How Much Pain to Face the Present?

3D slab 3D toroidal flux tube

• Re-used from slab code:
  • Message-passing wrapper library Mess

  • Calibrated timer procedures

  • Performance model
    • Mostly stripped down from 3D slab

    • Same machine parameters

  • 2D DD special case of slab's 3D DD

  • 1D FFT easy strip-down from slab's 3D FFT code

• Re-used from parallel DADI work: tridiagonal solver
  

• Pain:
  • QBC code computes globally and - averaged fields communication
    • -stage data exchange from parallel tridiagonal solver re-used

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