mandelbrot C# .NET #5 program
source code
/* The Computer Language Benchmarks Game
https://salsa.debian.org/benchmarksgame-team/benchmarksgame/
started with Java #2 program (Krause/Whipkey/Bennet/AhnTran/Enotus/Stalcup)
adapted for C# by Jan de Vaan
*/
using System;
using System.Diagnostics;
using System.Threading;
using System.IO;
using System.Runtime.CompilerServices;
public class MandelBrot
{
private static int n = 200;
private static byte[][] data;
private static int lineCount = -1;
private static double[] Crb;
private static double[] Cib;
[MethodImpl(MethodImplOptions.AggressiveInlining)]
static int getByte(int x, int y){
int res=0;
for(int i=0;i<8;i+=2){
double Zr1=Crb[x+i];
double Zi1=Cib[y];
double Zr2=Crb[x+i+1];
double Zi2=Cib[y];
int b=0;
int j=49;do{
double nZr1=Zr1*Zr1-Zi1*Zi1+Crb[x+i];
double nZi1=Zr1*Zi1+Zr1*Zi1+Cib[y];
Zr1=nZr1;Zi1=nZi1;
double nZr2=Zr2*Zr2-Zi2*Zi2+Crb[x+i+1];
double nZi2=Zr2*Zi2+Zr2*Zi2+Cib[y];
Zr2=nZr2;Zi2=nZi2;
if(Zr1*Zr1+Zi1*Zi1>4){b|=2;if(b==3)break;}
if(Zr2*Zr2+Zi2*Zi2>4){b|=1;if(b==3)break;}
}while(--j>0);
res=(res<<2)+b;
}
return res^-1;
}
public static void Main (String[] args)
{
if (args.Length > 0) n = Int32.Parse(args[0]);
int lineLen = (n-1)/8 + 1;
data = new byte[n][];
Crb=new double[n+7];
Cib =new double[n+7];
double invN=2.0/n; for(int i=0;i<n;i++){ Cib[i]=i*invN-1.0; Crb[i]=i*invN-1.5; }
var threads = new Thread[Environment.ProcessorCount];
for (int i = 0; i < threads.Length; i++)
{
threads[i] = new Thread(() => {
int y;
while ((y = Interlocked.Increment(ref lineCount)) < n)
{
var buffer = new byte[lineLen];
for (int x = 0; x < lineLen; x++)
{
buffer[x] = (byte) getByte(x*8, y);
}
data[y] = buffer;
}
});
threads[i].Start();
}
foreach (var t in threads) t.Join();
Console.Out.WriteLine("P4\n{0} {0}", n);
var s = Console.OpenStandardOutput();
for (int y = 0; y < n; y++) s.Write(data[y], 0, lineLen);
}
}
notes, command-line, and program output
NOTES:
64-bit Ubuntu quad core
.NET SDK 9.0.100
Host Version: 9.0.0
Commit: 9d5a6a9aa4
<OutputType>Exe
<TargetFramework>net9.0
<ImplicitUsings>enable
<Nullable>enable
<AllowUnsafeBlocks>true
<ServerGarbageCollection>true
<ConcurrentGarbageCollection>true
<PublishAot>false
Wed, 13 Nov 2024 22:49:32 GMT
MAKE:
cp mandelbrot.csharpcore-5.csharpcore Program.cs
cp Include/csharpcore/program.csproj .
mkdir obj
cp Include/csharpcore/project.assets.json ./obj
/opt/src/dotnet-sdk-9.0.100/dotnet build -c Release --use-current-runtime
Determining projects to restore...
/home/dunham/all-benchmarksgame/benchmarksgame_i53330/mandelbrot/tmp/program.csproj : warning NU1900: Error occurred while getting package vulnerability data: Unable to load the service index for source https://api.nuget.org/v3/index.json.
Restored /home/dunham/all-benchmarksgame/benchmarksgame_i53330/mandelbrot/tmp/program.csproj (in 6.31 sec).
/home/dunham/all-benchmarksgame/benchmarksgame_i53330/mandelbrot/tmp/program.csproj : warning NU1900: Error occurred while getting package vulnerability data: Unable to load the service index for source https://api.nuget.org/v3/index.json.
/home/dunham/all-benchmarksgame/benchmarksgame_i53330/mandelbrot/tmp/Program.cs(18,29): warning CS8618: Non-nullable field 'data' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable. [/home/dunham/all-benchmarksgame/benchmarksgame_i53330/mandelbrot/tmp/program.csproj]
/home/dunham/all-benchmarksgame/benchmarksgame_i53330/mandelbrot/tmp/Program.cs(21,29): warning CS8618: Non-nullable field 'Crb' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable. [/home/dunham/all-benchmarksgame/benchmarksgame_i53330/mandelbrot/tmp/program.csproj]
/home/dunham/all-benchmarksgame/benchmarksgame_i53330/mandelbrot/tmp/Program.cs(22,29): warning CS8618: Non-nullable field 'Cib' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable. [/home/dunham/all-benchmarksgame/benchmarksgame_i53330/mandelbrot/tmp/program.csproj]
program -> /home/dunham/all-benchmarksgame/benchmarksgame_i53330/mandelbrot/tmp/bin/Release/net9.0/linux-x64/program.dll
Build succeeded.
/home/dunham/all-benchmarksgame/benchmarksgame_i53330/mandelbrot/tmp/program.csproj : warning NU1900: Error occurred while getting package vulnerability data: Unable to load the service index for source https://api.nuget.org/v3/index.json.
/home/dunham/all-benchmarksgame/benchmarksgame_i53330/mandelbrot/tmp/program.csproj : warning NU1900: Error occurred while getting package vulnerability data: Unable to load the service index for source https://api.nuget.org/v3/index.json.
/home/dunham/all-benchmarksgame/benchmarksgame_i53330/mandelbrot/tmp/Program.cs(18,29): warning CS8618: Non-nullable field 'data' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable. [/home/dunham/all-benchmarksgame/benchmarksgame_i53330/mandelbrot/tmp/program.csproj]
/home/dunham/all-benchmarksgame/benchmarksgame_i53330/mandelbrot/tmp/Program.cs(21,29): warning CS8618: Non-nullable field 'Crb' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable. [/home/dunham/all-benchmarksgame/benchmarksgame_i53330/mandelbrot/tmp/program.csproj]
/home/dunham/all-benchmarksgame/benchmarksgame_i53330/mandelbrot/tmp/Program.cs(22,29): warning CS8618: Non-nullable field 'Cib' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable. [/home/dunham/all-benchmarksgame/benchmarksgame_i53330/mandelbrot/tmp/program.csproj]
5 Warning(s)
0 Error(s)
Time Elapsed 00:00:11.50
13.48s to complete and log all make actions
COMMAND LINE:
./bin/Release/net9.0/linux-x64/program 16000
(BINARY) PROGRAM OUTPUT NOT SHOWN