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000053_fdc@columbia.edu_Sat Apr 27 10:50:38 EDT 2002.msg
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Article: 13345 of comp.protocols.kermit.misc
Path: newsmaster.cc.columbia.edu!news.columbia.edu!news-not-for-mail
From: fdc@columbia.edu (Frank da Cruz)
Newsgroups: comp.protocols.kermit.misc
Subject: Re: a bug on GNU/linux: speed reset to unintended value occasionally.
Date: 27 Apr 2002 10:47:47 -0400
Organization: Columbia University
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In article <3CCA03A1.59EF10C9@yk.rim.or.jp>,
Ishikawa <ishikawa@yk.rim.or.jp> wrote:
: Frank da Cruz wrote:
: > Fujii-san wrote a book, "MS-Kermit Nyumon":
: >
: > http://www.columbia.edu/kermit/manuals.html
: > ...
:
: Until seeing the page, I didn't know books in languages other than
: in English and Japanese existed. Kermit, the program, seems to
: be used all over the world!
:
There would have been Kermit books in Russian too. We signed a contract
with the USSR state publishing house in Moscow in 1989, but before the
translations were complete, the Soviet Union disappeared.
: Based on your observation that the executable wermit may have skewed
: distribution of octet values (very likely indeed), I counted the
: frequency of each octet value. To make a long story short, I found
: that 0 is most frequent as you guessed correctly.
:
And of course long runs of NUL bytes (or any other repeated bytes)
are compressed by Kermit, so this adds another variable to the equation.
If you precompress the same file and send it with Kermit, the result
might not be very different from sending it uncompressed (depending on
the file -- this is true mostly for binary executables).
: >case-4: `case-1` setting
: > + "set prefixing none"
: > (BTW, Completion doesn't show "none" as a valid third argument.)
:
: I noticed a few cases where an accepted option is not shown in the
: response to "?" completion helper listing. The above is such a case.
: I found the effect of "minimal" and "none" is slightly
: different and so "none" ought to be listed IMHO.
:
I made it "invisible" because it is dangerous in most situations, but in
honor of your thorough investigations, maybe I can make it visible in
the next release (but it will still be dangerous).
Reading ahead...
: Incidentally, this /CALIBRATE is not shown
: in the "help send" listing because
: it is not usually necessary for an ordinary user and
: only meant for testing. Corret?
:
Yes (as Jeff said). The purpose is to send any desired amount of random
uncompressible data without having to do disk i/o, and using only a
minimum of calculation, so we can measure the performance of the protocol
on different kinds of connections with different parameters (streaming vs
window, window size, packet length, (un)prefixing, 7/8 bit, single/locking
shifts, etc), and also profile the software. Developing an algorithm to
generate unlimited amounts of non-repeating uniform random data was a
fun project.
- Frank