The compute nodes on the Blue Gene/Q system comprise 17 cores on a single chip with 16 GB of dedicated physical memory. Applications run on 16 of the cores with the 17th core reserved for system software. Nearly the full 16 GB of physical memory is dedicated to application usage.
Within each job, processes (also known as tasks) are distributed to all of the compute nodes. Each node runs separate instantiations of the Compute Node Kernel (CNK). Each CNK can run multiple tasks or processes. This chapter describes some of the characteristics ...

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