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I am running a program that takes a significant amount of time to complete. According to my system monitor, only 20% of the available memory is being used (1.6GiB out of 7.7GiB available).

I'm wondering why is the available memory not being used? Any information would be greatly appreciated.

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Does the program have configurable options or use other programs such as MySQL where you can allocate more memory to caches, etc that will increase the speed of operations? –  Bert May 2 '13 at 14:12

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It probably doesn't need that much RAM.

If I write a program that opens a file with a random filename, writes "Hi there, Moon!", and closes that file cleanly, and repeats that a couple of million times, It would use very little memory, but will take a lot of time.

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I see your point. Thanks for the insight. –  Brian F. May 2 '13 at 13:54

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