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PO
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3424232
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2010-08-06T13:31:34.843
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2010-08-06T13:31:34.843
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2017-05-23T12:33:53.827
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3418892
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2
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4
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text
Body
Michael Pilat's <a href="https://stackoverflow.com/questions/3418892/profiling-memory-usage-in-mathematica/3421537#3421537">answer</a> is a good one, and <code>MemoryInUse</code> and <code>MaxMemoryUsed</code> are probably the best tools you have. <code>ByteCount</code> is rarely all that helpful because what it measures can be a huge overestimate because it ignores shared subexpressions, and it often ignores memory that isn't directly accessible through Mathematica functions, which is often a major component of memory usage. One thing you can do in some circumstances is use the <a href="http://reference.wolfram.com/mathematica/ref/Share.html" rel="nofollow noreferrer"><code>Share</code></a> function, which forces subexpressions to be shared when possible. In some circumstances, this can save you tens or even hundreds of magabytes. You can tell how well it's working by using <code>MemoryInUse</code> before and after you use <code>Share</code>. Also, some innocuous-seeming things can cause Mathematica to use a whole lot more memory than you expect. Contiguous arrays of machine reals (and only machine reals) can be allocated as so-called "packed" arrays, much the way they would be allocated by C or Fortran. However, if you have a mix of machine reals and other structures (including symbols) in an array, everything has to be <a href="http://en.wikipedia.org/wiki/Boxing_(computer_science)#Boxing" rel="nofollow noreferrer">"boxed"</a>, and the array becomes an array of pointers, which can add a lot of overhead.
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1. POProfiling memory usage in Mathematica
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