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Simple program leaking memory - why?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg130732] Simple program leaking memory - why?
  • From: gredner at gmail.com
  • Date: Tue, 7 May 2013 03:55:08 -0400 (EDT)
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Hi folks,

I'm fighting an issue in which a simple Mathematica program to export a bunch of plots is leaking a huge amount of memory - enough to exhaust the 12G available on my machine.  The problem is, it looks like the program should run in bounded memory!  A simplified version of my code which demonstrates the problem follows:

====================
n = 10000;
(* just some bogus data *)
makeData[_] := Table[{{x, y} = RandomReal[{-3, 3}, {2}], {y, -x}}, {200}];
data = Array[makeData, n];
ParallelMap[
  Export[
    "movie-" <> IntegerString[#, 10, 4] <> ".png",
    ListVectorPlot[data[[#]]]] &,
  Range[1, n]];
====================

The problem occurs whether the loop is Map or Do, Parallel- or not.  It occurs in Mathematica 8 and 9, both under Linux.

The amount of memory leaked per frame is considerable - approximately .6 MB in my tests.  I don't see where it could be going, unless Export is caching every byte which passes through it!

I've also asked this question on stackexchange [1] but so far nobody has a clue.

Thanks,
-Gabe

[1] http://mathematica.stackexchange.com/questions/24461/why-does-this-simple-program-leak-memory



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