mirror of
https://github.com/golang/go
synced 2024-11-24 17:00:01 -07:00
nbody benchmark
timing.sh improvements R=rsc DELTA=334 (319 added, 0 deleted, 15 changed) OCL=32734 CL=32736
This commit is contained in:
Rob Pike
parent
7144e2d7f5
commit
5b1fb14371
170
test/bench/nbody.c
Normal file
170
test/bench/nbody.c
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@ -0,0 +1,170 @@
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/*
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright
|
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of "The Computer Language Benchmarks Game" nor the
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name of "The Computer Language Shootout Benchmarks" nor the names of
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its contributors may be used to endorse or promote products derived
|
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* The Great Computer Language Shootout
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* http://shootout.alioth.debian.org/
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*
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* contributed by Christoph Bauer
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*
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*/
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#include <math.h>
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#include <stdio.h>
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#include <stdlib.h>
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#define pi 3.141592653589793
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#define solar_mass (4 * pi * pi)
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#define days_per_year 365.24
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struct planet {
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double x, y, z;
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double vx, vy, vz;
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double mass;
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};
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void advance(int nbodies, struct planet * bodies, double dt)
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{
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int i, j;
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for (i = 0; i < nbodies; i++) {
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struct planet * b = &(bodies[i]);
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for (j = i + 1; j < nbodies; j++) {
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struct planet * b2 = &(bodies[j]);
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double dx = b->x - b2->x;
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double dy = b->y - b2->y;
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double dz = b->z - b2->z;
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double distance = sqrt(dx * dx + dy * dy + dz * dz);
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double mag = dt / (distance * distance * distance);
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b->vx -= dx * b2->mass * mag;
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b->vy -= dy * b2->mass * mag;
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b->vz -= dz * b2->mass * mag;
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b2->vx += dx * b->mass * mag;
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b2->vy += dy * b->mass * mag;
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b2->vz += dz * b->mass * mag;
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}
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}
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for (i = 0; i < nbodies; i++) {
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struct planet * b = &(bodies[i]);
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b->x += dt * b->vx;
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b->y += dt * b->vy;
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b->z += dt * b->vz;
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}
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}
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double energy(int nbodies, struct planet * bodies)
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{
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double e;
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int i, j;
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e = 0.0;
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for (i = 0; i < nbodies; i++) {
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struct planet * b = &(bodies[i]);
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e += 0.5 * b->mass * (b->vx * b->vx + b->vy * b->vy + b->vz * b->vz);
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for (j = i + 1; j < nbodies; j++) {
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struct planet * b2 = &(bodies[j]);
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double dx = b->x - b2->x;
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double dy = b->y - b2->y;
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double dz = b->z - b2->z;
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double distance = sqrt(dx * dx + dy * dy + dz * dz);
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e -= (b->mass * b2->mass) / distance;
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}
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}
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return e;
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}
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void offset_momentum(int nbodies, struct planet * bodies)
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{
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double px = 0.0, py = 0.0, pz = 0.0;
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int i;
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for (i = 0; i < nbodies; i++) {
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px += bodies[i].vx * bodies[i].mass;
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py += bodies[i].vy * bodies[i].mass;
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pz += bodies[i].vz * bodies[i].mass;
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}
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bodies[0].vx = - px / solar_mass;
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bodies[0].vy = - py / solar_mass;
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bodies[0].vz = - pz / solar_mass;
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}
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#define NBODIES 5
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struct planet bodies[NBODIES] = {
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{ /* sun */
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0, 0, 0, 0, 0, 0, solar_mass
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},
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{ /* jupiter */
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4.84143144246472090e+00,
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-1.16032004402742839e+00,
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-1.03622044471123109e-01,
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1.66007664274403694e-03 * days_per_year,
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7.69901118419740425e-03 * days_per_year,
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-6.90460016972063023e-05 * days_per_year,
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9.54791938424326609e-04 * solar_mass
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},
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{ /* saturn */
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8.34336671824457987e+00,
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4.12479856412430479e+00,
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-4.03523417114321381e-01,
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-2.76742510726862411e-03 * days_per_year,
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4.99852801234917238e-03 * days_per_year,
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2.30417297573763929e-05 * days_per_year,
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2.85885980666130812e-04 * solar_mass
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},
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{ /* uranus */
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1.28943695621391310e+01,
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-1.51111514016986312e+01,
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-2.23307578892655734e-01,
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2.96460137564761618e-03 * days_per_year,
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2.37847173959480950e-03 * days_per_year,
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-2.96589568540237556e-05 * days_per_year,
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4.36624404335156298e-05 * solar_mass
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},
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{ /* neptune */
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1.53796971148509165e+01,
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-2.59193146099879641e+01,
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1.79258772950371181e-01,
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2.68067772490389322e-03 * days_per_year,
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1.62824170038242295e-03 * days_per_year,
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-9.51592254519715870e-05 * days_per_year,
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5.15138902046611451e-05 * solar_mass
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}
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};
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int main(int argc, char ** argv)
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{
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int n = atoi(argv[1]);
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int i;
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offset_momentum(NBODIES, bodies);
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printf ("%.9f\n", energy(NBODIES, bodies));
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for (i = 1; i <= n; i++)
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advance(NBODIES, bodies, 0.01);
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printf ("%.9f\n", energy(NBODIES, bodies));
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return 0;
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}
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177
test/bench/nbody.go
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177
test/bench/nbody.go
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@ -0,0 +1,177 @@
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/*
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright
|
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notice, this list of conditions and the following disclaimer.
