"Sun, Hui" <[email protected]> writes: > Estimation of possible speedup of MPI programs based on Streams benchmark. > > It appears you have 1 node(s) > > > Does this result basically says that my MacBook only have one node? > However, I know my computer has 4 cores, as I type sysctl -n hw.ncpu > in bash, it gives me 4. What does it really mean? By the way, here is > my configuration for this installation:
Use "lstopo" from the hwloc package to see how your cores are laid out. You probably have two physical cores, each with hypethreading (4 logical cores), sharing the same memory bus. One thread saturates the memory bus, so you get no speedup by using more cores. http://www.mcs.anl.gov/petsc/documentation/faq.html#computers
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