bs@gauss.mitre.org (Robert D. Silverman) (05/18/91)
I would like to present the following (small) benchmark code for Unix
systems. A co-worker has dubbed this 'bobstones'.
This program very seriously tests memory and data cacheing effects. It is
quite simple.
I would like to ask that people out there try this out and report the results
back to this forum. It only takes a few seconds to run.
This code is taken from a real application that spends 50% of its time
in the loop given below.
#include <stdio.h>
#include <sys/time.h>
#include <sys/resource.h>
char sieve[3000000]; /* sieve array: 3 megabytes */
main()
{
int i,j,k;
int loc;
struct rusage ru;
double tots,totu;
for (i=0; i<20000; i++) { /* for 20,000 different strides */
j = 10*i + 1; /* compute length of this stride */
loc = 3; /* starting location in the array */
while (loc < 3000000) /* starting at 'loc', add 1 to every */
{ /* j'th location in the array */
sieve[loc] += 1;
loc += j;
}
}
getrusage(RUSAGE_SELF,&ru);
totu = ru.ru_utime.tv_sec + ((double) ru.ru_utime.tv_usec / 1000000.);
tots = ru.ru_stime.tv_sec + ((double) ru.ru_stime.tv_usec / 1000000.);
printf("Total time (sys+user) :\t%.2lf (bobstones)\n", totu + tots);
printf("Page faults (min/maj) :\t%d/%d\n",ru.ru_minflt,ru.ru_majflt);
printf("Blocks in input/output :\t%d/%d\n",ru.ru_inblock,ru.ru_oublock);
printf("Context switches (vol/invol):\t%d/%d\n",ru.ru_nvcsw,ru.ru_nivcsw);
}
--
Bob Silverman
#include <std.disclaimer>
Mitre Corporation, Bedford, MA 01730
"You can lead a horse's ass to knowledge, but you can't make him think"mahmoud@karazm.math.uh.edu (Ahmed Mahmoud) (05/18/91)
In article <1991May17.181628.19207@linus.mitre.org> bs@gauss.mitre.org (Robert D. Silverman) writes: >I would like to present the following (small) benchmark code for Unix >systems. A co-worker has dubbed this 'bobstones'. > >This program very seriously tests memory and data cacheing effects. It is >quite simple. > >I would like to ask that people out there try this out and report the results >back to this forum. It only takes a few seconds to run. > I ran this benchmark on a NeXTstation 25mhz 68040 8 megs of ram. I had a few things running at the time...( kermit,edit and a terminal emulator) here are the results localhost> cc -o bench bench.c localhost> bench Total time (sys+user) : 11.98 (bobstones) Page faults (min/maj) : 0/0 Blocks in input/output : 2459/0 Context switches (vol/invol): 2533/348 localhost> ahmed
mahmoud@karazm.math.uh.edu (Ahmed Mahmoud) (05/18/91)
In article <1991May18.155143.5741@menudo.uh.edu> mahmoud@karazm.math.uh.edu (Ahmed Mahmoud) writes: >In article <1991May17.181628.19207@linus.mitre.org> bs@gauss.mitre.org (Robert D. Silverman) writes: >>I would like to present the following (small) benchmark code for Unix >>systems. A co-worker has dubbed this 'bobstones'. >> >>This program very seriously tests memory and data cacheing effects. It is >>quite simple. >> >>I would like to ask that people out there try this out and report the results >>back to this forum. It only takes a few seconds to run. >> >I ran this benchmark on a NeXTstation 25mhz 68040 8 megs of ram. I had a few >things running at the time...( kermit,edit and a terminal emulator) here >are the results >localhost> cc -o bench bench.c >localhost> bench >Total time (sys+user) : 11.98 (bobstones) >Page faults (min/maj) : 0/0 >Blocks in input/output : 2459/0 >Context switches (vol/invol): 2533/348 >localhost> > >ahmed > sorry for the above results here is a better compiling localhost> cc -o bench -O bench.c localhost> bench Total time (sys+user) : 4.95 (bobstones) Page faults (min/maj) : 0/0 Blocks in input/output : 1/0 Context switches (vol/invol): 1/123 localhost> bench Total time (sys+user) : 4.86 (bobstones) Page faults (min/maj) : 0/0 Blocks in input/output : 7/0 Context switches (vol/invol): 7/112 localhost> bench Total time (sys+user) : 4.84 (bobstones) Page faults (min/maj) : 0/0 Blocks in input/output : 0/0 Context switches (vol/invol): 0/114 localhost> ahmed
