JavaSource/src/test/java/Test.java · wolf/ProjectStudy

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ProjectStudy

JavaSource

src

test

java

Test.java

Test.java 1.84 KB

/**
 * JavaSource
 *
 * @author wliduo[i@dolyw.com]
 * @date 2020年4月28日 11:04
 */
public class Test {

private static final int ITERATIONS = Integer.MAX_VALUE;
 private static final int ITEMS = 1 << 24;
 private static final int MASK = ITEMS - 1;

private static final byte[] arrayA = new byte[ITEMS];
 private static final byte[] arrayB = new byte[ITEMS];
 private static final byte[] arrayC = new byte[ITEMS];
 private static final byte[] arrayD = new byte[ITEMS];
 private static final byte[] arrayE = new byte[ITEMS];
 private static final byte[] arrayF = new byte[ITEMS];

public static void main(final String[] args) {

for (int i = 1; i <= 3; i++) {
 System.out.println(i + " SingleLoop duration (ns) = " + runCaseOne());
 System.out.println(i + " SplitLoop duration (ns) = " + runCaseTwo());
 }
 }

public static long runCaseOne() {
 long start = System.nanoTime();
 int i = ITERATIONS;

while (--i != 0) {
 int slot = i & MASK;
 byte b = (byte) i;
 arrayA[slot] = b;
 arrayB[slot] = b;
 arrayC[slot] = b;
 arrayD[slot] = b;
 arrayE[slot] = b;
 arrayF[slot] = b;
 }
 return System.nanoTime() - start;
 }

public static long runCaseTwo() {
 long start = System.nanoTime();
 int i = ITERATIONS;
 while (--i != 0) {
 int slot = i & MASK;
 byte b = (byte) i;
 arrayA[slot] = b;
 arrayB[slot] = b;
 arrayC[slot] = b;
 }
 i = ITERATIONS;
 while (--i != 0) {
 int slot = i & MASK;
 byte b = (byte) i;
 arrayD[slot] = b;
 arrayE[slot] = b;
 arrayF[slot] = b;
 }
 return System.nanoTime() - start;
 }

}

一键复制编辑原始数据按行查看历史

随心提交于 2020年05月06日 16:33 +08:00 . Java并发,集合学习

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/**
 * JavaSource
 *
 * @author wliduo[i@dolyw.com]
 * @date 2020年4月28日 11:04
 */
public class Test {

 private static final int ITERATIONS = Integer.MAX_VALUE;
 private static final int ITEMS = 1 << 24;
 private static final int MASK = ITEMS - 1;

 private static final byte[] arrayA = new byte[ITEMS];
 private static final byte[] arrayB = new byte[ITEMS];
 private static final byte[] arrayC = new byte[ITEMS];
 private static final byte[] arrayD = new byte[ITEMS];
 private static final byte[] arrayE = new byte[ITEMS];
 private static final byte[] arrayF = new byte[ITEMS];

 public static void main(final String[] args) {

 for (int i = 1; i <= 3; i++) {
 System.out.println(i + " SingleLoop duration (ns) = " + runCaseOne());
 System.out.println(i + " SplitLoop duration (ns) = " + runCaseTwo());
 }
 }

 public static long runCaseOne() {
 long start = System.nanoTime();
 int i = ITERATIONS;

 while (--i != 0) {
 int slot = i & MASK;
 byte b = (byte) i;
 arrayA[slot] = b;
 arrayB[slot] = b;
 arrayC[slot] = b;
 arrayD[slot] = b;
 arrayE[slot] = b;
 arrayF[slot] = b;
 }
 return System.nanoTime() - start;
 }

 public static long runCaseTwo() {
 long start = System.nanoTime();
 int i = ITERATIONS;
 while (--i != 0) {
 int slot = i & MASK;
 byte b = (byte) i;
 arrayA[slot] = b;
 arrayB[slot] = b;
 arrayC[slot] = b;
 }
 i = ITERATIONS;
 while (--i != 0) {
 int slot = i & MASK;
 byte b = (byte) i;
 arrayD[slot] = b;
 arrayE[slot] = b;
 arrayF[slot] = b;
 }
 return System.nanoTime() - start;
 }

}