Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/5/84; site yetti.UUCP Path: utzoo!utcs!mnetor!yetti!eriks From: eriks@yetti.UUCP (Eriks Rugelis) Newsgroups: net.arch,net.micro Subject: dhrystones on the IBM RT PC Message-ID: <316@yetti.UUCP> Date: Thu, 30-Jan-86 00:52:36 EST Article-I.D.: yetti.316 Posted: Thu Jan 30 00:52:36 1986 Date-Received: Thu, 30-Jan-86 08:23:25 EST Reply-To: eriks@yetti.UUCP (Eriks Rugelis) Organization: York University Computer Science Lines: 75 Keywords: speed, mips, similar b.s. Xref: utcs net.arch:2427 net.micro:13321 we received a brand new IBM RT PC on a one week demo from IBM; i thought i'd run a quick series of simple benchmarks for rough speed comparisons the machine is an IBM RT PC running the Interactive Systems port plus modifications of AT&T System V.1 that IBM has named AIX (Advanced Interactive eXecutive) the machine is configured with: 2 MB and the floating point accelerator board on the system bus a PC/AT co-processor board with its own 1/2 MB memory on the PC bus various other peripherals (asynch. terminal mux, disk controller..etc on the PC bus) a 70 MB hard disk and an IBM 1.2 MB floppy drive i believe that this is known as a Model 20 in the RT PC series (maybe a Model 25, i don't have my RT PC glossies handy) i ran a copy of the dhrystone benchmark, put together by Rick Richarson, and labeled as Version C/1 dated 12/01/84 as AIX booted it reported its version as 'B47 release 1 version 0' (for all i know this might just as well be referring to the version of the Virtual Resource Manager... i don't know... does ANYONE?) at 50K iterations the no-register benchmark clocked in at 1736 dhrystones/second the register benchmark produced 1879 dhrystones/second at 500K iterations the register benchmark produced 1883 dhrystones/second compiling with the fcc command that allows use of the floating point accelerator did not yield any different numbers i also compiled and ran David Hinnants C language port of the single precision whetstone benchmark using the admittedly crude technique of using a time command to gather numbers, 1 million iterations took about 5 seconds or less to complete the whetstone benchmark was run with the floating point board enabled observations and comments: IBM claims that the RT PC is a '2 MIPS' machine... the dhrystones seem to bring to the fore the contrast between CISC and RISC mips... a VAX 780 clocks around 1500 dhrystones and a 785 clocks around 2100... i have heard these to be described as about 1 and 1.5 mips machines respectively IBM claims about 200K single whetstones/second... my gross measurements appear to bear this out trademarks: this article is full of references to trademarks owned by several corporate entities; the reader is hereby advised not to take these tm's in vain more comments: the RT that i used today spent the previous night in a truck in -12C weather... it was delivered in the morning and allowed warm-up through-out the day before being turned on.... if this example is any indication, these machines seem to stand up well to freeze-drying a flame: AIX continues the IBM tradition of: distributing UNIX like systems BUT, not associating the name UNIX with said systems AND, - - -> not including machine-readable documentation with the distribution of the operating system; not even committing to EVER providing machine readable documentation of ANY sort i like on-line manuals; i bet you do too; if you have any contact with IBM, tell them.. then tell them again -- Voice: Eriks Rugelis Ma Bell: 416/665-8585 x6308 USENET: {allegra|decvax|ihnp4}!utzoo!yetti!eriks NETNORTH/BITNET: eriks@yuorion QUOTE: Of all the things I've lost, I miss my mind the most