posted: 13 Aug 2017, 9:43:18 UTC

We are very confused about the terminology used (not only) by CPDN and/or BOINC.

To our knowledge we understand, IN GENERAL, the following:

1) A motherboard can have one or more CPUs (physical object/s).

2) A CPU is the so called "Central Processing Unit".

3) A CPU is also called "processor" (the physical thing you buy at the store).

4) A "processor" has at least one "core" (inside the obove mentioned physical object).

5) A "multi-processor" has more than one core (makes i.e. mutliprocessing possible).

6) A "core" can have one or more "threads".

7) A "thread" is a certain logical pathway through the "core".

Hope you all, more or less, agree ...


If so, then one could be very irritated by the option that can be set in "preferences":
"use at most xxx % of the CPUs"?

Or, do we all have workstations which mostly have more than one CPU, err sorry, physical processor!

This setting can be found at numerous places.

Have a nice day, even after reading this!
____________
"Not everything that can be counted counts, and not everything that counts can be counted."
- Albert Einstein (1879-1955)

Profile geophi
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Message 56685 - Posted: 13 Aug 2017, 14:36:45 UTC

Boinc treats any possible thread as a CPU for the purposes of that percentage calculation. So, an i3 CPU on a desktop computer may have 2 cores, both of which have hyperthreading, so boinc sees this as 4 possible threads. Choosing 50% for the "use at most xxx % of the CPUs" will allow just 2 tasks being run at a time on that i3. There may be a better way for boinc to describe this option, but I don't want to write it and any other way of writing it may be just as confusing, although technically more correct.

Questions and Answers : Preferences : Terms used for CPU/Processor/Core/Thread or the likes ... (usage limits in preferences)in


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