This:
702 - def _get_str(self):
703 global Save_Strings
704 if self.duplicate or self.is_derived():
705 return self.get_path()
706 srcnode = self.srcnode()
707 if srcnode.stat() is None and self.stat() is not None:
708 result = self.get_path()
709 else:
710 result = srcnode.get_path()
711 if not Save_Strings:
712 # We're not at the point where we're saving the string
713 # representations of FS Nodes (because we haven't finished
714 # reading the SConscript files and need to have str() return
715 # things relative to them). That also means we can't yet
716 # cache values returned (or not returned) by stat(), since
717 # Python code in the SConscript files might still create
718 # or otherwise affect the on-disk file. So get rid of the
719 # values that the underlying stat() method saved.
720 try: del self._memo['stat']
721 except KeyError: pass
722 if self is not srcnode:
723 try: del srcnode._memo['stat']
724 except KeyError: pass
725 return result
726
appears to be responsible for a huge number of stat calls in our build. I'm a
little confused as I don't see why the file *name* should change as the result
of Python code in the SConscript files. Shouldn't it be calling self.exists or
self.rexists (admittedly I'm not sure which one right now).
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