I seem to have loads of free RAM even though my script is taking 10 minutes to run

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Tom
Tom 2012-4-5
I seem to have loads of free RAM even though my script is taking 10 minutes to run. I have a MacBook Pro i7 with 8GB of RAM and I use a small app called 'Memory Freer' to free up inactive memory. It shows how much RAM is wired/available/free/inactive. I have a script which has different options for the length of one of the variables, N, and I'd like to try out a few of the longer ones, but above a certain length, N, it starts to take my computer upwards of 2 minutes to do it. While this is happening, Memory Freer still says that there's over 4 GB of free RAM. How do I make Matlab use this RAM?
I've looked at the Java memory option in preferences, but that only lets you give it up to 256 MB.
Any help would be great.
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Matt Fig
Matt Fig 2012-11-2
Tom's question
I seem to have loads of free RAM even though my script is taking 10 minutes to run. I have a MacBook Pro i7 with 8GB of RAM and I use a small app called 'Memory Freer' to free up inactive memory. It shows how much RAM is wired/available/free/inactive. I have a script which has different options for the length of one of the variables, N, and I'd like to try out a few of the longer ones, but above a certain length, N, it starts to take my computer upwards of 2 minutes to do it. While this is happening, Memory Freer still says that there's over 4 GB of free RAM. How do I make Matlab use this RAM?
I've looked at the Java memory option in preferences, but that only lets you give it up to 256 MB.
Any help would be great.

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Bjorn Gustavsson
Bjorn Gustavsson 2012-4-5
Well, then it seems as if memory is not the limiting factor for the performance of your algorithm, maybe CPU-time/cycles are what start adding up for larger N. So maybe your algorithm is O(N^m) (or worse?) with m larger than 1, perhaps even larger than 3?
It is a bit difficult to have a more detailed opinion given amount of information.
HTH

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