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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
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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.



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