Looking for a real-time N-body simulation

[grecinos]

Hey guys,

I'm looking for a real-time n-body simulation that takes advantage of a discrete GPU. I've seen YouTube videos of n-body simulations, but I'm looking for a program that I can download, change the parameters and run on my PC. Anyone?

Cheers,

grecinos

 

[scope54]

Nvidia has some samples and one of them I believe is an n-body simulation using opencl. Check them out and if im wrong maybe something else you will find in there that is interesting. https://developer.nvidia.com/opencl

edit: just found it, it's at the bottom of the page.

 

[grecinos]

Thanks for the link. That looks very close to what I'm looking for. I downloaded the "OpenCL N-Body Physics Simulation". I tried to compile the sample code with MS Visual Studio 12 but am getting an error code.

Their compiled sample crashes with some error message as well:

!!! Error # -11 (CL_BUILD_PROGRAM_FAILURE) at line 297 , in file .\src\oclBodyS
ystemOpenclLaunch.cpp !!!

Exiting...

It came with a readme doc, I'll have to do some investigating in their documentation. If you have any suggestions, that'd be great.

 

[scope54]

There is an executable in ...\NVIDIA GPU Computing SDK\OpenCL\bin\win64\Release where you can run it with these parameters:
Command line switches:
--qatest Check correctness of GPU execution and measure performance)
--noprompt Quit simulation automatically after a brief period
--n=<numbodies> Specify # of bodies to simulate (default = 7680)
--double Use double precision floating point values for simulation
--p=<workgroup X dim> Specify X dimension of workgroup (default = 256)
--q=<workgroup Y dim> Specify Y dimension of workgroup (default = 1)

I'm getting cl_device_not_found juist running ti though :x (it may be my use windows 10 drivers on 8.1)
I'll try compiling it also.


Edit: I just started typing graphics vendors (intel and amd) with n-body and also came up with this: https://software.intel.com/en-us/articles/opencl-cross-devices-nbody-simulation-sample check it out, that one may not give you as much trouble when compiling. AMD probably has an n-body sample too in one of there sdks. look around if the Nvidia one becomes a pain in the butt.

 

[grecinos]

Excellent. Thanks for the update. I'll check it out tomorrow. FYI, I'm on a Windows 7-64 bit PC.

 

[grecinos]

I downloaded Intel's n-body simulation as per your link provided. I think it's closer to successfully compiling than Nvidia's code. But, it's giving me an error message. It's complaining about a file called "cl_platform.h". It wasn't included in the intel_ocl_nbody_multidevice_win.zip file. Nvidia's simulation does have that file. I tried copying it to the appropriate directory, but no dice, it couldn't find the file. It probably wouldn't have compiled, but I was surprised that it couldn't even find the include.

 

[Shambles1980]

remember to check windows hasnt blocked any files because they came from a nother computer..
that is annoying at times when it has you trouble shooting things that dont need trouble shooting.

 

[CjStaal]

KSP with Principia
http://forum.kerbalspaceprogram.com/threads/68502-WIP-1-0-4-Principia-Bourbaki-(2015-08-15)-N-Body-and-Extended-Body-Gravitation

It's pretty accurate and you can create your own solar systems. Take a look at the notes. 2 PhD's are developing it.