O(N logN) parralel N-body simulation using 32 GPUs

This is a simple demonstration of the parralel Barnes-Hut treecode algorithm on 32 GPUs.
Two galaxies are interacting with each o This is a simple demonstration of the parralel Barnes-Hut treecode algorithm on 32 GPUs.
Two galaxies are interacting with each o This is a simple demonstration of the parralel Barnes-Hut treecode algorithm on 32 GPUs.
Two galaxies are interacting with each other
and collide. Two galaxies are modeled by 33,554,430 particles(4,272,458 for disk, 27,093,640 for halo, 2,188,332 for bulge).
Only the disk and bulge were visualized and the halo was invisible in this simulation result of movie.

--- Demonstration Environment ---
GPU: Nvidia GeForce8800GTS(G92)
GPU kernel: cunbody-1.9 library (http://progrape.jp/cs/)
N-body algorithm: O(N logN) Barnes-Hut treecode algorithm modified for parallel GPUs. The code was based on pC++tree by Prof. J. Makino.
Initial Cond. of data: 33,554,430 particles generated from the GalactICS package
MPI library: mpich2 1.0.7rc1
C++ compiler: gcc 4.1.2
Design languages: C++ and CUDA
CUDA version: CUDA 1.1
OS: CentOS linux version 5.1 (x86_64)
Place: Nagasaki, Japan
LastUpdate: 13 May, 2008
Copyright(c) 2008 by T. Hamada & K. Nitadori

Category:

Science & Technology

Tags:

• CUDA
• GPU
• nbody
• N-body
• treecode
• galaxy
• GPGPU
• geforce
• 8800GTS

[sonofhendrix]

what about plasma cosmology....

[cunbody1]

I am not a specialist about plasma cosmology. Did someone try to use tree code for plasma cosmology ?

[Lord8Vader]

The point is that the 8800GTS doesn't support double precision arithmetics so I am not sure that it can be used for scientific calculations...

[bibrakc]

is the code open sourced?

[part2themovie]

i was thinking the same thing

[sadmancar9]

Hi, could you tell me the initial conditions for the two galaxies. did you just set the group of particles to rotate around a point, or is it more complicated? cheers.

[saberj2x]

lol... yeh, cause... not even the new 5870 can run it well...

[oEQjet]

not very well though.

[Thet3]

SHIIIIIIIIIIIIIIIIIIIT!!!!!!!!­!!! 32 GPU'S Now that can run crysis!!!!!!

[CACBCCCU]

Newtonian gravity gives a gravity force that is proportional the the inverse square of the distance. The simulation will look more realistic, with phases appearing similar to ring galaxies and spiral clusterss with much tighter paired spiral arms, if you multiply the Newtonian force by a cosine having a wavelength close to the diameter of the clusters shown in the initial conditions given here.

[sonofhendrix]

Im no expert either, but some have used plasma cosmology and plasma physics and successfully created the known shapes of galaxies in all different stages. Its all to do with electric universe theory. Check out Joseph P. Farrel for more info.

Im really no expert but maybe using different maths you can get the same results with much less computation????? ? ? ? im probably wrong.