Concurrent AJAX calls in Jmeter - jmeter

Question

How can we trigger concurrent requests in JMeter...
I am not talking about the non -html elements (where we have a provision in jmeter to download them concurrently).
I have few AJAX calls to be downloaded concurrently...

Answer 1

As per JMeter 3.0 there is no suitable Test Elements, you will need to:
go for JSR223 Sampler + Groovy language and Apache HTTP Components (which are parts of JMeter anyway)
or develop your custom sampler to overcome JMeter thread group limitation and kick off extra threads to execute AJAX calls.
Example JSR223 Sampler Code:
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors; // necessary imports
List<String> urls = new ArrayList<String>(); // initialize array of URLs
Collections.addAll(urls,args); // read URLs from "Parameters" input and add them to array
ExecutorService pool = Executors.newFixedThreadPool(urls.size()); // initialize pool of Future Tasks with number of threads equal to size of URLs provided
for (String url : urls) { // for each URL from list
final String currentURL = url;
pool.submit(new Runnable() { // Sumbit a new thread which will execute GET request
#Override
public void run() {
try {
HttpClient client = new DefaultHttpClient(); // Use Apache Commons HTTPClient to perform GET request
HttpGet get = new HttpGet(currentURL);
HttpResponse response = client.execute(get);
HttpEntity entity = response.getEntity();
EntityUtils.consume(entity);
} catch (Exception ex) {
ex.printStackTrace();
}
}
});
}
pool.shutdown(); // shut down thread pool
More details: How to Load Test AJAX/XHR Enabled Sites With JMeter