How to deal with locality problems in ccNUMA architectures?

06 June 2019 1 10K Report

I'm studying Locality optimizations on ccNUMA architecture.I've started reading the book Introduction to high performance computing for scientists and engineers but there is a something that i dont understant.Using as example the vector triad (A[i]=B[i]+C[i]*D[i]) it says if we initialize them serial and the working set fits into the aggregate cache the scalability is good.What does it mean by that and how is this work?(Imagine 4 locality domaines with 2 cores each and with 2 threads per processor).

Im talking about the area for N

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