The importance of measuring performance changes is a topic that has been covered by others smarter and more experienced than me, but I have a recent simple tale.
I’ve simplified the code quite a bit in order to demonstrate the issue. Suppose I have a wrapper around an image (it has many more attributes):
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You know how you can use the extra mouse buttons to move back and forward in Internet Explorer?
The same shortcuts work in Visual Studio. Suppose you right-click on a function call, and select Go To Definition. Once you’re done looking at the definition, hit the back button on your mouse: You’re taken right back to [...]
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This is part three of my series on fast searching and filtering of text using C#.
The previous article developed an indexing method using a hash table. This article develops a method using a trie structure. If you don’t know tries, I highly encourage to go read about them before continuing.
This filtering method is much more [...]
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This is part two of my series on fast searching/filtering of text using C#.
In the previous article, we developed the filtering interface, built up a testing framework and implemented a naive indexer. For many purposes, that indexer performs more than adequately. Still, there are other possible implementations that might work better (or not…let’s wait and [...]
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I just had a nice reality check. Sort of pleasant in that I realized I could save a LOT of memory usage (like from 35MB down to 9 MB), but also aggravating because I have spent probably 10-20 hours developing a clever algorithm designed for speed.
Lesson learned. I should have built the naive version first. [...]
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I had a situation the other day where I needed an array of two values and the thought occurred to me: which is better? A 2-D array or a 1-D array of structs. I decided to come up with a quick test to see.
Here are my results:
2-D Arrays : 55.9376 cycles/row
Structs [...]
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I read Rico Mariani’s latest quiz, and decided to check out the results for myself in BRayTracer.
I already have some simple performance benchmark tests in my NUnit tests, so I ran some before and after. I changed only the ArrayList’s used in the scene object to hold shapes, materials, and lights.
Before:
25.197 opaque spheres/sec (time: 3.969 [...]
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time_t vs. GetTickCount vs QueryPerformanceTimer vs. GetMachineCycleCount
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