performance measurements
Each table row shows performance measurements for this C# Mono program with a particular command-line input value N.
| N | CPU secs | Elapsed secs | Memory KB | Code B | ≈ CPU Load |
|---|---|---|---|---|---|
| 500,000 | 0.38 | 0.38 | 308 | 1289 | 5% 0% 0% 100% |
| 5,000,000 | 2.90 | 2.91 | 14,048 | 1289 | 1% 1% 0% 100% |
| 50,000,000 | 28.19 | 28.20 | 14,052 | 1289 | 0% 0% 0% 100% |
Read the ↓ make, command line, and program output logs to see how this program was run.
Read n-body benchmark to see what this program should do.
notes
Mono JIT compiler version 3.0.3 (tarball Tue Feb 12 10:56:44 PST 2013)
LLVM: yes(3.2svn-mono)
n-body C# Mono #6 program source code
/* The Computer Language Benchmarks Game http://benchmarksgame.alioth.debian.org/ contributed by Mark C. Lewis modified slightly by Chad Whipkey modified by Robert McKee */ using System; class NBody { public static void Main(String[] args) { int n = 10000; if (args.Length > 0) n = Int32.Parse(args[0]); NBodySystem bodies = new NBodySystem(); Console.WriteLine("{0:f9}", bodies.Energy()); for (int i = 0; i < n; i++) bodies.Advance(0.01); Console.WriteLine("{0:f9}", bodies.Energy()); } } class NBodySystem { const double PI = Math.PI; const double SOLAR_MASS = 4 * PI * PI; const double DAYS_PER_YEAR = 365.24; private Body[] bodies; const int bl = 5; public NBodySystem() { bodies = new Body[] { new Body() { // Sun mass = SOLAR_MASS, }, new Body() { // Jupiter x = 4.84143144246472090e+00, y = -1.16032004402742839e+00, z = -1.03622044471123109e-01, vx = 1.66007664274403694e-03 * DAYS_PER_YEAR, vy = 7.69901118419740425e-03 * DAYS_PER_YEAR, vz = -6.90460016972063023e-05 * DAYS_PER_YEAR, mass = 9.54791938424326609e-04 * SOLAR_MASS, }, new Body() { // Saturn x = 8.34336671824457987e+00, y = 4.12479856412430479e+00, z = -4.03523417114321381e-01, vx = -2.76742510726862411e-03 * DAYS_PER_YEAR, vy = 4.99852801234917238e-03 * DAYS_PER_YEAR, vz = 2.30417297573763929e-05 * DAYS_PER_YEAR, mass = 2.85885980666130812e-04 * SOLAR_MASS, }, new Body() { // Uranus x = 1.28943695621391310e+01, y = -1.51111514016986312e+01, z = -2.23307578892655734e-01, vx = 2.96460137564761618e-03 * DAYS_PER_YEAR, vy = 2.37847173959480950e-03 * DAYS_PER_YEAR, vz = -2.96589568540237556e-05 * DAYS_PER_YEAR, mass = 4.36624404335156298e-05 * SOLAR_MASS, }, new Body() { // Neptune x = 1.53796971148509165e+01, y = -2.59193146099879641e+01, z = 1.79258772950371181e-01, vx = 2.68067772490389322e-03 * DAYS_PER_YEAR, vy = 1.62824170038242295e-03 * DAYS_PER_YEAR, vz = -9.51592254519715870e-05 * DAYS_PER_YEAR, mass = 5.15138902046611451e-05 * SOLAR_MASS, }, }; double px = 0; double py = 0; double pz = 0; foreach (Body body in bodies) { px += body.vx * body.mass; py += body.vy * body.mass; pz += body.vz * body.mass; } var sol = bodies[0]; sol.vx = -px / SOLAR_MASS; sol.vy = -py / SOLAR_MASS; sol.vz = -pz / SOLAR_MASS; } public void Advance(double dt) { double dx, dy, dz, distance, mag, bim, bjm; double x, y, z; for (int i = 0; i < bl; i++) { Body bi = bodies[i]; x = bi.x; y = bi.y; z = bi.z; for (int j = i + 1; j < bl; j++) { Body bj = bodies[j]; dx = x - bj.x; dy = y - bj.y; dz = z - bj.z; distance = Math.Sqrt(dx * dx + dy * dy + dz * dz); mag = dt / (distance * distance * distance); bim = bi.mass * mag; bjm = bj.mass * mag; bi.vx -= dx * bjm; bi.vy -= dy * bjm; bi.vz -= dz * bjm; bj.vx += dx * bim; bj.vy += dy * bim; bj.vz += dz * bim; } bi.x = x + dt * bi.vx; bi.y = y + dt * bi.vy; bi.z = z + dt * bi.vz; } } public double Energy() { double dx, dy, dz, distance; double e = 0; for (int i = 0; i < bl; i++) { Body bi = bodies[i]; e += 0.5 * bi.mass * (bi.vx * bi.vx + bi.vy * bi.vy + bi.vz * bi.vz); for (int j = i + 1; j < bl; j++) { Body bj = bodies[j]; dx = bi.x - bj.x; dy = bi.y - bj.y; dz = bi.z - bj.z; distance = Math.Sqrt(dx * dx + dy * dy + dz * dz); e -= (bi.mass * bj.mass) / distance; } } return e; } } class Body { public double x, y, z, vx, vy, vz, mass; }
make, command-line, and program output logs
Tue, 12 Feb 2013 20:56:24 GMT MAKE: mv nbody.csharp-6.csharp nbody.csharp-6.cs /usr/local/bin/mcs -r:/usr/local/lib/mono/4.5/Mono.Simd.dll -optimize+ -platform:x86 -out:nbody.csharp-6.csharp_run nbody.csharp-6.cs rm nbody.csharp-6.cs 0.24s to complete and log all make actions COMMAND LINE: /usr/local/bin/mono --llvm nbody.csharp-6.csharp_run 50000000 PROGRAM OUTPUT: -0.169075164 -0.169059907 <premain>: CommandLine Error: Argument 'misched' defined more than once! <premain>: CommandLine Error: Argument 'print-machineinstrs' defined more than once! -simplifycfg: CommandLine Error: Argument 'misched' defined more than once! -simplifycfg: CommandLine Error: Argument 'print-machineinstrs' defined more than once!