Subject: Re: Strange libc shared vs. unshared performance
To: None <port-sparc@netbsd.org>
From: matthew green <mrg@mame.mu.OZ.AU>
List: port-sparc
Date: 11/13/1994 14:31:58
   

some even more interesting observations follow.

[ i hacked the dhry.c to use getrusage() rather than time() ]

after talking to charles about this a fair bit, and testing
certain things, we found that if i link in umul.o and strcmp.o
statically to dhry.c i get a *better* benchmark than the fully
static version!


splode ~> cc -O6 dhry.c -o dhry
splode ~> ./dhry
total time was 32.113369
null time was 0.91128
page faults (0), swaps (0), context switches (617)
number of dhrystones per sec (31228.3)

splode ~> cc -O6 -static dhry.c -o dhry
splode ~> ./dhry
total time was 19.716284
null time was 0.90947
page faults (0), swaps (0), context switches (352)
number of dhrystones per sec (50954.5)

splode ~> cc -O6 dhry.c -o dhry /tmp/umul.o
splode ~> ./dhry
total time was 23.294378
null time was 0.90957
page faults (0), swaps (0), context switches (450)
number of dhrystones per sec (43097.1)

splode ~> cc -O6 dhry.c -o dhry /tmp/strcmp.o
splode ~> ./dhry
total time was 27.263282
null time was 0.90761
page faults (0), swaps (0), context switches (461)
number of dhrystones per sec (36801.9)

splode ~> cc -O6 dhry.c -o dhry /tmp/umul.o /tmp/strcmp.o
splode ~> ./dhry
total time was 18.984530
null time was 0.91005
page faults (0), swaps (0), context switches (319)
number of dhrystones per sec (52928.2)

yes, i did run these tests several times and got simliar
results each time.

.mrg.


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