How are cache memories shared in multicore Intel CPUs?

Question

I have a few questions regarding Cache memories used in Multicore CPUs or Multiprocessor systems. (Although not directly related to programming, it has many repercussions wh

Answer 1

Quick answers 1) Yes 2)No, but it all may depend on what memory instance/resource you are referring, data may exist in several locations at the same time. 3)Yes.

For a full length explanation of the issue you should read the 9 part article "What every programmer should know about memory" by Ulrich Drepper ( http://lwn.net/Articles/250967/ ), you will get the full picture of the issues you seem to be inquiring about in a good and accessible detail.