Purpose

Playing around with CUDA and making some interesting simulations.

Demo

Here I make a galaxy from a box of 10,000 particles.

Compilation Dependencies

• GLFW 3.3.2
  • Environment variable: GLFW_x64 is the root directory of includes and libraries. i.e., $(GLFW_x64)/lib should resolve to the library and $(GLFW_x64)/include for the headers.
• GLEW
  • Environment variable: GLEW_PATH is the root directory of includes and libraries. i.e., $(GLEW_PATH)/lib/Release/x64 and $(GLEW_PATH)/include blah blah.
• Visual Studio 2015/17/18
• CUDA 10.2

Compilation

1. Install Visual Studio and CUDA.
2. Download GLFW and GLEW
3. Clone.
4. Open PSim.sln and build either Debug or Release

GUI

The GUI was developed using the OpenGL3 + GLFW implementation for ImGui.

Future Feature Goals

• Fully parameterizing initial conditions for gravity simulation.
• Vastly increase number of particles (done via implementing fast multipole method).
  • From preliminary calculations, it seems that the current implementation is memory bandwidth limited. By implementing FMM, it should be feasible to convert the O(N^2) runtime to O(N) and hence increase the number of particles that can be reasonably simulated substantially. Preliminary calculations expect a >100x increase in the number of simulatable particles, while maintaining 60 FPS.
• Possibly interacting particles (merging, annihilation, collision, etc.).
• Simulations other than just gravity.

Future Development Goals

• Rewriting kernels to use C++.
• Fixing memory issues.
• Refactoring functions out of kernel.cu and moving them to Model.cpp.
• Abstract Model to use inheritance to allow multiple different simulations.
• Properly fix memory errors.