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nbody benchmark

Browse Source 
timing.sh improvements

R=rsc
DELTA=334  (319 added, 0 deleted, 15 changed)
OCL=32734
CL=32736
This commit is contained in:
Rob Pike 2009-08-04 14:27:46 -07:00
parent 7144e2d7f5
commit 5b1fb14371
5 changed files with 391 additions and 15 deletions
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170
test/bench/nbody.c Normal file
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/*
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
* Neither the name of "The Computer Language Benchmarks Game" nor the
name of "The Computer Language Shootout Benchmarks" nor the names of
its contributors may be used to endorse or promote products derived
from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
*/
/*
* The Great Computer Language Shootout
* http://shootout.alioth.debian.org/
*
* contributed by Christoph Bauer
*
*/
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#define pi 3.141592653589793
#define solar_mass (4 * pi * pi)
#define days_per_year 365.24
struct planet {
double x, y, z;
double vx, vy, vz;
double mass;
};
void advance(int nbodies, struct planet * bodies, double dt)
{
int i, j;
for (i = 0; i < nbodies; i++) {
struct planet * b = &(bodies[i]);
for (j = i + 1; j < nbodies; j++) {
struct planet * b2 = &(bodies[j]);
double dx = b->x - b2->x;
double dy = b->y - b2->y;
double dz = b->z - b2->z;
double distance = sqrt(dx * dx + dy * dy + dz * dz);
double mag = dt / (distance * distance * distance);
b->vx -= dx * b2->mass * mag;
b->vy -= dy * b2->mass * mag;
b->vz -= dz * b2->mass * mag;
b2->vx += dx * b->mass * mag;
b2->vy += dy * b->mass * mag;
b2->vz += dz * b->mass * mag;
}
}
for (i = 0; i < nbodies; i++) {
struct planet * b = &(bodies[i]);
b->x += dt * b->vx;
b->y += dt * b->vy;
b->z += dt * b->vz;
}
}
double energy(int nbodies, struct planet * bodies)
{
double e;
int i, j;
e = 0.0;
for (i = 0; i < nbodies; i++) {
struct planet * b = &(bodies[i]);
e += 0.5 * b->mass * (b->vx * b->vx + b->vy * b->vy + b->vz * b->vz);
for (j = i + 1; j < nbodies; j++) {
struct planet * b2 = &(bodies[j]);
double dx = b->x - b2->x;
double dy = b->y - b2->y;
double dz = b->z - b2->z;
double distance = sqrt(dx * dx + dy * dy + dz * dz);
e -= (b->mass * b2->mass) / distance;
}
}
return e;
}
void offset_momentum(int nbodies, struct planet * bodies)
{
double px = 0.0, py = 0.0, pz = 0.0;
int i;
for (i = 0; i < nbodies; i++) {
px += bodies[i].vx * bodies[i].mass;
py += bodies[i].vy * bodies[i].mass;
pz += bodies[i].vz * bodies[i].mass;
}
bodies[0].vx = - px / solar_mass;
bodies[0].vy = - py / solar_mass;
bodies[0].vz = - pz / solar_mass;
}
#define NBODIES 5
struct planet bodies[NBODIES] = {
{ /* sun */
0, 0, 0, 0, 0, 0, solar_mass
},
{ /* jupiter */
4.84143144246472090e+00,
-1.16032004402742839e+00,
-1.03622044471123109e-01,
1.66007664274403694e-03 * days_per_year,
7.69901118419740425e-03 * days_per_year,
-6.90460016972063023e-05 * days_per_year,
9.54791938424326609e-04 * solar_mass
},
{ /* saturn */
8.34336671824457987e+00,
4.12479856412430479e+00,
-4.03523417114321381e-01,
-2.76742510726862411e-03 * days_per_year,
4.99852801234917238e-03 * days_per_year,
2.30417297573763929e-05 * days_per_year,
2.85885980666130812e-04 * solar_mass
},
{ /* uranus */
1.28943695621391310e+01,
-1.51111514016986312e+01,
-2.23307578892655734e-01,
2.96460137564761618e-03 * days_per_year,
2.37847173959480950e-03 * days_per_year,
-2.96589568540237556e-05 * days_per_year,
4.36624404335156298e-05 * solar_mass
},
{ /* neptune */
1.53796971148509165e+01,
-2.59193146099879641e+01,
1.79258772950371181e-01,
2.68067772490389322e-03 * days_per_year,
1.62824170038242295e-03 * days_per_year,
-9.51592254519715870e-05 * days_per_year,
5.15138902046611451e-05 * solar_mass
}
};
int main(int argc, char ** argv)
{
int n = atoi(argv[1]);
int i;
offset_momentum(NBODIES, bodies);
printf ("%.9f\n", energy(NBODIES, bodies));
for (i = 1; i <= n; i++)
advance(NBODIES, bodies, 0.01);
printf ("%.9f\n", energy(NBODIES, bodies));
return 0;
}

