Pencil Code: progress since August 2006

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Pencil Code progress sinceAugust 2006

• Axel Brandenburg (Nordita, Stockholm)
• Wolfgang Dobler (Univ. Calgary)
• Anders Johansen (MPIA, Heidelberg)
• Antony Mee (Univ. Newcastle)
• Nils Haugen (NTNU, Trondheim)
• and many more.

(...just google for Pencil Code)
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Pencil Code

• Started in Sept. 2001 with Wolfgang Dobler
• High order (6th order in space, 3rd order in
  time)
• Cache memory efficient
• MPI, can run PacxMPI (across countries!)
• Maintained/developed by many people (CVS!)
• Automatic validation (over night or any time)
• Max resolution so far 10243 , 256 procs

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Progress since last time
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TarBall versions since 2002
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Increase in of auto tests
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Evolution of code size
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Pencil Code check-ins
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CVS annotate per UserId
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Faster and bigger machines
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256 processor run at 10243
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Hyperviscous, Smagorinsky, normal
height of bottleneck increased
Haugen Brandenburg (PRE, astro-ph/0402301)
onset of bottleneck at same position
Inertial range unaffected by artificial diffusion
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Ma10 supersonic turbulence
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MRI turbulenceMRI magnetorotational instability
2563 w/o hypervisc. t 600 20 orbits
5123 w/o hypervisc. Dt 60 2 orbits
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Same conditions??
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800,000 processors!?
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