Doubt about physcial processors and logical processors
Hi friends,
i have two sun os server I wanna know that how many physcial processors and logical processors are there?? server1 Code:
bash # psrinfo Server -2 Code:
bash # psrinfo so at server 1 physcial processor are 4 and logical processor are 8. and at server 2 physcial processor are 4 and logical processor are 12. Please suggest me that is it right or wrong??? Regards Umesh |
looks like to me 1st 4 cores and 2nd 8! 4 cpus and total! 8 cores
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1st one has four single core CPUs and 2nd has four dual core CPUs.
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so my assumtion is right...
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Both of your assumptions are incorrect about the logical processors count:
Quote:
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A physical CPU is also a logical CPU, they do not add up. |
I just recently had a similar issue which I had to explain to a junior Solaris admin.
First check the CPU type. Do some googling to see how many cores are supported in this particular CPU type. Older CPU's had no cores per CPU "chip". Newer ones now have multiple cores per CPU "chip". In the first example, there are 4 physical CPU chips installed as per "psrinfo -p". "UltraSPARC-IIIi" (RISC CHIP) has no cores just one CPU so the logical and physical numbers will be the same, nothing wrong with that. In the second example there are are 4 physical CPU chips installed as per "psrinfo -p". "Dual-Core AMD Opteron(tm) Processor 8220" (x64/CISC CHIP) has 2 cores because of the "Dual-Core" description. Therefore there are 8 logical processors. It gets better... as an added example, UltraSPARC-VII has 4 cores per CPU chip and execute two hardware threads simultaneously per core. So a 1 CPU chip UltraSPARC-VII system has 8 logical processors (4cores x 2 hardware threads x 1 CPU) |
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