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Sangamesh_B_
Beginner
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Memory access pattern for threads

      I've one basic question on threads memory access pattern. Suppose the computer/system/node has two sockets, each socket has its own block of memory(shared among two sockets), each socket has 4 cores. If there are two threads running(forked from a single process, may be pthreads/openmp threads), and thread 1 is on socket 1 and thread 2 on socket 2. If thread 1 tries to access data from socket 2's block of memory, then whether access time for this is same as accessing the data from its own block of memory or different? 

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TimP
Black Belt
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On typical numa platforms, including Xeon multi socket since introduction of qpi, additional cycles are spent on remote access.

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