performance comparision JAVA C#

Question

hi all! I have a question regarding performance of C#.I am working on a project in IMage processing.Right now i am using java.I have to use linked list which i have implemented or even the list provieded by java.This make the program exectutin very slow. Will i get better performance if i change the same code to C#? kindly help me.. parez81

ssswamii · Answer

I don't remember offhand how it works in Java, but in C# you must lock the bits of the bitmap into memory using the Bitmap.LockBits method. My guess is that you have to do something similar in Java. As far as storing the pixels, try to use an array. Using lists will cause a new memory allocation every pixel you add (not counting the initial allocation). If you can allocate a list large enough to store all the pixels of the bitmap, you'll be ok. Still, linked list have some overhead compared to arrays, basically due to the pointer to the next object needing to be stored for every element in the linked list. So try to use an array if possible. It doesn't matter that you have to store the pixel segments seperately; just get an initial allocation to hold all of them, then store segments of that initial allocation. For example, in C# it might look like: int numberOfPixels = bitmap.Width*bitmap.Height; Color[] colorArray = new Color[numberOfPixels]; bitmap.LockBits(...); // read in the pixels, store them in the color array... bitmap.Unlock();

paresh_s_007 · Answer

hi! yes i do use it to store pixlel.. i am woring on a segmentation program.. i have to store the diffrent segments separately. and i would not know the number of pixels that would go in one segment. In fact i have already imlemented the project in java and it takes a lot of time for exectution.. It can be bad programming ... I haad to restructure the program once again. so i thought i would try c#.. (no i am not familiar with C#). Are there good libraries in C++ that would help? parez81

kovan · Answer

i have to disagree with the comment 'java itself is not slow' every java app/applet, servlet, bean or anything else i have ever seen on 'normal machines' have been extremely slow, and the reason is the JVM. and yes poor coding makes it slower. if your doing image processing you shouldnt be using java or c#, u should be using c++ i have to say though, java with image processing on a Sun Blade Server is fast because jvm is built right into the kernel.

ssswamii · Answer

What are you using the linked list for - storing the pixels of the bitmap? (hopefully not). Java itself is not slow, however, as with any other language including C#, poor coding practices will slow performance.

jimteeuwen · Answer

that's impossible to answer without some tests. I'd suggest you simply try it.