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(asp.net) un-managed code

Posted on 2008-06-10
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Last Modified: 2010-04-15
I'm working on a asp.net app that's eCommerece. I downloaded a dotnet profiler and ran the app.

The bottleneck shows at an ASHX page and there's a routine in there. It calls database stuff.

But my question is, howcome this is unmanaged code and is unmanaged code bad? ** the profler shows this functon as unmanaged**

This is the code below:


using System;
using System.Web;
using System.Web.UI;
 
using System.Diagnostics;
 
 
using DX.Catalog;
 
 
    public class CategoryUrl : IHttpHandler, System.Web.SessionState.IRequiresSessionState
    {
        public void ProcessRequest(HttpContext context)
        {
            
 
            string destinationPage = "~/ListProdcuts.aspx";
 
   
 
            if (string.IsNullOrEmpty(context.Request.QueryString["Tail"]))
            {
                Category category = Category.GetById(new Guid(context.Request.QueryString["CategoryId"]), true);
                string landingPage = "~/Categs/" + category.TreePath.Replace("/", ".") + ".aspx";
 
                if (System.IO.File.Exists(context.Server.MapPath(landingPage)))
                {
                    destinationPage = landingPage;
                }
            }
 
            context.RewritePath(destinationPage, context.Request.PathInfo, context.Request.Url.Query.TrimStart('?'), false);
 
            IHttpHandler page = PageParser.GetCompiledPageInstance(destinationPage, context.Server.MapPath(destinationPage), context);
            page.ProcessRequest(context);
        }
 
        public bool IsReuse
        {
            get
            {
                return true;
            }
        }
    }

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Question by:Camillia
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Expert Comment

by:raterus
ID: 21752724
Any .Net code you write is managed code, however, you can make calls to unmanaged code.  My guess is some of these methods which you haven't posted more detail on make calls to unmanaged methods, specifically the category object.

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by:Camillia
ID: 21752830
ah, so I need to trace that category object? so this ASHX itself is managed but it calls other methods that are unmanaged...

unmanaged code is bad for performance?
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Accepted Solution

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raterus earned 500 total points
ID: 21752876
Unmanaged code is not bad, it just doesn't run under the .Net CLR (aka. Virtual Machine).  Unmanaged code talks directly to the computers processor, while .Net (managed) code talks to the CLR, which talks to the computer's processor.  Technically, unmanaged code has the potential to run more efficiently than .Net code since there isn't this intermediate step :-)
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LVL 7

Author Comment

by:Camillia
ID: 21752944
thanks...makes sense. I will need to look at this bottleneck. Have you used MyGeneration database wrapper...they use it a lot in this app..maybe that's an issue...but good to know I can rule some things out.
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Expert Comment

by:raterus
ID: 21752973
Sorry, not familiar with that one :-)
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Author Comment

by:Camillia
ID: 21753417
thanks for your help. Will leave this open for now and see if anyone has anything else to add.
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Author Comment

by:Camillia
ID: 21754772
You're right , something's going on with that Category object.

Let me ask you this and then I will close question.

The profiler shows that that object consumes 212,206 byes of memory. Total byte allocated for this object is 244,392 bytes That's not good, is it? dont think it is ..
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Expert Comment

by:raterus
ID: 21754925
Probably out of my expertise as far as a solid answer, but I do know a program can request a large amount of memory to be reserved for it's execution, memory it may never use.  This might help explain your memory discrepancy.

I really only remember reading this once when I looked up virtual memory, wondering why it's even needed these days.  Seems windows is smart and offloads this reserved memory to a hard-disk until it's actually used in the program.
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