GopherProxy

	timplement first attempt at adaptive meshing - sphere - GPU-based 3D discrete e…
	git clone git://src.adamsgaard.dk/sphere
	Log
	Files
	Refs
	LICENSE
	---
	commit 5adc4fde4fddd30f5591249a497353c17665df1b
	parent de8f4eb1433514d7729abe95e9e1367161bb1ef6
	Author: Anders Damsgaard Christensen <[email protected]>
	Date: Fri, 2 Sep 2016 15:39:29 -0700

	implement first attempt at adaptive meshing

	Diffstat:
	M src/datatypes.h \| 1 +
	M src/device.cu \| 25 +++++++++++++++++++++++++
	M src/sphere.h \| 3 +++

	3 files changed, 29 insertions(+), 0 deletions(-)
	---
	diff --git a/src/datatypes.h b/src/datatypes.h
	t@@ -47,6 +47,7 @@ struct Grid {
	Float L[ND]; // World dimensions
	unsigned int num[ND]; // Neighbor-search cells along each axis
	int periodic; // Behavior of boundaries at 1st and 2nd world edge
	+ int adaptive; // Continuously rescale grid size to wall positions
	};

	struct Sorting {
	diff --git a/src/device.cu b/src/device.cu
	t@@ -348,6 +348,25 @@ __host__ void DEM::transferToConstantDeviceMemory()
	checkConstantMemory();
	}

	+__host__ void DEM::updateGridSize()
	+{
	+ Float Lz;
	+
	+ // Get top wall position from dev_walls_nx[0].z
	+ cudaMemcpy(&Lz, &dev_walls_nx[0].z, sizeof(Float), cudaMemcpyDeviceToHost);
	+
	+ // Write value to grid.L[2]
	+ grid.L[2] = Lz;
	+
	+ // Write value to devC_grid.L[2]
	+ cudaMemcpyToSymbol(devC_grid.L[2], &Lz, sizeof(Float));
	+
	+ checkForCudaErrors("After updating grid size");
	+
	+ // check value only during debugging
	+ checkConstantMemory();
	+}
	+

	// Allocate device memory for particle variables,
	// tied to previously declared pointers in structures
	t@@ -999,6 +1018,12 @@ __host__ void DEM::startTime()
	checkForCudaErrorsIter("Post checkParticlePositions", iter);
	#endif

	+ // If the grid is adaptive, readjust the grid height to equal the
	+ // positions of the dynamic walls
	+ if (grid.adaptive == 1) {
	+ updateGridSize();
	+ }
	+
	// For each particle:
	// Compute hash key (cell index) from position
	// in the fine, uniform and homogenous grid.
	diff --git a/src/sphere.h b/src/sphere.h
	t@@ -138,6 +138,9 @@ class DEM {
	const float imgw,
	const float focalLength);

	+ // Adjust grid size according to wall placement
	+ void updateGridSize();
	+
	// Allocate global device memory to hold data
	void allocateGlobalDeviceMemory();
	void rt_allocateGlobalDeviceMemory();