Delete flaky benchmark test

src/third_party/computer_language_benchmarks_game/nbody.c

-/* The Computer Language Benchmarks Game
- * http://benchmarksgame.alioth.debian.org/
- *
- * contributed by Christoph Bauer
- * slightly sped up by Petr Prokhorenkov
- */
-
-#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;
-};
-
-/*
- * Here's one weird thing: inlining of this function
- * decreases performance by 25%. (I.e. do not compile this with -O3)
- * Advances with dt == 1.0
- */
-void advance(int nbodies, struct planet * bodies)
-{
-  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 inv_distance = 1.0/sqrt(dx * dx + dy * dy + dz * dz);
-      double mag = inv_distance * inv_distance * inv_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 += b->vx;
-    b->y += b->vy;
-    b->z += 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
-  }
-};
-
-#define DT 1e-2
-#define RECIP_DT (1.0/DT)
-
-/*
- * Rescale certain properties of bodies. That allows doing
- * consequential advance()'s as if dt were equal to 1.0.
- *
- * When all advances done, rescale bodies back to obtain correct energy.
- */
-void scale_bodies(int nbodies, struct planet * bodies, double scale) {
-    int i;
-
-    for (i = 0; i < nbodies; i++) {
-        bodies[i].mass *= scale*scale;
-        bodies[i].vx *= scale;
-        bodies[i].vy *= scale;
-        bodies[i].vz *= scale;
-    }
-}
-
-int main(int argc, char ** argv)
-{
-  int n = atoi(argv[1]);
-  int i;
-
-  offset_momentum(NBODIES, bodies);
-  printf ("%.9f\n", energy(NBODIES, bodies));
-  scale_bodies(NBODIES, bodies, DT);
-  for (i = 1; i <= n; i++)  {
-    advance(NBODIES, bodies);
-  }
-  scale_bodies(NBODIES, bodies, RECIP_DT);
-  printf ("%.9f\n", energy(NBODIES, bodies));
-  return 0;
-}
-