| Re: CPU Cores with Hyper-threading enabled [message #49203 is a reply to message #49141] |
Mon, 08 April 2013 19:36  |
muttled
Messages: 7
Registered: December 2012
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Junior Member |
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Based on (my understanding of) the way OpenVZ does load balancing, the cpus represented by /proc/cpuinfo are the ones allocated (but shift around, making it unpredictable).
That means if you allocate 4 processors for a container that should have had 2 REAL cores, you're giving them between 50-100% of the actual physical processors (closer to 100% depending on processes) instead of the 50% you were expecting since load would shift around from the HT "logical" processors to the physical processors.
I'd say a rule of thumb would be to assign as many processors as you actually want them to have, and assume that the HT might give a bump sometimes overall when containers are competing for the same real cores. Again, this is based on how I interpret the information from the wiki.
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