On Nov 30, 2007, at 4:03 PM, Kenneth Prager wrote:
I understand the virtual memory operation but I don't get why the
virtual memory footprint, for a given application, grows (seemingly
without bound) over time. I can't be the only one seeing their
system go from one to many swap files over a few days time. The
reduction in performance is annoying.
Regards,
Ken Prager
At 11:04 AM -0800 11/30/07, Rich Cook wrote:
It's because your application is reserving memory but not looking
at most of it. What happens is that OS X swaps things in RAM out
to disk when they are not recently used. Do a google on "how
virtual memory works" to understand more.
On Nov 30, 2007, at 9:59 AM, Kenneth Prager wrote:
I have a question regarding an application's real memory
footprint versus its virtual memory footprint. I am asking this
question here because (a) I know that there are many
knowledgeable people here and (b) I honestly don't know which
other of the Apple lists is more appropriate (is this a Darwin
question, a Cocoa question, etc.). Also, I am asking this
question only because I am curious, not because I expect to do
anything with the information.
Here is my question: when I reboot my Mac, it starts out with one
swap file (BTW, I have 2 GB of RAM). If I look at memory usage
in the Activity Monitor, real and virtual memory footprints are
the same. After about a week I am typically up to 5 or 6 swap
files and for most applications, the virtual memory footprint is
10-15 times as large as the real memory footprint (for example,
PCalc's real footprint is 6.7 MB and virtual footprint is 364.5 MB).
Why is this? Is it because of a lack of garbage collection in
Objective C? If so, will the addition of garbage collection in
Leopard automatically solve this problem?
Thanks in advance,
Ken Prager
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