[comp.binaries.ibm.pc] Kermit 2.30 part 4 / 4

tr@wind.bellcore.com (tom reingold) (01/22/88)

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end

Tom Reingold                    INTERNET:       tr@bellcore.bellcore.com
Bell Communications Research    UUCP:           rutgers!bellcore!tr
435 South St room 2L350         SOUNDNET:       (201) 829-4622 [work]
Morristown, NJ 07960                            (201) 287-2345 [home]

wcf@psuhcx (Bill Fenner) (01/24/88)

*flame on*

EVERYBODY- Unless it's going to make the file bigger (only when the file is
about 5 bytes long), ARC THE FILES BEFORE YOU UUENCODE!  You'll save the
net a LOT of money!  If you post .EXE or .COM files, you're contributing
to the downfall of comp.binaries.ibm.pc!

*flame off*

Thanks for Kermit 2.30!

   __      _  _      _____   Bill Fenner      wcf @ psuhcx.bitnet
  /  )    // //       /  '                    wcf @ hcx.psu.edu
 /--<  o // //     ,-/-, _  __  __  _  __     ihnp4!psuvax1!psuhcx.bitnet!wcf
/___/_<_</_</_    (_/   </_/ <_/ <_</_/ (_

madd@bu-cs.BU.EDU (Jim Frost) (01/25/88)

In article <2526@auscso.UUCP> johnk@auscso.UUCP (John Knutson) writes:
>First, most sites compress news before sending it.  (in fact the standard way
>is to use sendbatch to send compressed news to other systems)
>second, compress makes arced files BIGGER!!!!! it's true, believe it or not!

This is not necessarily, or even usually, true.  ARCing an ARC file
makes the resultant file bigger (providing that the user didn't force
the ARC format to non-optimal), but ARC files submitted over the net
are uuencoded, which expands them quite a bit (4 bytes for every 3, or
a 33% increase not including headers).  Since the file has been
expanded, it is subject to space savings if compression techniques are
used.  To verify that ARC files actually would save space, I ran some
tests on an actual ARC file on our system:

	Straight files:            112k (binary, can't mail)
	uuencoded files:           155k
	compressed uuencoded files: 94k

	ARC format:                 77k (binary, can't mail)
	uuencoded ARC:             120k
	compressed uuencoded ARC:   91k

I was unable to compress the actual ARC file because compress
determined that the ARC file would be bigger compressed and refused to
compress it, which is really what you would expect it to do anyway.

From the results, it is obvious that with an unARCed file, you have to
send some 35k more if the file was unARCed and transmitted in
uuencoded format, or 3k more if the uuencoded files were sent through
compress.  Note that part of the ARC file was a document and this
compressed very efficiently; you still saved 3k if it were ARCed
first.

In conclusion, ARCed files do save space and therefore time and money,
even on systems that use compression in their mailers.

jim frost
madd@bu-it.bu.edu

brad@looking.UUCP (Brad Templeton) (01/25/88)

In article <3243@psuvax1.psu.edu> wcf@psuhcx (Bill Fenner) writes:
>*flame on*
>
>EVERYBODY- Unless it's going to make the file bigger (only when the file is
>about 5 bytes long), ARC THE FILES BEFORE YOU UUENCODE!  You'll save the
>net a LOT of money!  If you post .EXE or .COM files, you're contributing
>to the downfall of comp.binaries.ibm.pc!
>
>*flame off*

EVERYBODY - don't listen to this.  Every major long distance link that is
cost conscious uses lempel-ziv compression on transmitted files.   If
Arc+LZ gives better than LZ, it's marginal.  Sometimes it is worse.

Doing ARC first does save disk space, I will say that for it, but it
doesn't do much for transmission time.
-- 
Brad Templeton, Looking Glass Software Ltd. - Waterloo, Ontario 519/884-7473