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performance puzzle

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  • S Super Lloyd

    I already posted the source code: http://www.codeproject.com/Lounge.aspx?msg=3657380#xx3657380xx[^] As to the disassembly, err.... well, ok, but I have to cut the C++ version as it huge loads of stuff coming the #include(s), hopefully I'll cut it right ... disassembled JITted C#

    --- C:\Dev\Test\Performance\CSperf\Program.cs ----------------------------------
    if (args.Length != 1)
    00000000 push ebp
    00000001 mov ebp,esp
    00000003 push edi
    00000004 push esi
    00000005 sub esp,6Ch
    00000008 mov esi,ecx
    0000000a lea edi,[ebp-74h]
    0000000d mov ecx,1Bh
    00000012 xor eax,eax
    00000014 rep stos dword ptr es:[edi]
    00000016 mov ecx,esi
    00000018 mov dword ptr [ebp-0Ch],esp
    0000001b mov dword ptr [ebp-74h],2941BF9Bh
    00000022 mov dword ptr [ebp-60h],ecx
    00000025 cmp dword ptr ds:[001B7CB8h],0
    0000002c je 00000033
    0000002e call 62889E21
    00000033 xor edx,edx
    00000035 mov dword ptr [ebp-28h],edx
    00000038 xor edx,edx
    0000003a mov dword ptr [ebp-1Ch],edx
    0000003d xor edx,edx
    0000003f mov dword ptr [ebp-24h],edx
    00000042 xor edx,edx
    00000044 mov dword ptr [ebp-2Ch],edx
    00000047 xor edx,edx
    00000049 mov dword ptr [ebp-20h],edx
    0000004c xor edx,edx
    0000004e mov dword ptr [ebp-10h],edx
    00000051 mov eax,dword ptr [ebp-60h]
    00000054 cmp dword ptr [eax+4],1
    00000058 je 0000006B
    {
    Console.WriteLine("Usage:\tsieve [iterations]");
    0000005a mov ecx,dword ptr ds:[03832088h]
    00000060 call 62202DB4
    return;
    00000065 nop
    00000066 jmp 0000019A
    }

    		int NUM = int.Parse(args\[0\]);
    

    0000006b mov eax,dword ptr [ebp-60h]
    0000006e cmp dword ptr [eax+4],0
    00000072 ja 00000079
    00000074 call 6288BA5C
    00000079 mov ecx,dword ptr [eax+0Ch]
    0000007c call 6220EAC4
    00000081 mov dword ptr [ebp-38h],eax
    00000084 mov eax,dword ptr [ebp-38h]
    00000087 mov dword ptr [ebp-10h],eax
    var t0 = DateTime.Now;
    0000008a lea ecx,[ebp-40h]
    0000008d call 61D07768

    L Offline
    L Offline
    Lost User
    wrote on last edited by
    #36

    Are you sure you got the optimized version of the C# code? I mean, yea it's supposed to be lame, but it's worse than I expected

    S 1 Reply Last reply
    0
    • R realJSOP

      Super Lloyd wrote:

      Well, any C# performance tip is welcome!

      Uncle John's Handy C# Performance Tip #237: Convert the code to unmanaged C++.

      .45 ACP - because shooting twice is just silly
      -----
      "Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
      -----
      "The staggering layers of obscenity in your statement make it a work of art on so many levels." - J. Jystad, 2001

      S Offline
      S Offline
      Super Lloyd
      wrote on last edited by
      #37

      Well it's only tip #237, so I guess it's not the 1st thing I should rush to do! :)

      A train station is where the train stops. A bus station is where the bus stops. On my desk, I have a work station.... _________________________________________________________ My programs never have bugs, they just develop random features.

      P D 2 Replies Last reply
      0
      • M Mechanical

        Super Lloyd wrote:

        any C# performance tip is welcome!

        That is like looking for performance from Java: You won't get it. If you need (or want) performance, don't do retards' languages. I know this thread isn't meant to incite hatred against retards' languages.

        NULL

        D Offline
        D Offline
        Derek Viljoen
        wrote on last edited by
        #38

        Mechanical, I checked your profile. You've never authored an article, posted a snippet, entered a blog post, or otherwise shared any original thought, except to snipe at other people's comments on the message boards. In other words, you have yet to provide any empirical evidence for your worth to this site. No be a good boy and go away, please.

        M 1 Reply Last reply
        0
        • M Mechanical

          My statement was made because I had to maintain some Native code I wrote some years ago. I realized how retarded I had become doing retards' languages.

          peterchen wrote:

          Are you open to evidence for my statement

          I'm all ears (big, pointy ears).

