We have a REST based service that is calling external API and get the response back from that API.
I was filing Capacity request here to make sure our boxes can handle the traffic when we host the service.
So the Capacity guys have asked me -
Any idea what is the estimated CPU and IO time for these calls?
Can anyone tell me in simple language what does these terms means? And what approach should I take to get the rough estimate about the calls?
Thanks for the help.
Update:-
Suppose if this is my program.
public class RestLnPTest {
private final static Logger LOG = Logger.getLogger(NokiaLnPTest.class.getName());
private static int noOfThreads = 10;
public static void main(String[] args) {
ExecutorService service = Executors.newFixedThreadPool(noOfThreads);
try {
for (int i = 0; i < 100 * noOfThreads; i++) {
service.submit(new ThreadTask());
}
service.shutdown();
service.awaitTermination(Long.MAX_VALUE, TimeUnit.DAYS);
} catch (InterruptedException e) {
} catch (Exception e) {
} finally {
logHistogramInfo();
}
}
private static void logHistogramInfo() {
System.out.println(ThreadTask.lookupHistogram);
}
}
class ThreadTask implements Runnable {
public static ConcurrentHashMap<Long, AtomicLong> lookupHistogram = new ConcurrentHashMap<Long, AtomicLong>();
private static final String URL = "SOME_URL";
@Override
public void run() {
RestTemplate restTemplate = new RestTemplate();
long start = System.nanoTime();
String result = restTemplate.getForObject(URL, String.class);
long end = System.nanoTime() - start;
final AtomicLong before = lookupHistogram.putIfAbsent(end / 1000000, new AtomicLong(1L));
if (before != null) {
before.incrementAndGet();
}
}
}
Then how can I figure out CPU and IO times? And currently I am working in Unix Environment.
