Hello David and Alexay,

thanks for your suggestions! However, none of them changed the outcome.

Then I updated from 10.0.2 to 10.2.0 and now the issue is gone! I am also working with Win7 Pro x64.

Thanks again for your replies!

Max

Hi Max,

On my Win7 Pro x64, Mathematica 10.2.0, your ListConvolve does not appear to leak memory. MemoryInUse is pretty much the same after each of the 10 iterations, and in the kernel it uses less memory that the ImageConvolve. However, consolidating memory is done by the function Share[].

Best, David

In[1]:= k = GaussianMatrix[{50, 5}];
a = Table[x1 = Array[0 &, {1000, 1000}];
   (x1[[Sequence @@ #]] = 1) & /@ (RandomInteger[999, {100, 2}] + 1);
   x2 = ListConvolve[k, x1, {51, 51}];
   x3 = Image[x2];
   Print[MemoryInUse[]], {10}];

During evaluation of In[1]:= 43397800

During evaluation of In[1]:= 43398104

During evaluation of In[1]:= 43398248

During evaluation of In[1]:= 43398392

During evaluation of In[1]:= 45485456

During evaluation of In[1]:= 45485456

During evaluation of In[1]:= 45485456

During evaluation of In[1]:= 45485456

During evaluation of In[1]:= 45485456

During evaluation of In[1]:= 45485456

In[3]:= (* kernel *) MemoryInUse[]

Out[3]= 45350272

In[4]:= MemoryInUse[$FrontEnd]

Out[4]= 140931072

In[5]:= k = Image[GaussianMatrix[{50, 5}]];
a = Table[x1 = Array[0 &, {1000, 1000}];
   (x1[[Sequence @@ #]] = 1) & /@ (RandomInteger[999, {100, 2}] + 1);
   x2 = Image[x1];
   x3 = ImageConvolve[x2, k];, {10}];
MemoryInUse[]

Out[7]= 55257384