Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!uwvax!tank!mimsy!chris
From: chris@mimsy.UUCP (Chris Torek)
Newsgroups: comp.unix.wizards
Subject: open() speed (was Blocking for disk I/O)
Keywords: open(2), 4.2 BSD
Message-ID: <17643@mimsy.UUCP>
Date: 20 May 89 14:13:19 GMT
References: <159@zebra.UUCP> <1608@auspex.auspex.com> <2@minya.UUCP> <8295@june.cs.washington.edu>
Organization: U of Maryland, Dept. of Computer Science, Coll. Pk., MD 20742
Lines: 23

In article <8295@june.cs.washington.edu> ka@june.cs.washington.edu
(Kenneth Almquist) writes:
>...  So I tried writing a little C program
>that opened and closed a file in the current directory 1000 times:
>
>	17.3 real    0.0 user    3.2 sys
>
>This is on an otherwise idle system running Ultrix 3.0, a 4.2 BSD
>derivative.

Here is mine (entered with the `cat' editor :-) ), and my results:

	main(){register int fd,i;
	for(i=1000;--i>=0;) fd=open("foo",0), close(fd);
	}

	% time ./t
	0.1u 0.9s 0:01 84% 1+3k 0+0io 2pf+0w

4.3BSD > Ultrix ... ?
-- 
In-Real-Life: Chris Torek, Univ of MD Comp Sci Dept (+1 301 454 7163)
Domain:	chris@mimsy.umd.edu	Path:	uunet!mimsy!chris