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From: jrw@hropus.UUCP (Jim Webb)
Newsgroups: net.unix
Subject: Re: why is fprintf(stderr,) slow?
Message-ID: <633@hropus.UUCP>
Date: Mon, 18-Aug-86 13:47:07 EDT
Article-I.D.: hropus.633
Posted: Mon Aug 18 13:47:07 1986
Date-Received: Tue, 19-Aug-86 08:14:16 EDT
References: <19300053@uiucdcsb>
Organization: Bell Labs, Holmdel, NJ
Lines: 10

> I was doing about 500 fprintf(stderr, "blah...\n");
> 
> The program was taking 35 or 40 seconds of system time which was pretty
> high.  I then commented out the fprintf's and the program took 17 or 18
> system time seconds (it was doing a lot of disk accesses).

Standard error is unbuffered, eg, one char at a time, so it makes one
write system call per character, hence its slowness.
-- 
Jim Webb             "Out of phase--get help"         ihnp4!houxm!hropus!jrw