**ASP Tutorials - Herong's Tutorial Examples** - v5.10, 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.

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