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# Symbolically generated GPU-based LBM
Experimental generation of OpenCL kernels using SymPy, Mako and PyOpenCL.
* Implements a straight forward AB pattern
* All memory offsets are statically resolved
* Underlying symbolic formulation is optimized using CSE
* Characteristic constants of D2Q9 and D3Q27 are transparently recovered using only discrete velocities
## Performance
Theoretical maximum performance on tested hardware:
| GPU | Bandwidth | D2Q9 | | D3Q19 | | D3Q27 | |
| ------ | ----------- | ------ | ------ | ------ | ------ | ------ | ------ |
| | | single | double | single | double | single | double |
| K2200 | 63.2 GiB/s | 893 | 459 | 435 | 220 | 308 | 156 |
| P100 | 512.6 GiB/s | 7242 | 3719 | 3528 | 1787 | 2502 | 1262 |
### Maximum measured performance...
| GPU | D2Q9 | | D3Q19 | | D3Q27 | |
| ------ | ------ | ------ | ------ | ------ | ------ | ------ |
| | single | double | single | double | single | double |
| K2200 | 843.4 | 326.4 | 423.2 | 163.8 | 303.0 | 116.0 |
| P100 | 6957.4 | 3585.0 | 3420.2 | 1763.8 | 2374.6 | 1259.6 |
### ...relative to theoretical maximum
| GPU | D2Q9 | | D3Q19 | | D3Q27 | |
| ------ | ------ | ------ | ------ | ------ | ------ | ------ |
| | single | double | single | double | single | double |
| K2200 | 94.4% | 71.1% | 97.3% | 74.5% | 98.4% | 74.4% |
| P100 | 96.1% | 96.4% | 96.9% | 98.7% | 94.9% | 99.8% |
### CSE impact on P100
| CSE | D2Q9 | | D3Q19 | | D3Q27 | |
| ------ | ------ | ------ | ------ | ------ | ------ | ------ |
| | single | double | single | double | single | double |
| No | 6957.4 | 2814.4 | 2581.8 | 998.8 | 1576.4 | 647.4 |
| Yes | 6922.4 | 3585.0 | 3420.2 | 1763.8 | 2374.6 | 1259.6 |
| CSE | D2Q9 | | D3Q19 | | D3Q27 | |
| ------ | ------ | ------ | ------ | ------ | ------ | ------ |
| | single | double | single | double | single | double |
| No | 96.1% | 75.7% | 73.2% | 55.9% | 63.0% | 51.3% |
| Yes | 95.6% | 96.4% | 96.9% | 98.7% | 94.9% | 99.8% |
For more details see the `results/` and `notebook/` directories.
## Visualization
`cavity_2d_gl_interop.py` and `channel_2d_gl_interop.py` implement basic real-time visualization of the velocity field.
See [symlbmgpu_channel_with_obstacles](http://static.kummerlaender.eu/media/symlbmgpu_channel_with_obstacles.mp4) (MP4, 25 MiB) for a short recording of how this looks.
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