Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!iuvax!rutgers!cs.utexas.edu!uunet!brunix!sgf
From: sgf@brunix (Sam Fulcomer)
Newsgroups: comp.periphs
Subject: Re: Hard drive speeds
Message-ID: <13700@brunix.UUCP>
Date: 28 Aug 89 13:52:19 GMT
References: <17640@ut-emx.UUCP> <16567@pasteur.Berkeley.EDU> <6987@sdcsvax.UCSD.Edu> <1989Aug28.050055.28526@utzoo.uucp>
Reply-To: sgf@cfm.brown.edu (Sam Fulcomer)
Distribution: na
Organization: Brown University Center for Fluid Mechanics
Lines: 27

In article <1989Aug28.050055.28526@utzoo.uucp> henry@utzoo.uucp (Henry Spencer) writes:
>In article <6987@sdcsvax.UCSD.Edu> jc%andataco.uucp@ucsd.edu (John Cornelius) writes:
>>Swap devices should have the highest possible transfer rate since they're
>>mostly sequential devices...
>
>Somebody's been reading old papers... Very few modern Unixes swap.  Paging

In the modern Unixes which I know about processes are born with a swap. Other
swapping (during normal scheduling) depends on the implementation of the
scheduler, but they (as far as I know) all do it. 


Try running this shell script, called fubar, on your machine and tell me if
it swaps:

#!/bin/csh

fubar &

set history=5000000
while (1)
	echo 'SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS'\
	     'WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW'\
	     'AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA'\
	     'PPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPP' \
		>>/dev/null
end