Selenium Grid Parallel Test Is Not Work Parallel

Hello I have two node which names are Node1 and Node2 and I do this tests in one computer. My problem is Node1 and Node2 tests doesn't work same time so They are not parallel. Thus when Node1 is finish after Node2 test start but I don't want it , I want them start together.I have already tried parallel="tests" and parallel="classes" in the TestNG.xml file.

This is my Node1.java file:

package grid;

import java.net.MalformedURLException;
import java.net.URL;
import java.util.concurrent.TimeUnit;
import org.openqa.selenium.By;
import org.openqa.selenium.Platform;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.remote.DesiredCapabilities;
import org.openqa.selenium.remote.RemoteWebDriver;
import org.testng.annotations.Test;

public class Node1 {
    WebDriver driver;
    String nodeUrl;
  @Test
  public void f() {
        try {
            //configuration
            nodeUrl= "http://192.168.56.1:5555/wd/hub";
            DesiredCapabilities capabilities = DesiredCapabilities.chrome();
            capabilities.setBrowserName("chrome");
            capabilities.setPlatform(Platform.WIN10);
            driver = new RemoteWebDriver(new URL(nodeUrl), capabilities);

            //test scripts
            driver.manage().deleteAllCookies();
            driver.manage().window().maximize();
            driver.manage().timeouts().implicitlyWait(30, TimeUnit.SECONDS);
            driver.manage().timeouts().pageLoadTimeout(45, TimeUnit.SECONDS);
            driver.get("https://www.amazon.com/");
            driver.findElement(By.linkText("Today's Deals")).click();
            driver.findElement(By.linkText("Gift Cards")).click();
            driver.findElement(By.linkText("Today's Deals")).click();
            driver.findElement(By.linkText("Gift Cards")).click();
            driver.findElement(By.linkText("Today's Deals")).click();
        } 
        catch (MalformedURLException e) {       
            e.printStackTrace();            
        }
  }
}

This is my Node2.java file :

package grid;

import java.net.MalformedURLException;
import java.net.URL;
import java.util.concurrent.TimeUnit;
import org.openqa.selenium.By;
import org.openqa.selenium.Platform;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.remote.DesiredCapabilities;
import org.openqa.selenium.remote.RemoteWebDriver;
import org.testng.annotations.Test;

public class Node2 {    
    WebDriver driver;
    String nodeUrl;
  @Test
  public void f() {
        try {
            //configuration
            nodeUrl= "http://192.168.56.1:5555/wd/hub";
            DesiredCapabilities capabilities = DesiredCapabilities.chrome();
            capabilities.setBrowserName("chrome");
            capabilities.setPlatform(Platform.WIN10);
            driver = new RemoteWebDriver(new URL(nodeUrl), capabilities);

            //test scripts
            driver.manage().deleteAllCookies();
            driver.manage().window().maximize();
            driver.manage().timeouts().implicitlyWait(30, TimeUnit.SECONDS);
            driver.manage().timeouts().pageLoadTimeout(45, TimeUnit.SECONDS);
            driver.get("https://www.google.com/");
        } 
        catch (MalformedURLException e) {       
            e.printStackTrace();            
        }
  }
}

And this is my TestNG.xml file :

<!DOCTYPE suite SYSTEM "http://testng.org/testng-1.0.dtd" >

<suite name="Test Grid" parallel="tests">
    <test name="Test Node1">
        <classes>
            <class name="grid.Node1" />
        </classes>
    </test>
    <test name="Test Node2">
        <classes>
            <class name="grid.Node2" />
        </classes>
    </test>
</suite>