Shared Text for Split i/d

[utzoo!decvax!ucbvax!menlo70!sytek!intelqa!phil]

Unless I misunderstand  V7,  seperate  I/D  programs  cannot  run
shared  text.  Why  is  this?  We  have a 11/45 with the standard
256K of memory but when the runQ has more than 4-5 large jobs  we
go  into  thrash  mode with all the swap activity.  We have tried
some things such as laying out the disk with root and swap in the
center but the benefits are barely noticeable.
        I think if the text  were  shared,  not  only  would  you
benefit  from  multiple  users  using  only  one copy of the text
segment but swaps would only require the data segments.
        Has anyone ever tried to  implement  this  under  V7?  Is
there a hardware limitation that prohibits this?

		Phil Hochstetler
		intelqa!phil
		408 496-7199

P.S. 	Info on any other performance improvements that you have 
	realized from local mods would be appreciated.