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IBM System Blue Gene Solution: Blue Gene/Q System Administration by Brant Knudson, Gary Lakner

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The Coreprocessor tool
This chapter describes the Blue Gene/Q Coreprocessor tool, which is a basic parallel debugger that enables debugging of problems at all levels (hardware, kernel, and application).
The Coreprocessor tool uses the low-level hardware JTAG interface to read and organize hardware information, including instruction address registers (IAR), general purpose registers (GPR), special purpose registers (SPR), and device control registers (DCR). It can process compute node core files, and it can also connect to a running job.
The Coreprocessor ...

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