          NULL

          P Offline
          P Offline
          peterchen
          wrote on last edited by
          #39

          The Raymond Chen vs. Rico Mariani competition comes to mind. Clickety[^] Clickety-Click[^] The final result, at first look, supports your statement: The C++ version completed before the .NET application even did load. However, when you look at the history and details, you see that the road to the superfast C++ application was a rocky one, introducing subtle bugs and requiring a very experienced developer to counter the rather simple improvements to the C# solution.


          With extensions like LINQ, Closures, Lambdas, Generics and some syntactic sugar, C# has become a rather complex and powerful language. It's complex and powerful in a different sense than C++, but still.

          Agh! Reality! My Archnemesis![^]
          | FoldWithUs! | sighist | WhoIncludes - Analyzing C++ include file hierarchy

          modified on Friday, November 5, 2010 11:17 AM

          1 Reply Last reply
          0
          • S Super Lloyd

            Well it's only tip #237, so I guess it's not the 1st thing I should rush to do! :)

            A train station is where the train stops. A bus station is where the bus stops. On my desk, I have a work station.... _________________________________________________________ My programs never have bugs, they just develop random features.

            P Offline
            P Offline
            peterchen
            wrote on last edited by
            #40

            Hey! Take stop reading my mind!

            Agh! Reality! My Archnemesis![^]
            | FoldWithUs! | sighist | WhoIncludes - Analyzing C++ include file hierarchy

            1 Reply Last reply
            0
            • D DaveAuld

              Nothing to do with the optimisation, but what about using the StopWatch class instead of datetime? Start the stop watch immediately before you enter the loop, and then stop it as soon as the loop exists.

              Dave Find Me On: Web|Facebook|Twitter|LinkedIn CPRepWatcher now available as Packaged Chrome Extension, visit my articles for link.

              L Offline
              L Offline
              Luc Pattyn
              wrote on last edited by
              #41

              I agree. On my machine 10 iterations take 0.5 milliseconds, which DateTime.Now can't catch at all. :)

              Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles] Nil Volentibus Arduum

              Please use <PRE> tags for code snippets, they preserve indentation, and improve readability.

              1 Reply Last reply
              0
              • S Super Lloyd

                I already posted the source code: http://www.codeproject.com/Lounge.aspx?msg=3657380#xx3657380xx[^] As to the disassembly, err.... well, ok, but I have to cut the C++ version as it huge loads of stuff coming the #include(s), hopefully I'll cut it right ... disassembled JITted C#

                --- C:\Dev\Test\Performance\CSperf\Program.cs ----------------------------------
                if (args.Length != 1)
                00000000 push ebp
                00000001 mov ebp,esp
                00000003 push edi
                00000004 push esi
                00000005 sub esp,6Ch
                00000008 mov esi,ecx
                0000000a lea edi,[ebp-74h]
                0000000d mov ecx,1Bh
                00000012 xor eax,eax
                00000014 rep stos dword ptr es:[edi]
                00000016 mov ecx,esi
                00000018 mov dword ptr [ebp-0Ch],esp
                0000001b mov dword ptr [ebp-74h],2941BF9Bh
                00000022 mov dword ptr [ebp-60h],ecx
                00000025 cmp dword ptr ds:[001B7CB8h],0
                0000002c je 00000033
                0000002e call 62889E21
                00000033 xor edx,edx
                00000035 mov dword ptr [ebp-28h],edx
                00000038 xor edx,edx
                0000003a mov dword ptr [ebp-1Ch],edx
                0000003d xor edx,edx
                0000003f mov dword ptr [ebp-24h],edx
                00000042 xor edx,edx
                00000044 mov dword ptr [ebp-2Ch],edx
                00000047 xor edx,edx
                00000049 mov dword ptr [ebp-20h],edx
                0000004c xor edx,edx
                0000004e mov dword ptr [ebp-10h],edx
                00000051 mov eax,dword ptr [ebp-60h]
                00000054 cmp dword ptr [eax+4],1
                00000058 je 0000006B
                {
                Console.WriteLine("Usage:\tsieve [iterations]");
                0000005a mov ecx,dword ptr ds:[03832088h]
                00000060 call 62202DB4
                return;
                00000065 nop
                00000066 jmp 0000019A
                }

                		int NUM = int.Parse(args\[0\]);
                

