home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!olivea!decwrl!sdd.hp.com!caen!sol.ctr.columbia.edu!emory!uumind!overmind!xylos.ma30.bull.com.citadel!News
- From: xylos.ma30.bull.com!sje@overmind.mind.org
- Newsgroups: comp.os.coherent
- Subject: A review of the 1992.08 _Byte_ Coherent 4.0 review
- Message-ID: <2178466@overmind.citadel>
- Date: 22 Jul 92 23:46:00 GMT
- Organization: Bull HN, Worldwide Information Systems, Billerica, Mass., USA
- Lines: 67
- X-mailer: Stadel 3.4a-227
- X-Spam-content: irrelevant
-
- The 1992.08 issue of _Byte_ magazine has a "First Impressions" review
- of Coherent 4.0 by regular contributor Ben Smith. The article is
- found on pages 37 and 38 and is based on Smith's evaluation of a beta
- copy of the just released version of the operating system.
-
- I suspect that the "First Impressions" items are reviews of those
- products where there is just not enough lead time to produce a
- comprehensive and fully accurate evaluation. It's certainly
- challenging to produce a proper review in the first place, let alone
- with the multi-month publishing lag time. Even so, I was surprised at
- the number of minor inaccuracies Smith had in the two page piece; he
- is usually more careful in his writing. Therefore, I have decided to
- post this little note about some of the article's disreprencies.
-
- The first problem is a misleading generalization concerning the phrase
- "looks and acts like Unix" and also later comparisons of Coherent with
- various Unix and Unix-like implementations. Although some of these
- are favorable to Coherent, particularly those concerning price, Smith
- is a bit lax when defining what he exactly means by "Unix". There are
- so many implementations of Unix and Unix-like operating systems that
- an undifferentiated reference to "Unix" is so broad to be nearly
- meaningless. Indeed, in the third paragraph the author strongly
- inplies that Coherent is just one of any number of "other Unix
- systems" that support Common Object File Format.
-
- A second problem is a lack of precision when delineating the
- differences in the supplied development utilities between Coherent 3.x
- and the 4.0 version. A reader could easily conclude that nroff, ms,
- tar, and cpio (among many other utilities mentioned) are not included
- in the 3.x version. Also, it is later implied that 3.x would run only
- on 286 systems. I think that these minor faults may be due to a lack
- of experience with 3.x; perhaps there was some confusion in the
- author's reading of the 4.0 release notes. This also would have been
- a good place to mention the MWC device driver kits.
-
- Thirdly, the author states that Coherent 4.0 has demand paging and
- virtual memory. I am sure that this comes as a big surprise to the
- MWC development crew.
-
- A fourth area of concern is the unrepresentative benchmark comments.
- Smith writes, assumingly accurately, that the Dhrystone benchmark
- (tight loop iterative integer arithmetic) runs faster on both DOS and
- SCO Unix than it did with Coherent. This is the only benchmark that
- the author mentions. Why? Having developed software with Unix for
- about fifteen years, I can tell you that such a becnhmark is nearly
- meaningless because the real test of Unix development is the edit,
- compilation, link, execute, and crash cycle; this needs a fast
- character editor with good memory management support, a compiler that
- spends more time compiling then shuffling files, and a linker that
- doesn't take all day long to put together a 200 Kbyte program. All of
- these tasks require good file and disk management at either the driver
- or kernel level. It is for large tasks like these that a development
- system is measured.
-
- A fifth, and minor problem is the typo about Coherent's "100 page
- manual". I guess that either the printer dropped a zero or that Smith
- got his manual printed on newspaper size pages.
-
- Overall, the author gives a reasonable description and a conditional
- recommendation of Coherent 4.0. Let's hope that there is a full
- follow-up review in an upcoming issue.
-
- [The above opinions expressed are my own; not necessarily held by others.]
- == Steven J. Edwards Bull HN Information Systems Inc. ==
- == (508) 294-3484 300 Concord Road MS 820A ==
- == sje@xylos.ma30.bull.com Billerica, MA 01821 USA ==
- "That Government which Governs the Least, Governs Best." -- Thomas Jefferson
-