> For reasons I don't
> recall at the moment, pymol uses more memory with a pse file than with
> the same objects loaded through a script (you could check the list
> archives for more details if you're curious).

Just FYI:  This is an unfortunate unavoidable consequence of the fact
that we use Python's portable, platform-independent "pickle" machinery
for PyMOL session files.  Packing or unpacking a Session or Scene file
thus requires that there be two simultanous copies of the information to
reside in RAM simultaneously:  one native and a second in Python itself.

So when memory is a limiting factor, we definitely recommend using
scripts instead of sessions.

> 
> > PyMOL simply crashes under Windows Vista Home Premium as well as
under
> > Ubuntu Linux v8.04 LTS without error report. My dual OS system is a
> 
> Not sure about windows, but with linux you should get some level of
> messages by launching from a command prompt instead of an icon.  If
> you're running out of memory, you'll get a core dump message (at
least,
> that the usual symptom on my systems.

> You might want to have top running in a different terminal so watch
how
> much memory pymol is trying to use (or is able to use before
crashing).

Correct -- To get those same console messages on Windows, you need to
launch PyMOLWin.exe from a Windows command line with the "+2" option to
prevent PyMOL from hiding the console window:

(start menu -> run -> cmd [return])
 
cd c:\program files\delano scientific\pymol

pymolwin + 2




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