177
test/bench/nbody.go Normal file
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/*
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
* Neither the name of "The Computer Language Benchmarks Game" nor the
name of "The Computer Language Shootout Benchmarks" nor the names of
its contributors may be used to endorse or promote products derived
from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
*/
/* The Computer Language Benchmarks Game
* http://shootout.alioth.debian.org/
*
* contributed by The Go Authors.
* based on C program by Christoph Bauer
*/
package main
import (
"flag";
"fmt";
"math";
)
var n = flag.Int("n", 1000, "number of iterations")
type Body struct {
x, y, z, vx, vy, vz, mass float64
}
const (
solarMass = 4 * math.Pi * math.Pi;
daysPerYear = 365.24;
)
func (b *Body) offsetMomentum(px, py, pz float64){
b.vx = -px / solarMass;
b.vy = -py / solarMass;
b.vz = -pz / solarMass;
}
type System []*Body
func NewSystem(body []Body) System {
n := make(System, len(body));
for i := 0; i < len(body); i++ {
n[i] = new(Body); // copy to avoid overwriting the inputs
*n[i] = body[i];
}
var px, py, pz float64;
for _, body := range n {
px += body.vx * body.mass;
py += body.vy * body.mass;
pz += body.vz * body.mass;
}
n[0].offsetMomentum(px, py, pz);
return n;
}
func (sys System) energy() float64 {
var e float64;
for i, body := range sys {
e += 0.5 * body.mass *
(body.vx*body.vx + body.vy*body.vy + body.vz*body.vz);
for j := i+1; j < len(sys); j++ {
body2 := sys[j];
dx := body.x - body2.x;
dy := body.y - body2.y;
dz := body.z - body2.z;
distance := math.Sqrt(dx*dx + dy*dy + dz*dz);
e -= (body.mass * body2.mass) / distance;
}
}
return e;
}
func (sys System) advance(dt float64) {
for i, body := range sys {
for j := i+1; j < len(sys); j++ {
body2 := sys[j];
dx := body.x - body2.x;
dy := body.y - body2.y;
dz := body.z - body2.z;
dSquared := dx*dx + dy*dy + dz*dz;
distance := math.Sqrt(dSquared);
mag := dt / (dSquared * distance);
body.vx -= dx * body2.mass * mag;
body.vy -= dy * body2.mass * mag;
body.vz -= dz * body2.mass * mag;
body2.vx += dx * body.mass * mag;
body2.vy += dy * body.mass * mag;
body2.vz += dz * body.mass * mag;
}
}
for _, body := range sys {
body.x += dt * body.vx;
body.y += dt * body.vy;
body.z += dt * body.vz;
}
}
var (
jupiter = Body {
x: 4.84143144246472090e+00,
y: -1.16032004402742839e+00,
z: -1.03622044471123109e-01,
vx: 1.66007664274403694e-03 * daysPerYear,
vy: 7.69901118419740425e-03 * daysPerYear,
vz: -6.90460016972063023e-05 * daysPerYear,
mass: 9.54791938424326609e-04 * solarMass,
};
saturn = Body {
x: 8.34336671824457987e+00,
y: 4.12479856412430479e+00,
z: -4.03523417114321381e-01,
vx: -2.76742510726862411e-03 * daysPerYear,
vy: 4.99852801234917238e-03 * daysPerYear,
vz: 2.30417297573763929e-05 * daysPerYear,
mass: 2.85885980666130812e-04 * solarMass,
};
uranus = Body {
x: 1.28943695621391310e+01,
y: -1.51111514016986312e+01,
z: -2.23307578892655734e-01,
vx: 2.96460137564761618e-03 * daysPerYear,
vy: 2.37847173959480950e-03 * daysPerYear,
vz: -2.96589568540237556e-05 * daysPerYear,
mass: 4.36624404335156298e-05 * solarMass,
};
neptune = Body {
x: 1.53796971148509165e+01,
y: -2.59193146099879641e+01,
z: 1.79258772950371181e-01,
vx: 2.68067772490389322e-03 * daysPerYear,
vy: 1.62824170038242295e-03 * daysPerYear,
vz: -9.51592254519715870e-05 * daysPerYear,
mass: 5.15138902046611451e-05 * solarMass,
};
sun = Body {
mass: solarMass
}
)
func main() {
flag.Parse();
system := NewSystem([]Body{sun, jupiter, saturn, uranus, neptune});
fmt.Printf("%.9f\n", system.energy());
for i := 0; i < *n; i++ {
system.advance(0.01)
}
fmt.Printf("%.9f\n", system.energy());
}