|
||||
|
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* Redistributions in binary form must reproduce the above copyright
|
||||
notice, this list of conditions and the following disclaimer in the
|
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documentation and/or other materials provided with the distribution.
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||||
|
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* Neither the name of "The Computer Language Benchmarks Game" nor the
|
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name of "The Computer Language Shootout Benchmarks" nor the names of
|
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its contributors may be used to endorse or promote products derived
|
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from this software without specific prior written permission.
|
||||
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
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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
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||||
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
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POSSIBILITY OF SUCH DAMAGE.
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*/
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/* The Computer Language Benchmarks Game
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* http://shootout.alioth.debian.org/
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*
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* contributed by The Go Authors.
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* based on C program by Christoph Bauer
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*/
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package main
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import (
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"flag";
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"fmt";
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"math";
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)
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var n = flag.Int("n", 1000, "number of iterations")
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type Body struct {
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x, y, z, vx, vy, vz, mass float64
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}
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const (
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solarMass = 4 * math.Pi * math.Pi;
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daysPerYear = 365.24;
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)
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func (b *Body) offsetMomentum(px, py, pz float64){
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b.vx = -px / solarMass;
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b.vy = -py / solarMass;
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b.vz = -pz / solarMass;
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}
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type System []*Body
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func NewSystem(body []Body) System {
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n := make(System, len(body));
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for i := 0; i < len(body); i++ {
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n[i] = new(Body); // copy to avoid overwriting the inputs
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*n[i] = body[i];
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}
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var px, py, pz float64;
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for _, body := range n {
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px += body.vx * body.mass;
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py += body.vy * body.mass;
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pz += body.vz * body.mass;
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}
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n[0].offsetMomentum(px, py, pz);
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return n;
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}
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func (sys System) energy() float64 {
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var e float64;
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for i, body := range sys {
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e += 0.5 * body.mass *
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(body.vx*body.vx + body.vy*body.vy + body.vz*body.vz);
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for j := i+1; j < len(sys); j++ {
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body2 := sys[j];
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dx := body.x - body2.x;
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dy := body.y - body2.y;
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dz := body.z - body2.z;
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distance := math.Sqrt(dx*dx + dy*dy + dz*dz);
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e -= (body.mass * body2.mass) / distance;
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}
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}
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return e;
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}
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func (sys System) advance(dt float64) {
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for i, body := range sys {
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for j := i+1; j < len(sys); j++ {
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body2 := sys[j];
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dx := body.x - body2.x;
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dy := body.y - body2.y;
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dz := body.z - body2.z;
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dSquared := dx*dx + dy*dy + dz*dz;
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distance := math.Sqrt(dSquared);
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mag := dt / (dSquared * distance);
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body.vx -= dx * body2.mass * mag;
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body.vy -= dy * body2.mass * mag;
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body.vz -= dz * body2.mass * mag;
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body2.vx += dx * body.mass * mag;
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body2.vy += dy * body.mass * mag;
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body2.vz += dz * body.mass * mag;
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}
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}
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for _, body := range sys {
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body.x += dt * body.vx;
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body.y += dt * body.vy;
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body.z += dt * body.vz;
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}
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}
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var (
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jupiter = Body {
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x: 4.84143144246472090e+00,
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y: -1.16032004402742839e+00,
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z: -1.03622044471123109e-01,
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vx: 1.66007664274403694e-03 * daysPerYear,
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vy: 7.69901118419740425e-03 * daysPerYear,
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vz: -6.90460016972063023e-05 * daysPerYear,
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mass: 9.54791938424326609e-04 * solarMass,
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};
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saturn = Body {
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x: 8.34336671824457987e+00,
