Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ames!sun-barr!newstop!sun!claris!peirce
From: peirce@claris.com (Michael Peirce)
Newsgroups: comp.sys.mac
Subject: Re: Do you want to transfer files over AppleTalk?
Message-ID: <10588@claris.com>
Date: 29 Sep 89 16:43:11 GMT
References: <10169@bsu-cs.bsu.edu> <45eb3ff4.1285f@maize.engin.umich.edu>
Reply-To: peirce@claris.com (Michael Peirce)
Organization: Claris Corporation, Santa Clara CA
Lines: 53

In article <45eb3ff4.1285f@maize.engin.umich.edu> mystone@sol.engin.umich.edu writes:
>In article <10169@bsu-cs.bsu.edu> mithomas@bsu-cs.bsu.edu (Michael Thomas Niehaus) writes:
>>How many times have you had to pop a disk into one Mac just to copy a file
>>to a Macintosh sitting three feet away?  Now, if you have your machines
>>networked together, you can transfer files over AppleTalk (no disks needed).
>>
>>How do you do this?  Use "Public Folder."  Claris has been kind enough to
>>release this handy utility AT NO COST.  Because this is free software
>>...
>
>  Does it use ADSP or ATP for transferring files?  Unless is uses ADSP, I'm
>not impressed.  OK, ok, maybe I'll be impressed a little bit, but I wouldn't be impressed as much as I would be if it uses ADSP.
>
>_______________________________________________________________________________
>Dean Yu                            | E-mail: mystone@caen.engin.umich.edu
>Self-declared License Czar         | Real-mail: Dean Yu
>University of Michigan             |            909 Church St
>Computer Aided Engineering Network |            Apt C
>     INCLUDE 'Disclaimers.a'       |            Ann Arbor, MI 48104
>-------------------------------------------------------------------------------

Why in the world would people care if it uses ATP or ADSP???  Public Folder
does the job and it does it with decient performance.  Typical tranfer rates
are 15K bytes per seconds using LocalTalk to LocalTalk and maybe 55K bytes
per second EtherTalk to EtherTalk.  These transfer rates include all the
overhead: open remote file, read remote file, close remote file, create local
file, open, write, close, flushVol, as well as transfer over the network.
Your milage WILL vary based on network traffic, how many bridges you have
to go through, speed of the two Macs and their disks, and phase of the 
moon (always the most important variable!).

In practice this seems pretty good.  For short files transfer time is 
negligible.  Transfering a 10M hard disk took under four minutes over the
ethernet...

For the record, I did used ATP, rather then ADSP.  With ATP I didn't need to
allocate too much buffering.  This allows Public Folder's server resident
code and data buffers to take up less than 10K.  This compares well with
the alternatives (TOPS is a memory pig IMHO).

Anyways, I hope people find Public Folder useful even though it uses the
dreaded ATP ;-)  


Claris Corp. | Michael R. Peirce (author of Public Folder)
-------------+--------------------------------------
             | 5201 Patrick Henry Drive MS-C4
             | Box 58168
             | Santa Clara, CA 95051-8168
             | (408) 987-7319
             | AppleLink: peirce1
             | Internet:  peirce@claris.com
             | uucp:      {ames,decwrl,apple,sun}!claris!peirce