wedeck@snoopy.informatik.uni-tuebingen.de (Joerg Wedeck) (05/21/91)
here is a result for sparcstation 2 with 32 MBytes of memory: snoopy% cc -O4 test2.c snoopy% a.out Total time (sys+user) : 3.93 (bobstones) Page faults (min/maj) : 39/0 Blocks in input/output : 0/0 Context switches (vol/invol): 13/72 snoopy% a.out Total time (sys+user) : 3.83 (bobstones) Page faults (min/maj) : 40/0 Blocks in input/output : 0/0 Context switches (vol/invol): 11/73 snoopy% a.out Total time (sys+user) : 3.81 (bobstones) Page faults (min/maj) : 40/0 Blocks in input/output : 0/0 Context switches (vol/invol): 11/62 --------------------------------+------------------------------------- Joerg Wedeck | E-Mail: wedeck@peanuts.informatik\ Universitaet Tuebingen | .uni-tuebingen.de Lehrstuhl fuer Techn. Informatik| Sand 13 | 7400 Tuebingen | Germany | --------------------------------+-------------------------------------
dhinds@elaine18.Stanford.EDU (David Hinds) (05/21/91)
Results for an SGI Iris 4D/240 (4x25MHz MIPS R3000) with 16MB memory: cb-iris:~> cc -O3 -o bench bench.c cb-iris:~> bench Total time (sys+user) : 10.20 (bobstones) Page faults (min/maj) : 0/0 Blocks in input/output : 0/0 Context switches (vol/invol): 0/0 cb-iris:~> bench Total time (sys+user) : 10.22 (bobstones) Page faults (min/maj) : 0/0 Blocks in input/output : 0/0 Context switches (vol/invol): 0/0 -David Hinds dhinds@cb-iris.stanford.edu
clc5q@hemlock.cs.Virginia.EDU (Clark L. Coleman) (05/22/91)
On a VAX 8600 running BSD 4.2 Unix, without optimization ("cc"):
Total time (sys+user) : 21.71 (bobstones)
Page faults (min/maj) : 0/2
Blocks in input/output : 6/1
Context switches (vol/invol): 21/374
With optimization ("cc - O"):
Total time (sys+user) : 20.42 (bobstones)
Page faults (min/maj) : 0/2
Blocks in input/output : 6/1
Context switches (vol/invol): 21/277
-----------------------------------------------------------------------------
"The use of COBOL cripples the mind; its teaching should, therefore, be
regarded as a criminal offence." E.W.Dijkstra, 18th June 1975.
||| clc5q@virginia.edu (Clark L. Coleman)gottlieb@allan.ultra.nyu.edu (Allan Gottlieb) (05/23/91)
Here are the results for my decstation (MIPS R3000 25MHz). Ultrix 4.1 cc -O -- 16MB memory Total time (sys+user) : 4.79 (bobstones) Page faults (min/maj) : 344/0 Blocks in input/output : 0/0 Context switches (vol/invol): 26/32
dhinds@elaine18.Stanford.EDU (David Hinds) (05/23/91)
So, now that I've seen a lot of the "Bobstone" results, I have a comp.arch question: why should my SGI Iris 4D-240 do so poorly? This is a 4-processor shared-memory 25MHz MIPS R3000 system. My results were: cb-iris> time bench Total time (sys+user) : 10.18 (bobstones) Page faults (min/maj) : 0/0 Blocks in input/output : 0/0 Context switches (vol/invol): 0/0 9.900u 0.290s 0:10.20 99.9% 0+0k 0+0io 0pf+0w This is on an unloaded system, 32 MB main memory, 64K instruction cache, 64K data cache. I can't remember now if there is a secondary cache as well. When I use the "pixie" execution profiler, I find that only 1.7 sec of user time are accounted for in the profile. "pixie" says it assumes a perfect memory model. Does that mean that like 85% of the run time is occupied by cache misses ?!? This seems extraordinarily high. How large are the caches on the other MIPS systems tested - I've seen much faster times posted here. -David Hinds dhinds@cb-iris.stanford.edu
wolfe@vw.ece.cmu.edu (Andrew Wolfe) (06/06/91)
For my Decstation 3100 - 24Mb RAM (16MHz R2000) Total time (sys+user) : 7.43 (bobstones) Page faults (min/maj) : 29/0 Blocks in input/output : 0/0 Context switches (vol/invol): 0/133 (Note that the number of page faults goes down each time I run it)