Which thread goes to what core?

I

Injen

Weaksauce
Joined
Dec 20, 2012
Messages
76
Maybe a wierd question, but i'm setting up Logitech ARX and want to sort cores to threads.
But i don't know which threads belong to each cores.

For an example.
Core 1 = Thread 1 and 2
etc

i7 3770k
 
In case of hyperthreading, each core (hardware level) appears as two adjacent execution threads (software level). See the example below:

cores.png
 
You're not really going to know which thread is sorting through which core at any given time.
Threads tend to get doled out to cores on a first-available basis.
 
The OS schedules threads to cores. It tries to re-schedule a thread on the same core each quantum because the core has the context of that thread in cache. Scheduling a thread to a different core means it's likely that anything the thread tries to do with memory is a cache miss. On the other hand, if the desired core is busy (and busy for a long time) then it's probably lost a bunch of cache context for the thread and it's better to schedule it someplace else, and for better latency it's best to schedule the thread on the next available core.
 
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