Ask Ubuntu is a question and answer site for Ubuntu users and developers. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

This question already has an answer here:

Can anyone tell me the maximum number of logical as well as the maximum number of physical processors supported in the latest release of Ubuntu?

In the documentation online, I've found the 8 processor support for 32 bit, and 256 processors for 64 bit, but it is unclear whether it is referring to logical or physical processors.


share|improve this question

marked as duplicate by Mitch, Seth, Eric Carvalho, Kevin Bowen, Warren Hill Aug 1 '13 at 11:58

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Logical vs physical cores is a distinction made by the computer/CPU; the OS isn't really aware of any difference (if the OS wanted to get really picky about licensing, it could limit capability depending on what is going on in the CPU socket, but Linux doesn't).

If you're wondering about the maximum number of cores supported, you want to look to the logical cores, since each of those are a real CPU as far as the kernel is concerned.

Note: the 8-core limit in 32-bit is just a compiler option set on the generic kernel. The SMP kernel has support for more:

share|improve this answer

Not the answer you're looking for? Browse other questions tagged or ask your own question.