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y: 4.12479856412430479e+00,
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z: -4.03523417114321381e-01,
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vx: -2.76742510726862411e-03 * daysPerYear,
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vy: 4.99852801234917238e-03 * daysPerYear,
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vz: 2.30417297573763929e-05 * daysPerYear,
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mass: 2.85885980666130812e-04 * solarMass,
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};
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uranus = Body {
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x: 1.28943695621391310e+01,
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y: -1.51111514016986312e+01,
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z: -2.23307578892655734e-01,
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vx: 2.96460137564761618e-03 * daysPerYear,
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vy: 2.37847173959480950e-03 * daysPerYear,
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vz: -2.96589568540237556e-05 * daysPerYear,
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mass: 4.36624404335156298e-05 * solarMass,
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};
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neptune = Body {
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x: 1.53796971148509165e+01,
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y: -2.59193146099879641e+01,
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z: 1.79258772950371181e-01,
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vx: 2.68067772490389322e-03 * daysPerYear,
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vy: 1.62824170038242295e-03 * daysPerYear,
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vz: -9.51592254519715870e-05 * daysPerYear,
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mass: 5.15138902046611451e-05 * solarMass,
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};
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sun = Body {
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mass: solarMass
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}
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)
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func main() {
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flag.Parse();
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system := NewSystem([]Body{sun, jupiter, saturn, uranus, neptune});
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fmt.Printf("%.9f\n", system.energy());
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for i := 0; i < *n; i++ {
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system.advance(0.01)
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}
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fmt.Printf("%.9f\n", system.energy());
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}
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2
test/bench/nbody.txt
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2
test/bench/nbody.txt
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@ -0,0 +1,2 @@
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-0.169075164
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-0.169059907
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@ -29,5 +29,8 @@ reverse-complement < output-of-fasta-25000000
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gc reverse-complement 6.55u 0.70s 7.26r
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gc_B reverse-complement 6.32u 0.70s 7.10r
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nbody -n 50000000
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gcc -O2 nbody.c 21.33u 0.00s 21.34r
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nbody 50000000
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gcc -O2 nbody.c 21.61u 0.01s 24.80r
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gccgo -O2 nbody.go 118.55u 0.02s 120.32r
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gc nbody 100.84u 0.00s 100.85r
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gc_B nbody 103.33u 0.00s 103.39r
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@ -21,18 +21,42 @@ run() {
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(/home/r/plan9/bin/time $* 2>&1 >/dev/null) | sed 's/r.*/r/'
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}
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echo 'fasta -n 25000000'
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run 'gcc -O2 fasta.c' a.out 25000000
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#run 'gccgo -O2 fasta.go' a.out -n 25000000 #commented out until WriteString is in bufio
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run 'gc fasta' $O.out -n 25000000
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run 'gc_B fasta' $O.out -n 25000000
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fasta() {
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echo 'fasta -n 25000000'
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run 'gcc -O2 fasta.c' a.out 25000000
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#run 'gccgo -O2 fasta.go' a.out -n 25000000 #commented out until WriteString is in bufio
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run 'gc fasta' $O.out -n 25000000
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run 'gc_B fasta' $O.out -n 25000000
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}
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echo
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6.out -n 25000000 > x
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echo 'reverse-complement < output-of-fasta-25000000'
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run 'gcc -O2 reverse-complement.c' a.out 25000000 < x
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run 'gccgo -O2 reverse-complement.go' a.out -n 25000000 < x
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run 'gc reverse-complement' $O.out -n 25000000 < x
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run 'gc_B reverse-complement' $O.out -n 25000000 < x
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rm x
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revcomp() {
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6.out -n 25000000 > x
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echo 'reverse-complement < output-of-fasta-25000000'
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run 'gcc -O2 reverse-complement.c' a.out 25000000 < x
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run 'gccgo -O2 reverse-complement.go' a.out -n 25000000 < x
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run 'gc reverse-complement' $O.out -n 25000000 < x
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run 'gc_B reverse-complement' $O.out -n 25000000 < x
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rm x
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}
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nbody() {
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echo 'nbody -n 50000000'
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run 'gcc -O2 nbody.c' a.out 50000000
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run 'gccgo -O2 nbody.go' a.out -n 50000000
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run 'gc nbody' $O.out -n 50000000
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run 'gc_B nbody' $O.out -n 50000000
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}
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case $# in
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0)
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run="fasta revcom nbody"
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;;
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*)
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run=$*
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esac
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for i in $run
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do
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$i
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echo
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done
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