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DivideAndConquer.cs
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DivideAndConquer.cs
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using System.Diagnostics;
namespace HelloWorld
{
class Program
{
static byte[] val = new byte[500000000];
static long[] segVal = new long[Environment.ProcessorCount];
static int segSize = val.Length / segVal.Length;
static void GenerateVal()
{
var rand = new Random(1000);
for (int i = 0; i < val.Length; i++)
{
val[i] = (byte)rand.Next(10);
}
}
static void SegSum(object id)
{
long res = 0;
int idN = (int)id;
for (int i = idN * segSize; i < (idN+1) * segSize; i++)
{
res += val[i];
}
segVal[idN] = res;
}
static void Main(string[] args)
{
GenerateVal();
Stopwatch watch = new Stopwatch();
watch.Start();
long sum = 0;
for (int i = 0; i < val.Length; i++)
{
sum += val[i];
}
watch.Stop();
Console.WriteLine("Sum without threading is : " + sum +
". And time taken is " + watch.Elapsed);
watch.Reset();
watch.Start();
Thread[] threads = new Thread[Environment.ProcessorCount];
for (int i = 0;i < segVal.Length; i++)
{
threads[i] = new Thread(SegSum);
threads[i].Start(i);
}
for (int i = 0; i < segVal.Length; i++)
{
threads[i].Join();
}
long res = 0;
for (int i = 0; i < segVal.Length; i++)
{
res += segVal[i];
}
watch.Stop();
Console.WriteLine("Sum of all values is " + res +
". And Time taken is " + watch.Elapsed);
}
}
}