open() speed (was Blocking for disk I/O)

[Matt Thomas]

>In article <8295 at june.cs.washington.edu> ka at june.cs.washington.edu
>>...  So I tried writing a little C program
>>
>>	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.
>[program removed]
>
>	% 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 at mimsy.umd.edu	Path:	uunet!mimsy!chris

Hard to say, as no clue was given to the type of machine and/or disks.

    VAX 6220 (Ultrix V3.0, RA82):  0.0u 1.1s 0:00 120% 1+5k 0+1io 0pf+0w
    DS3100 (Ultrix V3.1, RZ23):    0.0u 0.2s 0:00 100% 10+21k 0+0io 0pf+0w
    uVAX II (Ultrix V3.0, RA81):   0.0u 2.8s 0:02 100% 1+5k 0+0io 0pf+0w
    VAX 8700 (Ultrix V3.1, RA81):  0.0u 0.5s 0:00 83% 1+5k 0+0io 0pf+0w

Which are rougly equivalent to the BSD 4.3 numbers.  When running over NFS,
things really slow down.   

 VAX 8700 (Ultrix V3.1, RA81+NFS): 0.0u 1.8s 0:07 26% 2+6k 0+0io 0pf+0w

-- 
Matt Thomas                     Internet:   thomas at decwrl.dec.com
DECnet-Ultrix Development       UUCP:       ...!decwrl!thomas
Digital Equipment Corporation   Disclaimer: This message reflects my own
Littleton, MA                               warped views, etc.