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OS X - Development and Darwin Discussion and questions about development for Mac OS X.

Question on calculating memory used in a program

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Member Since: Dec 21, 2007
Posts: 1
catsophie is on a distinguished road

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My question is why my calculation on memory usage is much different from the VSIZE shown in "top" command?

I calculated memory usage of my c program, compiling with gcc-4.0.1 on a MacPro. The funny thing is that my calculation shows about 40MB maximum memory usage, but the largest VSIZE in "top" command for this program is about 300MB. I double-checked my calculation and was sure that it is correct. My friend told me that it might be due to gcc's memory management strategy, which might not collect garbage as long as there is memory available. It might be true, since I dynamically allocate and release a lot of memory.

Can anybody give me more suggestions? Thanks!!!
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Member Since: Dec 24, 2006
Location: N. Ireland
Posts: 901
Del has a spectacular aura about
Mac Specs: Mac Pro 2xQuad core 2.8GHZ

Del is offline
Maybe you have a memory leak or two in your code?
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Member Since: Nov 20, 2007
Location: Dublin, Ireland
Posts: 9
Exolon is on a distinguished road

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From the manpage for top:
VSIZE(delta) Total address space allocated, including shared pages.
RSIZE(delta) Total resident memory size, including shared pages.
I think you're looking for RSIZE
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