On Wed, 23 Jul 2003, Brooks Davis wrote: > I don't think you need to worry about this too much since all MP capable > cpus with the HT flag set are Xeons which actually support two siblings. > I would point out that if you go to all the trouble of removing the > logical CPUs from the output, someone is probalby going to get annoyed > that you did that because they wanted to see them in the output. After > all, for some applictions, treating each logical CPU as a physical CPU > is a good fit.
Unfortunately, this doesn't appear to hold true either. I have found three dual XEON systems around here and checked cpuinfo in each: System #1 (No ht): 2 procs shown, ht flag set, no physical id or siblings fields. Sysyem #2 (ht): 4 procs shown, ht flag set, no physical id or siblings fields. System #3 (ht); 4 procs shown, ht flag set, physical ids of 0,0,3,3 and siblings=2 for all. So we can't count on having the physical id or the siblings field present. I am inclined to go with the config file option until there becomes a more standard way of extracting this info. --Rick
