2014/10/15 下午 10:04:34

iphone Programming Glossary: benchmark

What does the Tiler Utilization statistic mean in the iPhone OpenGL ES instrument?

http://stackoverflow.com/questions/1287811/what-does-the-tiler-utilization-statistic-mean-in-the-iphone-opengl-es-instrumen

I can't seem to push my application above 320 000 triangles s on an iPhone 3G running the 3.0 OS. According to this benchmark I should be able to hit 687 000 triangles s on this hardware with the smooth shading I'm using. In my testing when I run.. against the running device I'm seeing the statistic Tiler Utilization reaching nearly 100 when rendering my benchmark yet the Renderer Utilization is only getting to about 30 . This may be providing a clue as to what the bottleneck is in.. application is available if you want to download and test it yourself. In the current configuration it starts a little benchmark every time you load a new molecular structure and outputs the triangles s to the console. iphone opengl es instruments..

Determining the magnitude of a certain frequency on the iPhone

http://stackoverflow.com/questions/2921674/determining-the-magnitude-of-a-certain-frequency-on-the-iphone

even though you may be theoretically doing less work it may take longer than the FFT. You would probably just have to benchmark this to see which approach is better. I've left out quite a few other details for simplicity's sake that shouldn't matter..

iPhone GCC / LLVM GCC or LLVM?

http://stackoverflow.com/questions/3739783/iphone-gcc-llvm-gcc-or-llvm

as the sessions on LLVM from WWDC 2009 if you have them. I saw a 20 speedup going from GCC to LLVM 1.5 in an informal benchmark within one of my applications but it wasn't a rigorous test so consider that only anecdotal evidence. My recommendation..

Measuring the UITableView Scrolling Performance - iphone

http://stackoverflow.com/questions/5459708/measuring-the-uitableview-scrolling-performance-iphone

to the same point when we have lots of subviews we should go with drawRect. The problem is that I do not know how to benchmark the performance in either case using subview or drawing. And drawing is actually harder to do than subview so it is hard.. to convince everybody to go with drawing directly. I am trying to write 2 small samples and using 2 techniques and benchmark the performance result. I am currently trying with this but it generates the same results for both techniques NSDate date..

Are the Core Image filters in iOS 5.0 fast enough for realtime video processing?

http://stackoverflow.com/questions/6625888/are-the-core-image-filters-in-ios-5-0-fast-enough-for-realtime-video-processing

Now that Core Image has been out on iOS for a while we can talk about some hard performance numbers. I created a benchmark application as part of the testing for my GPUImage framework and profiled the performance of raw CPU based filters Core.. as of iOS 6 it processes video more than fast enough to do live filtering on iPhone 4S and above. The source for these benchmarks can be found in my GitHub repository if you wish to see where I got these numbers from. I've updated this answer from my.. tone filter I was using as a basis of comparison was not performing the same operation as my own so it was a poor benchmark. The performance of Core Image filters also improved significantly in iOS 6 which helped make them more than fast enough..