**ASP Tutorials - Herong's Tutorial Examples** - Version 5.10, by Dr. Herong Yang

Calculating Prime Numbers

This section provides a tutorial example on testing performance of an ASP script page doing prime number calculations.

The first area I want to test is integer arithmetic calculations. The following ASP page calculates prime number starting from number 3, and repeats the test many times.

<script language="vbscript" runat="server"> ' prime_numbers.asp ' Copyright (c) 1999 by Dr. Herong Yang ' This ASP page calculates prime numbers, and measures its performance. ' dim primes(1000) numberOfTests = 1 numberOfPrimes = 1000 t1 = now for nTest = 1 to numberOfTests ' Getting prime numbers nPrime = 0 i = 2 while nPrime < numberOfPrimes i = i + 1 j = 2 isPrime = true while j<i and isPrime isPrime = i mod j > 0 j = j + 1 wend if isPrime then nPrime = nPrime + 1 primes(nPrime) = i end if wend next t2 = now t = t2 - t1 ' Displaying the results response.write("<html><body>") response.write("<b>Performance Information</b><br/>") response.write("Number of tests = " & numberOfTests & "<br/>") response.write("Time = " & _ Hour(t)&":"&Minute(t)&":"&Second(t) & "<br/>") response.write("<b> " & numberOfPrimes & " prime numbers:</b><br/>") for n = 1 to numberOfPrimes response.write(primes(n) & ", ") next response.write("</body></html>") </script

I run this page, and got the following result. It tells me that the page is working correctly.

Performance Information Number of tests = 1 Time = 0:0:25 First 1000 Prime numbers: 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, ...

I repeated the tests by changes the controlling parameters. The following table shows the results comparing with similar tests I did with other technologies:

Number Number Debug Time Cases of Tests of Primes Mode (Sec) Note 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

Conclusion:

- It is a big surprise to me that the IIS server side debugging mode change makes no difference in performance.
- It is also a big surprise to me that the JSP page performs 100 times better than the ASP page.

*Last update: 2002.*

Table of Contents

ASP (Active Server Pages) Introduction

IIS (Internet Information Services) 5.0

Managing Sessions with and without Cookies

scrrun.dll - Scripting Runtime DLL

Managing Response Header Lines

►Calculation Speed and Response Time

Working with MS Access Database