                0000006b mov eax,dword ptr [ebp-60h]
                0000006e cmp dword ptr [eax+4],0
                00000072 ja 00000079
                00000074 call 6288BA5C
                00000079 mov ecx,dword ptr [eax+0Ch]
                0000007c call 6220EAC4
                00000081 mov dword ptr [ebp-38h],eax
                00000084 mov eax,dword ptr [ebp-38h]
                00000087 mov dword ptr [ebp-10h],eax
                var t0 = DateTime.Now;
                0000008a lea ecx,[ebp-40h]
                0000008d call 61D07768

                D Offline
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                Daniel Grunwald
                wrote on last edited by
                #42

                You need to be careful, the JIT will turn off optimizations when running inside the Visual Studio debugger (even in release builds!). To get the optimized JITted assembly code, you need to run your program from the command line, then attach the debugger to the running process, and click Break.

                S 1 Reply Last reply
                0
                • S Super Lloyd

                  yes, do post back please! :P

                  A train station is where the train stops. A bus station is where the bus stops. On my desk, I have a work station.... _________________________________________________________ My programs never have bugs, they just develop random features.

                  S Offline
                  S Offline
                  Simon P Stevens
                  wrote on last edited by
                  #43

                  Well I've written a C# version that runs 15-20% faster that your original on my PC. It doesn't use unsafe either. But I don't think you'll like it.

                  private static void SafeTest_Improved1(string[] args)
                  {
                  int NUM = int.Parse(args[0]);
                  int end = 8193;
                  var primes = new byte[8193]{
                  1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
                  1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
                  1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
                  1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
                  1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
                  1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
                  1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
                  1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
                  1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
                  1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
                  1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
                  1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
                  1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
                  1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
                  1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
                  1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
                  1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
                  1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
                  1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
                  1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,

                      1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1
                  
                  S 1 Reply Last reply
                  0
                  • D Daniel Grunwald

                    You need to be careful, the JIT will turn off optimizations when running inside the Visual Studio debugger (even in release builds!). To get the optimized JITted assembly code, you need to run your program from the command line, then attach the debugger to the running process, and click Break.

                    S Offline
                    S Offline
                    Super Lloyd
                    wrote on last edited by
                    #44

                    To test the speed I was running each program from the command line! ^_^

                    A train station is where the train stops. A bus station is where the bus stops. On my desk, I have a work station.... _________________________________________________________ My programs never have bugs, they just develop random features.

                    D 1 Reply Last reply
                    0
                    • S Super Lloyd

                      To test the speed I was running each program from the command line! ^_^

                      A train station is where the train stops. A bus station is where the bus stops. On my desk, I have a work station.... _________________________________________________________ My programs never have bugs, they just develop random features.

                      D Offline
                      D Offline
                      Daniel Grunwald
                      wrote on last edited by
                      #45

                      Yes but where did you get the disassembled C# code from? It looks like all locals are on the stack (never in registers), which the JIT normally does only when a debugger is attached.

                      S 1 Reply Last reply
                      0
                      • L Lost User

                        Are you sure you got the optimized version of the C# code? I mean, yea it's supposed to be lame, but it's worse than I expected

                        S Offline
                        S Offline
                        Super Lloyd
                        wrote on last edited by
                        #46

                        Yes it! :( Is it that bad? I'm not that conversant in ASM, so I couldn't tell... But in a way that's good news, they have room for improvement! Now, what are they waiting for!?! :rolleyes:

                        A train station is where the train stops. A bus station is where the bus stops. On my desk, I have a work station.... _________________________________________________________ My programs never have bugs, they just develop random features.

                        1 Reply Last reply
                        0
                        • D Daniel Grunwald

                          Yes but where did you get the disassembled C# code from? It looks like all locals are on the stack (never in registers), which the JIT normally does only when a debugger is attached.

                          S Offline
                          S Offline
                          Super Lloyd
                          wrote on last edited by
                          #47

                          Ha, the disassembly I got it from VS! Not sure how to get it otherwise... Because on the disk it's not compiled, it's just MSIL, and even if I NGen I dunno where they store the compiled version! (BTW I just tried NGen and it was not faster!?!)

                          A train station is where the train stops. A bus station is where the bus stops. On my desk, I have a work station.... _________________________________________________________ My programs never have bugs, they just develop random features.

                          D 1 Reply Last reply
                          0
                          • M Mechanical

                            Aamir Butt wrote:

                            In some cases, C# can outperform C/C++

                            How about ALL cases ? People who talk about C# (or any other retards' language) performance are talking about void while engaged with other C# (or any other retards' language) performance addicts in group masturbation. The link in your post points to another post by a C# guru (read as: VB guru). It says: "Remember : Engineers are expensive and servers are not!". Look at that! I mean just look at how pathetic that retard is.

