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The RAM requirement of a system running a real time kernel is dominated by

  • A.the amount of constant data held in flash
  • B.the stacks of the tasks together with the kernel's own structures
  • C.the size of the compiled program image
  • D.the number of interrupt vectors in the table

Answer: B

Each task needs its own stack sized for its deepest call chain plus an interrupt frame, and a dozen tasks at half a kilobyte each is six kilobytes before any buffers. The program image lives in flash and constants need no RAM at all.

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