git-p4 runs out of memory

Trying to survive in a heavily Perforce dominated world, git-p4 looked like the perfect antidote. Unfortunately I have a few problems:

0. git-p4 swells until it runs out of virtual space!
It
   appears that the scripts tries to read everything 
   into memory:

 filedata = p4CmdList('-x - print',
                      stdin='\n'.join(['%s#%s' %
(f['path'], f['rev'])
                                       for f in
files]),
                      stdin_mode='w+')

  Short of rewriting git-p4, is it possible to clone
in
  multiple steps?

1. Short of full Perforce client support, support of 
   exclusion would have helped. Dmitry Kakurin
provided
   a good start. I'll try to generalize it such that
   multiple exclusion can be specified as 

     -//branch/file/blah

2. Having "git p4 commit" be an alias of 
   "git p4 submit" seems a mistake - this is not a 
   commit like a git commit, but more like a git push.

Thanks Tommy

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