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"Eric Thomas (CERN/L3)" <ERIC@LEPICS>
Tue, 23 Aug 88 15:14:24 GMT
text/plain (22 lines)
I have  just discovered a bug  in DIST2 due  to the asymetrical nature  of the
BITNET distances. You see, I had  designed my algorithm in a mathematical way,
ie with equations and everything, and, as far as topology is concerned, d(a,b)
= d(b,a) for any  (a,b) you might dream  of. Now this doesn't  quite work with
LSVBITFD distances,  because some links are  not weighted the same  way in the
two  directions. Thus,  d(LEPICS,OHSTVMA)  = 92  but  d(OHSTVMA,LEPICS) =  95,
d(OHSTVMA,CEARN) = 94 and  here you are, the algorithm decides  to do a direct
send to OHSTVMA since CEARN is obviously "in the other direction" (and it also
does a direct send to CEARN, just as if the topology was: CEARN <--> LEPICS
<--> XXX (...) <--> OHSTVMA).
 
Anyway, it is not a very serious bug  since the files do get sent and do reach
their destination  without problem. So,  there is no  reason I should  rush to
send the  fix to everybody.  The people  who asked me  for a beta-test  of the
improved DIST2 algorithm will  get a copy of the new  fixed LSVDIST2 (I didn't
keep a list  of those persons so I might  well forget 1 or 2 -  just drop me a
note if you don't get the file within a few days). If your site is intensively
using DIST2,  you might  wish to  consider asking for  a beta-test  copy, too.
Otherwise just wait for the next release.
 
  Eric

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