ADSM-L

Re: Compression

1994-01-27 17:49:05
Subject: Re: Compression
From: David E Boyes <dboyes AT IS.RICE DOT EDU>
Date: Thu, 27 Jan 1994 16:49:05 -0600
> On page 138 it talks about a compression option that
> can be set up on a workstation basis.  What does this compression refer to?
> Tape? disk? network?

Compression of data before transmission. Unless you
have a *very* overloaded network, or very limited tape resources,
the loss of speed due to compression is a serious consideration.
In the case of Macintoshes, ADSM is almost unusable if
compression is enabled -- throughput on an SE-class machine drops
to less than 15K/sec (compared to 115K/sec without compression on
the same machine).

Tapes are _really_ cheap compared to the performance loss.


One general performance note: Set the TCPBUFFSIZE value and
TCPWINDOW values as high as you possibly can -- if you have the
memory, the throughput improvement is fantastic!
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