Created
June 23, 2019 18:20
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Branch Prediction Example Java
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| import java.util.Arrays; | |
| import java.util.Random; | |
| public class Main { | |
| public static void main(String[] args) { | |
| // Generate data | |
| int arraySize = 32768; | |
| int data[] = new int[arraySize]; | |
| Random rnd = new Random(0); | |
| for (int c = 0; c < arraySize; ++c) | |
| data[c] = rnd.nextInt() % 256; | |
| // With this, the next loop runs faster | |
| Arrays.sort(data); | |
| // Test | |
| long start = System.nanoTime(); | |
| long sum = 0; | |
| for (int i = 0; i < 100000; ++i) { | |
| // Primary loop | |
| for (int c = 0; c < arraySize; ++c) { | |
| if (data[c] >= 128) | |
| sum += data[c]; | |
| } | |
| } | |
| System.out.println((System.nanoTime() - start) / 1000000000.0); | |
| System.out.println("sum: " + sum); | |
| } | |
| } |
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