memory leak with Cuda
- To: mathgroup at smc.vnet.net
- Subject: [mg131283] memory leak with Cuda
- From: gebe13 at neuf.fr
- Date: Mon, 24 Jun 2013 03:58:07 -0400 (EDT)
- Delivered-to: l-mathgroup@mail-archive0.wolfram.com
- Delivered-to: l-mathgroup@wolfram.com
- Delivered-to: mathgroup-outx@smc.vnet.net
- Delivered-to: mathgroup-newsendx@smc.vnet.net
Here is an application of Wolfram white paper (Heterogeneous Computing in Mathematica page 16 and 17). After several cursor movement program stops because of a memory leak. How to fix it please?
Julia set with CUDA
Needs["CUDALink`"]
code = "
__global__ void julia_kernel(Real_t * set, int width, int height, Real_t \
cx, Real_t cy) {
int xIndex = threadIdx.x + blockIdx.x*blockDim.x;
int yIndex = threadIdx.y + blockIdx.y*blockDim.y;
int ii;
Real_t x = ZOOM_LEVEL*(width/2 - xIndex);
Real_t y = ZOOM_LEVEL*(height/2 - yIndex);
Real_t tmp;
Real_t c;
if (xIndex < width && yIndex < height) {
for (ii = 0; ii < MAX_ITERATIONS && x*x + y*y < BAILOUT; ii++) {
tmp = x*x - y*y + cx;
y = 2*x*y + cy;
x = tmp;
}
c = log(0.1f + sqrt(x*x + y*y));
set[xIndex + yIndex*width] = c;
}
}";
JuliaCalculate =
CUDAFunctionLoad[code,
"julia_kernel", {{_Real, "Output"}, _Integer, _Integer, _Real, _Real}, {16,
16}, "Defines" -> {"MAX_ITERATIONS" -> 10, "ZOOM_LEVEL" -> "0.0050",
"BAILOUT" -> "4.0"}];
{width, height} = {512, 512};
jset = CUDAMemoryAllocate[Real, {height, width}];
Manipulate[
JuliaCalculate[jset, width, height, c[[1]], c[[2]], {width, height}];
ReliefPlot[Reverse@CUDAMemoryGet[jset], ColorFunction -> "Rainbow",
DataRange -> {{-2.0, 2.0}, {-2.0, 2.0}}, ImageSize -> 512, Frame -> None,
Epilog -> {Opacity[.5], Dashed, Thick,
Line[{{{c[[1]], -2}, {c[[1]], 2}}, {{-2, c[[2]]}, {2,
c[[2]]}}}]}], {{c, {0, 1}}, {-2, -2}, {2, 2}, Locator,
Appearance ->
Graphics[{Thick, Dashed, Opacity[.75], Circle[]}, ImageSize -> 50]}]
General::nomem: The current computation was aborted because there was insufficient memory available to complete the computation.