Path: utzoo!attcan!uunet!steinmetz!davidsen
From: davidsen@steinmetz.ge.com (William E. Davidsen Jr)
Newsgroups: comp.dcom.modems
Subject: Re: need help with xenix Kermit to PC procomm
Summary: No, no, not FACTS!
Message-ID: <11982@steinmetz.ge.com>
Date: 25 Aug 88 17:48:38 GMT
References: <20302@neabbs.UUCP> <11744@oberon.USC.EDU>
Reply-To: davidsen@crdos1.UUCP (bill davidsen)
Organization: General Electric CRD, Schenectady, NY
Lines: 49


  In regard to the performance of several file transfer programs, I
measured the performance on a number of those discussed, and here are
the results. The machines were both unloaded (l.a. < .2) and timing
info was from the accounting file. Note that they are not at all the
same speed machine, so don't compare the sending and receiving CPU
times with each other.

  All files were sent from the slow machine to the fast machine, if
anyone can argue that this makes a difference. Since the two kermit
sends were in one process which did a bunch of other stuff on the
sender, no results for the CPU were available.

protocol	cps	S-cpu	R-cpu	line%
________________________________________________

kermit		110	n.a.	0.24	45.8	std kermit
swkermit	164	n.a.	0.62	68.3	window kermit
Zmodem		222	3.9	0.12	92.5	rzsz (feb 88?)
uucp7		221	5.0	1.48	92.1	uucp, 7 windows

The uucp figures include the other stuff that uucp does, and CPU may be
way high. I forgot to try X and Y modem, etc.

These are figures for August from uploads and downloads to/from the *IX
BBS during Aug. I make no claims that they are typical, but here they
are. All figures from transfers of 20k or more to reduce the impact of startup.

protocol	@2400	@1200	#dnld	#upld
________________________________________________________________

Ymodem		200	112	367	 48
Zmodem		229	115(a)	 45	  0
Kermit		140	79	120(b)	(b)

(a) there was only ONE use of Zmodem at 1200 baud, this figure may not
    be very accurate.
(b) 120 total transfers. I don't lok upload and download for kermit.
(c) not a single use of Xmodem this month!

  Anyone is welcome to quote these figures in context, and to draw any
conclusions they want. Since uucp is acceptably fast, and both machines
are usually lightly loaded, and uucp is a nice quick to use command, I
usually use it. If I were using a slow and/or noisy line I would use
zmodem, because it allows me to restart the transfer.
-- 
	bill davidsen		(wedu@ge-crd.arpa)
  {uunet | philabs | seismo}!steinmetz!crdos1!davidsen
"Stupidity, like virtue, is its own reward" -me