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Old 2020-04-08, 03:37   #1
jiangv
 
Jul 2019

2×7 Posts
Default Is the work thread sequence match with cpu core sequence?

Hi

I was try use p95 to testing my hardware, now I find a interesting thing.

my cpu has cores 0-13(HT disabled in bios), when I testing use 14 threads, each core running a threads.

Usually when work 6 is stopped, then I can see cpu 5 is in low occupied stat.
that means the work threads(1-14) sequence matches core sequence(0-13).

But sometimes when work 6 stopped, I see cpu 6 is in low occupied state, cpu 5 should be in low occupied stat but running in 100%.

So I'm asking, when I saw work thread stopped, should I check the cores follow then work threads swquence, or the CPU running stat
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Old 2020-04-08, 04:29   #2
Prime95
P90 years forever!
 
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Aug 2002
Yeehaw, FL

22·1,873 Posts
Default

Prime95 uses the hwloc library (you can duckduckgo it) to assign CPU affinities. I do not know how hwlock maps prime95's worker/thread# into physical core numbers on different OSes.
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