[Mono-bugs] [Bug 535425] New: Slow performance of <string>.Contains(), <string>.BeginsWith etc. Compared to MS'.NET runtime

[bugzilla_noreply at novell.com]

http://bugzilla.novell.com/show_bug.cgi?id=535425


           Summary: Slow performance of <string>.Contains(),
                    <string>.BeginsWith etc. Compared to MS'.NET runtime
    Classification: Mono
           Product: Mono: Runtime
           Version: 2.4.x
          Platform: x86
        OS/Version: Windows Vista
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: misc
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: arenvillanueva at yomogi-soft.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---


Created an attachment (id=315839)
 --> (http://bugzilla.novell.com/attachment.cgi?id=315839)
Edict dictionary File

User-Agent:       Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.0.13)
Gecko/2009080315 Linux Mint/7 (Gloria) Firefox/3.0.13

The following code:
===============================================

using System;

namespace Hmm

{

    class MainClass

    {

        public static void Main (string[] args)

        {

            String[] Dict = System.IO.File.ReadAllLines("edict",
System.Text.Encoding.GetEncoding(51932));



            DateTime startTime = DateTime.Now;



            for (uint i = 0; i < 50; ++i)

            {

                foreach (String temp in Dict)

                {

                    if (temp.Contains("today"))

                    {

                        Console.WriteLine(temp);

                    }

                }

            }



            TimeSpan duration = DateTime.Now - startTime;



            Console.WriteLine(duration.Seconds.ToString());

        }

    }

}

======================================================

On MS.NET framework, execution time is 2 seconds, with the application
reporting 2 seconds.

On mono framework, execution time is approximately 1 minute 20 seconds with the
application reporting 20 seconds.


the edict file is attached to this bug report.

Reproducible: Always

Steps to Reproduce:
1. compile program
2. run on ms.net framework
3. run on mono framework
Actual Results:  
On MS.NET framework, execution time is 2 seconds, with the application
reporting 2 seconds.

On mono framework, execution time is approximately 1 minute 20 seconds with the
application reporting 20 seconds.

Expected Results:  
I expected the execution times to be similar on both frameworks, not orders of
magnitudes different.

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