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- From: lupe@ukw.uucp (Lupe Christoph)
- Newsgroups: comp.sys.sun.apps
- Subject: Re: X/Wans
- Message-ID: <1992Dec21.030407.18901@ukw.uucp>
- Date: 21 Dec 92 03:04:07 GMT
- References: <1992Dec16.223456.9460@shearson.com>
- Sender: news@stasys.sta.sub.org
- Organization: cic
- Lines: 44
-
- fgreco@shearson.com (Frank Greco) writes:
-
- >In article <1992Dec4.101028.2027@cbfsb.cb.att.com> you write:
- >>We have been conducting an experiment recently to see how usable an X
- >>application is over a wide area network (UK - US).
-
- > Not too much luck over "ordinary" T1 lines.
-
- > We tried to run apps in London with $DISPLAY back to NYC, which
- > were ungodly slow (ie, unusable for trading applications). Our
- > next attempt (which we didn't complete) should be to test the
- > Xremote compression algorithm (I believe the NCD X-terminals
- > use this and is proposed to the X Consortium as a standard).
-
- > We eventually punted and put the app at the remote sites.
-
- > I guess ISDN would make X over a WAN more usable though.
-
- Is it possible you are using a satellite link? This link would incur
- a round-trip delay in the order of a second. Try running xscope. It gives
- you timestamps on the requests/responses (see man xscope while in
- Open Windows).
-
- >>Also, does the X11/NeWS server implement backing store ? and would you expect
- >>backing store to improve the situation ?
-
- > Yes it would allay the slowdown somewhat; but I really believe its
- > an inherent problem in X's design that perhaps R6 might address more
- > properly.
-
- I doubt that. Many features in X require an exchange between the client
- and the server. NeWS is much better for this kind of work, being able to
- run more parts of the application on the server. If it is at all possible,
- try converting the application to TNT; or just try one of the NeWS demos
- like jed on your link. This will tell you if the delays *are* the problem.
-
- In fact, a "narrow" line (9600 even) would be better than a "wide" line
- as T1 if the narrow line is on an Atlantic cable and the wide "line"
- runs through a satellite.
- --
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