[HN Gopher] Understanding CPU on AIX Power SMT Systems
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       Understanding CPU on AIX Power SMT Systems
        
       Author : luu
       Score  : 30 points
       Date   : 2022-02-15 23:14 UTC (1 days ago)
        
 (HTM) web link (ardentperf.com)
 (TXT) w3m dump (ardentperf.com)
        
       | newman314 wrote:
       | A few changes to note since the P7/P8 days. As of P9, the default
       | is now SMT8 instead of SMT4.
       | 
       | Changing the profile from say P8 to P9_base to P9 changes things
       | under the hood in terms of processor capabilities. This roughly
       | translates into VM hardware versions in VMware-speak.
       | 
       | There are cores and then there are virtual processors as well as
       | the notion of processor folding. Here's a starting point:
       | https://www.ibm.com/support/pages/aix-virtual-processor-fold...
       | 
       | Some P9 specific changes re folding:
       | https://www.ibm.com/downloads/cas/39XWR7YM
       | 
       | Source: I have to deal with POWER systems day to day.
        
         | zepearl wrote:
         | > _There are cores and then there are virtual processors as
         | well as the notion of processor folding._
         | 
         | I'm really not sure if I understood that "processor folding"
         | correctly -> would that translate in the case of
         | Intel/AMD/Linux to something like a "dynamic hyperthreading"
         | done under-the-hood by the OS?
        
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       (page generated 2022-02-17 23:01 UTC)