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JSP Performance
Part:
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Calculating Prime Numbers
The first area I want to test for performance is integer arithmetic calculations.
The following JSP page calculates prime number starting from number 3, and repeats
the test many times.
<?xml version="1.0"?>
<jsp:root xmlns:jsp="http://java.sun.com/JSP/Page" version="1.2">
<!-- PrimeNumbers.jsp
Copyright (c) 2003 by Dr. Herong Yang
-->
<jsp:directive.page contentType="text/html"/>
<jsp:directive.page import="java.util.*"/>
<jsp:scriptlet><![CDATA[
int[] primes = new int[1000];
int numberOfTests = 100;
int numberOfPrimes = 1000;
long t1 = System.currentTimeMillis();
for (int nTest=1; nTest<=numberOfTests; nTest++) {
// Getting prime numbers
int nPrime = 0;
int i = 2;
while (nPrime < numberOfPrimes) {
i = i + 1;
int j = 2;
boolean isPrime = true;
while (j<i && isPrime) {
isPrime = i % j > 0;
j = j + 1;
}
if (isPrime) {
nPrime = nPrime + 1;
primes[nPrime-1] = i;
}
}
}
long t2 = System.currentTimeMillis();
long t = t2 - t1;
// Displaying the results
out.println("<html><body>");
out.println("<b>Performace Information:</b><br/>");
out.println("Number of tests = " + numberOfTests + "<br/>");
out.println("Time = " + (t/1000) + " seconds.<br/>");
out.println("<b>" + numberOfPrimes + " prime numbers:</b><br/>");
for (int n = 1; n <= numberOfPrimes; n++) {
out.println(primes[n-1] + ", ");
}
out.println("</body></html>");
]]></jsp:scriptlet>
</jsp:root>
I run this page, and got the following result. It tells me the page is working correctly.
Performace Information
Number of tests = 1
Time = 0 seconds
First 1000 Prime numbers:
3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, ...
By changing the controlling parameters, I was able to get some results:
Number Number Debug Time
Cases of Tests of Primes Mode (sec) Notes
1. 1 1000 Yes 25 ASP with IIS 5.0
2. 1 1000 No 25 ASP with IIS 5.0
3. 1 1000 ? 0 JSP with Tomcat 4.1.18
4. 10 1000 ? 2 JSP with Tomcat 4.1.18
5. 100 1000 ? 22 JSP with Tomcat 4.1.18
6. 100 1000 ? 21 JVM HotSpot 1.3.1
So this tells us that JSP pages are 100 times faster than ASP pages for
integer calculations.
(Continued on next part...)
Part:
1
2
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