What determines VSIZE allocation?
What determines VSIZE allocation?
- Subject: What determines VSIZE allocation?
- From: "Tobias Zimmerman" <email@hidden>
- Date: Wed, 14 Jan 2009 17:31:32 -0500
I have searched for an answer to this question, including in Amit Singh's
book, but have not found the answer (at least, not in a form that I
recognize it).
I have a fairly simple Cocoa app that creates an NSStatusItem with a small
menu. It is compiled using Garbage Collection and in 64bit mode (it
identifies in the Activity Monitor as "Intel(64 bit)".
In non-debug mode it basically just sits there. The active memory usage is
quite reasonable -- about 4.5 to 7.5MB of RPRVT, 10MB RSIZE and 23-30MB
RSHRD. However, the VSIZE is 8.36GB ("giga", with a "G"). Compiling in
32bit mode drops VSIZE to 475MB, which is still an awful lot for such a
small app.
I know there are people who will say "VSIZE doesn't matter if there is no
paging", but if I ever sought to distribute my app people will not want to
install a statusitem that looks like a memory hog.
My question is two-fold: (1) How does the OS determine how much to allocate
to VSIZE? and (2) is there something I am doing wrong in my app (likely)
that is causing the out-sized allocation?
I am a newbie w/r/t cocoa and objective-C, but I have read the article on
garbage collection and tried to understand and apply it.
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