Path: utzoo!mnetor!uunet!seismo!sundc!pitstop!sun!decwrl!labrea!aurora!eos!ames!husc6!uwvax!speedy!planting
From: planting@speedy.cs.wisc.edu (W. Harry Plantinga)
Newsgroups: comp.sys.mac
Subject: Re: A/UX disk I/O (real numbers)
Message-ID: <5314@spool.cs.wisc.edu>
Date: 28 Feb 88 20:28:18 GMT
References: <8802251936.AA23485@cory.Berkeley.EDU> <7215@agate.BERKELEY.EDU>
Sender: news@spool.cs.wisc.edu
Reply-To: planting@speedy.cs.wisc.edu (W. Harry Plantinga)
Organization: U of Wisconsin CS Dept
Lines: 17


 >> 					Amiga	Amiga	Mac-II	Sun
 >> 					Floppy	CLtd	A/UX	3/50
 >> 
 >> Read speed,    512 buffer (byte/sec)	11014	17133	55168	240499
 >> Read speed,   4096 buffer (byte/sec)	12024	17133	53708	234057
 >
 >Under the MacOS on a MacII configured with an 80 MB CMS Pro80ii (Quantum)
 >disk drive, I get a read speed of about 512 Kilobytes per second
 >using a buffer (not cache) size of 32 KB (see PBOpen in IM or setvbuffer()
 >under MPW C), while reading an unfragmented 8+ Megabyte file.  

Let me see if I have this straight.  The mac II hardware (without DMA)
is capable of reading data off the hard disk at 512Kb/sec, compared to
the sun 3/50 (with DMA), which reads data at 240Kb/sec?

Wow!