Is CLR really 100 times slower than Win32

[Al6200]

I've run 2 rather similar codes, one using unmanaged DirectX in C++, and another doing roughly the same thing using managed DirectX in C#. The one in C++ runs quite smoothly, with no hiccups or slowdowns whatsoever, however the one written in managed DirectX was only able to update the screen every second or two.

Since the C# code was written by me, and the C++ code was pulled from the internets, one could attribute the performance difference to my poor coding skills, yet that one would be a n00b. :?):?):?):?)...

...Or Santa Clause

:shifty:

[Templarian]

Something tells me you may be doing something wrong (while managed has more overhead it shouldn't be significantly slower).

Paste your code for your version.

[Al6200]

Really? Not significantly slower?

I've been considering that in my mound of code (its over 1000 lines), I accidentally am writing to the hard-drive in my main while loop, which certainly would account for a huge slow-down.

I've fixed a few things which have made it faster, but its still at least 20-30 times slower than unmanaged I reckon. I don't really mind using unmanaged, its just that C++ code is ugly in my opinion, and organizing large projects is more difficult.

[TheColonial]

... I've fixed a few things which have made it faster, but its still at least 20-30 times slower than unmanaged I reckon....

You 'reckon? :D

My vote is that it's still your code :) Sorry if that sounds rude, but it's the truth. There have been many benchmarks run for C, C++, C# and Java, and there's a million and one comparisons of relative performance across the languages. From what I can see, none of them have shown a difference that great, which IMHO suggests that your design isn't optimal. If you have a read around the web and see the benchmarks you'll be surprised at how quick managed code is. Sure, it's always going to be slower than C++ in most cases, but it's a lot quicker than you think it is.

If you're sure it's not your code, then why not post it here and let us see for ourselves? :)

Cheers :nose:
OJ

[hybrid101]

could it be a memory leak?

[Templarian]

^Never used managed DX have your hybrid, you would have to try to make a memory leak for it to happen.

[TheColonial]

As a rule of thumb, make sure you use the using (http://msdn2.microsoft.com/en-us/library/yh598w02(VS.80).aspx) statement around all your Disposable objects (where you can!).

If you're still not sure what's going on, post the code!

OJ

[Al6200]

You mean like

n = new myClass();
using(n) {
n.something()
}

[TheColonial]

using( MyClass mc = new MyClass() )
{
n.Something();
}