2
test/bench/nbody.txt Normal file
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-0.169075164
-0.169059907

7
test/bench/timing.log
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@ -29,5 +29,8 @@ reverse-complement < output-of-fasta-25000000
gc reverse-complement 6.55u 0.70s 7.26r gc reverse-complement 6.55u 0.70s 7.26r
gc_B reverse-complement 6.32u 0.70s 7.10r gc_B reverse-complement 6.32u 0.70s 7.10r
nbody -n 50000000 nbody 50000000
gcc -O2 nbody.c 21.33u 0.00s 21.34r gcc -O2 nbody.c 21.61u 0.01s 24.80r
gccgo -O2 nbody.go 118.55u 0.02s 120.32r
gc nbody 100.84u 0.00s 100.85r
gc_B nbody 103.33u 0.00s 103.39r

50
test/bench/timing.sh
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@ -21,18 +21,42 @@ run() {
(/home/r/plan9/bin/time $* 2>&1 >/dev/null) | sed 's/r.*/r/' (/home/r/plan9/bin/time $* 2>&1 >/dev/null) | sed 's/r.*/r/'
} }
echo 'fasta -n 25000000' fasta() {
run 'gcc -O2 fasta.c' a.out 25000000 echo 'fasta -n 25000000'
#run 'gccgo -O2 fasta.go' a.out -n 25000000 #commented out until WriteString is in bufio run 'gcc -O2 fasta.c' a.out 25000000
run 'gc fasta' $O.out -n 25000000 #run 'gccgo -O2 fasta.go' a.out -n 25000000 #commented out until WriteString is in bufio
run 'gc_B fasta' $O.out -n 25000000 run 'gc fasta' $O.out -n 25000000
run 'gc_B fasta' $O.out -n 25000000
}
echo revcomp() {
6.out -n 25000000 > x 6.out -n 25000000 > x
echo 'reverse-complement < output-of-fasta-25000000' echo 'reverse-complement < output-of-fasta-25000000'
run 'gcc -O2 reverse-complement.c' a.out 25000000 < x run 'gcc -O2 reverse-complement.c' a.out 25000000 < x
run 'gccgo -O2 reverse-complement.go' a.out -n 25000000 < x run 'gccgo -O2 reverse-complement.go' a.out -n 25000000 < x
run 'gc reverse-complement' $O.out -n 25000000 < x run 'gc reverse-complement' $O.out -n 25000000 < x
run 'gc_B reverse-complement' $O.out -n 25000000 < x run 'gc_B reverse-complement' $O.out -n 25000000 < x
rm x rm x
}
nbody() {
echo 'nbody -n 50000000'
run 'gcc -O2 nbody.c' a.out 50000000
run 'gccgo -O2 nbody.go' a.out -n 50000000
run 'gc nbody' $O.out -n 50000000
run 'gc_B nbody' $O.out -n 50000000
}
case $# in
0)
run="fasta revcom nbody"
;;
*)
run=$*
esac
for i in $run
do
$i
echo
done