                            Aamir Butt wrote:

                            However, if you like to follow the sheep, go ahead.

                            I'll bet you are one of those that believe Java is the future of 3D.

                            NULL

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                            A Offline
                            Aamir Butt
                            wrote on last edited by
                            #48

                            Mechanical wrote:

                            I'll bet you are one of those that believe Java is the future of 3D.

                            Java... Hahahaha... well I can't stop laughing. I haven't worked in Java since school. And I bet you are the one who writes all his linked list, hashtable, search and sorting algorithm from scratch because he believes that he can do better than those retards.

                            Mechanical wrote:

                            How about ALL cases ?

                            Well, give me a case you are talking about but before that, give me the name of a NON-RETARD language as per your understanding.

                            1 Reply Last reply
                            0
                            • D DaveAuld

                              Nothing to do with the optimisation, but what about using the StopWatch class instead of datetime? Start the stop watch immediately before you enter the loop, and then stop it as soon as the loop exists.

                              Dave Find Me On: Web|Facebook|Twitter|LinkedIn CPRepWatcher now available as Packaged Chrome Extension, visit my articles for link.

                              S Offline
                              S Offline
                              Super Lloyd
                              wrote on last edited by
                              #49

                              well, I run 10000 thousand iteration to compare them, so DateTime seems precise enough! :) I did use StopWatch in the past but, I dunno, was never converted to it, I guess I never needed to make measurement precise enough!

                              A train station is where the train stops. A bus station is where the bus stops. On my desk, I have a work station.... _________________________________________________________ My programs never have bugs, they just develop random features.

                              1 Reply Last reply
                              0
                              • S Super Lloyd

                                Ha, the disassembly I got it from VS! Not sure how to get it otherwise... Because on the disk it's not compiled, it's just MSIL, and even if I NGen I dunno where they store the compiled version! (BTW I just tried NGen and it was not faster!?!)

                                A train station is where the train stops. A bus station is where the bus stops. On my desk, I have a work station.... _________________________________________________________ My programs never have bugs, they just develop random features.

                                D Offline
                                D Offline
                                Daniel Grunwald
                                wrote on last edited by
                                #50

                                Super Lloyd wrote:

                                Ha, the disassembly I got it from VS! Not sure how to get it otherwise...

                                To get the optimized JITted assembly code, you need to run your program from the command line, then attach the debugger to the running process, and click Break. Because your Main function was already running before you attached the debugger, it will still have the real native code. .NET doesn't re-jit anything when attaching a debugger.

                                S 1 Reply Last reply
                                0
                                • D Dan Neely

                                  Aamir Butt wrote:

                                  See here for a performance comparison between different languages[^]

                                  The comments on that post were staggeringly stupid. :((

                                  3x12=36 2x12=24 1x12=12 0x12=18

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                                  Aamir Butt
                                  wrote on last edited by
                                  #51

                                  Dan Neely wrote:

                                  The comments on that post were staggeringly stupid.

                                  Yes, unfortunately. There are other performance comparisons as well but there is no point in posting the links here. As i said earlier, following the sheep..... :)

                                  1 Reply Last reply
                                  0
                                  • S Simon P Stevens

                                    Well I've written a C# version that runs 15-20% faster that your original on my PC. It doesn't use unsafe either. But I don't think you'll like it.

                                    private static void SafeTest_Improved1(string[] args)
                                    {
                                    int NUM = int.Parse(args[0]);
                                    int end = 8193;
                                    var primes = new byte[8193]{
                                    1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
                                    1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
                                    1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
                                    1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
                                    1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
                                    1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
                                    1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
                                    1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
                                    1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
                                    1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
                                    1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
                                    1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
                                    1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
                                    1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
                                    1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
                                    1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
                                    1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
                                    1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
                                    1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
                                    1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,

                                        1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1
                                    
                                    S Offline
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                                    Super Lloyd
                                    wrote on last edited by
                                    #52

                                    :laugh: you could have moved the "for(...) prims[i] = 1" statement out of the loop for the same (and more condensed) result! But this is an unfair comparison with C++, you removed a whole set a "required" operation for the algorithm! Although... I wonder if an array copy from an initialized array would speed up things....

                                    A train station is where the train stops. A bus station is where the bus stops. On my desk, I have a work station.... _________________________________________________________ My programs never have bugs, they just develop random features.

