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Bonsai -- A GPU gravitational [BH]-tree code

Copyright [2010-2017] Jeroen Bédorf [email protected] Evghenii Gaburov [email protected]

License

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this code except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

BonsaiSPH

The version of Bonsai that has support for SPH can be found in the BonsaiSPH branch of this repository.

Bonsai demo keys

  • [esc] quit
  • [h] / [~] sliders
  • [space] toggle simulation
  • [r] toggle rendering
  • [p] move through particle render modes (volumetric, points, additive point sprites)
  • [b] toggle octree boxes
  • [l] toggle display light scatter buffer
  • [c] fit camera
  • [[] decrement minimum octree display level
  • []] increment minimum octree display level
  • [-] decrement maximum octree display level
  • [=] increment maximum octree display level
  • [g] toggle glow / post processing
  • [f] toggle fly mode (use wasd to steer, right mouse to go faster)
  • [n] detonate supernova
  • [1] toggle direct (N^2) gravitation

Bonsai Program arguments

Standard:

  • -h Display the help and shows default argument values

  • -i Input snapshot filename

  • --dev Device ID to run simulation on

  • -t Simulation time-step

  • -T Simulation end-time

  • -e Softening-value (will be squared)

  • -o Opening angle (theta)

  • -r Rebuild tree every # steps

  • --snapname Snapshot base name (N-body time is appended in 000000 format)

  • --snapiter Snapshot iteration (N-body time)

  • --valueadd Value to add to the snapshot name

  • --log Enable printfs

  • --logfile Filename to store kernel timing information

  • --rmdist Particle removal distance (uncommented in the code)

Demo specific:

  • --reducebodies Cut down bodies dataset by # factor

  • --reducedust Cut down dust dataset by # factor

  • --direct Enable N^2 direct gravitation

  • --renderdev Device ID to run the visualization on

  • --fullscreen Set fullscreen mode string, format: [ width "x" height ][ ":" bitsPerPixel ][ "@" videoRate ]

  • --displayfps Enable on-screen FPS display

  • --Tglow Enable glowing particles @ # Myr

  • --dTglow Reach full brightness in @ # Myr

Compile tips and tricks

Using CMake under Linux:

For Demo purposes: cmake -DUSE_CUB=0 -DUSE_DUST=1 -DUSE_OPENGL=1

For production simulations cmake -DUSE_CUB=0 -DUSE_DUST=0

Using MPI under linux: cmake -DCMAKE_CXX_COMPILER=mpicxx

Compilation for Fermi architecture: cmake -DCOMPILE_SM30=0

Compilation for Tesla architecture: Sorry not supported anymore, time to upgrade your hardware!

Compilation with device debugging: cmake -DCUDA_DEVICE_DEBUGGING=1

Build debug configuration: cmake -DCMAKE_BUILD_TYPE=Debug

(Or use ccmake CMakeCache.txt, to alter the properties)