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From: akf@blic.BLI.COM (Andrew Fullford)
Newsgroups: comp.unix.wizards
Subject: Re: increasing cu throughput
Message-ID: <104@blic.BLI.COM>
Date: Fri, 8-May-87 11:40:46 EDT
Article-I.D.: blic.104
Posted: Fri May  8 11:40:46 1987
Date-Received: Sat, 9-May-87 21:30:46 EDT
References: <7284@brl-adm.ARPA>
Organization: Britton Lee, Los Gatos, CA
Lines: 11
Summary: cu performance is improved

In article <7284@brl-adm.ARPA>, anvil!es!Robert_Toxen@harvard.harvard.EDU writes:
> CU's low performance is, in deed, due its reading a character at a time.
> It should be easy (for those with source) to modify it on System III/V and
> possibly 4.2/3 BSD to read, say, 64 characters at a time and to do an
> ioctl() for the system to buffer up 64 characters at a time with a maximum
> delay of .1 or .2 seconds (VMAX=64 VTIME=1 or 2).
> 

I did this on a 3B5 running V.2.2 with VTIME=1 and saw a 40 fold cpu
time improvement on cat'ed text.  No more stutttttering when somebody
typed cc.