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                                    • D Derek Viljoen

                                      Mechanical, I checked your profile. You've never authored an article, posted a snippet, entered a blog post, or otherwise shared any original thought, except to snipe at other people's comments on the message boards. In other words, you have yet to provide any empirical evidence for your worth to this site. No be a good boy and go away, please.

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                                      Mechanical
                                      wrote on last edited by
                                      #53

                                      Derek Viljoen wrote:

                                      In other words, you have yet to provide any empirical evidence for your worth to this site. No be a good boy and go away, please.

                                      You have much to learn, little one.

                                      NULL

                                      R 1 Reply Last reply
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                                      • L Lost User

                                        Post it?

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                                        Super Lloyd
                                        wrote on last edited by
                                        #54

                                        okay, I ran it from the command line and attached a debugger, here is the release version, run and optimized at its best I guess. what do you think? (well, if you can read that! :~ ) (no inline C# comment this time!) ===============================================

                                        00000000 push ebp
                                        00000001 mov ebp,esp
                                        00000003 push edi
                                        00000004 push esi
                                        00000005 push ebx
                                        00000006 sub esp,48h
                                        00000009 mov esi,ecx
                                        0000000b lea edi,[ebp-54h]
                                        0000000e mov ecx,12h
                                        00000013 xor eax,eax
                                        00000015 rep stos dword ptr es:[edi]
                                        00000017 mov ecx,esi
                                        00000019 mov dword ptr [ebp-10h],esp
                                        0000001c mov dword ptr [ebp-54h],496CC9B0h
                                        00000023 cmp dword ptr [ecx+4],1
                                        00000027 je 00000043
                                        00000029 call 620CD310
                                        0000002e mov ecx,eax
                                        00000030 mov edx,dword ptr ds:[03522030h]
                                        00000036 mov eax,dword ptr [ecx]
                                        00000038 call dword ptr [eax+000000D8h]
                                        0000003e jmp 0000017B
                                        00000043 cmp dword ptr [ecx+4],0
                                        00000047 jbe 00000191
                                        0000004d mov esi,dword ptr [ecx+0Ch]
                                        00000050 call 620C0CC0
                                        00000055 push eax
                                        00000056 mov ecx,esi
                                        00000058 mov edx,7
                                        0000005d call 620CF2F0
                                        00000062 mov ebx,eax
                                        00000064 lea edi,[ebp-30h]
                                        00000067 xor eax,eax
                                        00000069 stos dword ptr es:[edi]
                                        0000006a stos dword ptr es:[edi]
                                        0000006b lea ecx,[ebp-30h]
                                        0000006e call 62069650
                                        00000073 call 62069730
                                        00000078 mov ecx,eax
                                        0000007a lea eax,[ebp-30h]
                                        0000007d push dword ptr [eax+4]
                                        00000080 push dword ptr [eax]
                                        00000082 lea edx,[ebp-18h]
                                        00000085 mov eax,dword ptr [ecx]
                                        00000087 call dword ptr [eax+48h]
                                        0000008a mov ecx,801h
                                        0000008f push 0
                                        00000091 dec ecx
                                        00000092 jne 0000008F
                                        00000094 mov ecx,esp
                                        00000096 mov dword ptr [ebp-10h],esp
                                        00000099 mov esi,ecx
                                        0000009b jmp 000000DA
                                        0000009d xor edx,edx
                                        0000009f mov byte ptr [esi+edx],1
                                        000000a3 inc edx
                                        000000a4 cmp edx,2001h
                                        000000aa jl 0000009F
                                        000000ac mov ecx,2
                                        000000b1 cmp byte ptr [esi+ecx],0
                                        000000b5 je 000000D1
                                        000000b7 mov edx,ecx
                                        000000b9 add edx,edx
                                        0000

                                        L D 2 Replies Last reply
                                        0
                                        • D Daniel Grunwald

                                          Super Lloyd wrote:

                                          Ha, the disassembly I got it from VS! Not sure how to get it otherwise...

                                          To get the optimized JITted assembly code, you need to run your program from the command line, then attach the debugger to the running process, and click Break. Because your Main function was already running before you attached the debugger, it will still have the real native code. .NET doesn't re-jit anything when attaching a debugger.

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                                          Super Lloyd
                                          wrote on last edited by
                                          #55

                                          Thanks, done! Posted there: http://www.codeproject.com/Lounge.aspx?msg=3657593#xx3657593xx[^] However, I'm not conversant in ASM, so I can't tell much from it...

                                          A train station is where the train stops. A bus station is where the bus stops. On my desk, I have a work station.... _________________________________________________________ My programs never have bugs, they just develop random features.

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