Memory usage

[Jeffrey A Law]

  In message < 19990405235914.C597@ostenfeld.dk >you write:
  > 
  > Hi all !
  > 
  > This is not a bug. But it's almost close, and I couldn't find any
  > mention of this problem on the regular egcs list, and as this is the
  > only egcs list I follow, I thought I'd raise the topic here.
  > 
  > I'm working on a project using the egcs C++ compiler, with which I am
  > very satisfied indeed.  Only one problem:  Memory comsumption !
  > 
  > I have a <400 line C++ file, using the STL, but not at all using STL
  > *much*.  The most perverse type I use is a vector<vector<some_struct> >.
  > There are only a few functions in the file, the largest is around 250 lines, and
  > almost just a large switch() statement with less than 15 different cases.
  > 
  > Yet, the g++ compiler consumes more than 500 MB of memory when compiling
  > this with any optimization option above -O0.   No warning and no debugging
  > info options given.
Inlining is not always your friend.  Presumably either STL or your code is
declaring a lot of inline functions and/or templates.

With templates and inlining, the size of your source is not a good indicator
of how much memory will be required to optimize the code.


jeff