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2014/10/15 ¤U¤È 10:04:41

iphone Programming Glossary: bottleneck

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

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 the display process but I don't know what these values mean and I've not found any documentation on them. Does someone..

to drawRect or not to drawRect (when should one use drawRect/Core Graphics vs subviews/images and why?)

http://stackoverflow.com/questions/14659563/to-drawrect-or-not-to-drawrect-when-should-one-use-drawrect-core-graphics-vs-su

with a single view rather than a complex hierarchy UIKit's drawRect optimizations become less important. So the bottleneck becomes how much you can optimize your Core Graphics drawing. Whenever you can use UIKit. Do the simplest implementation..

optimizing iPhone OpenGL ES fill rate

http://stackoverflow.com/questions/2785640/optimizing-iphone-opengl-es-fill-rate

the fill rate of the iPhone 3G but I'm not sure. My questions are How can I determine with more granularity where the bottleneck is That is my biggest problem I just don't know what is taking all the time. If it is fillrate is there anything I do to.. share improve this question Given that the Renderer Utilization is basically at 100 that indicates that the bottleneck is filling texturing and blending pixels. Techniques intended to optimize vertex processing VBOs and vertex formats or CPU..

Practical rules for premature optimization [closed]

http://stackoverflow.com/questions/2978460/practical-rules-for-premature-optimization

example of premature optimization is optimizing the code before you have profiled it to find out where the performance bottleneck is. An even more extreme example of premature optimization is optimizing before you have run your program and established..

Usage of NSException in iPhone Apps

http://stackoverflow.com/questions/4310560/usage-of-nsexception-in-iphone-apps

in iPhone Apps One of my friends asked me not to use NSException in iPhone Apps. The reason he gave was performance bottleneck . But I am not convinced of it. Can someone confirm me that we should restrain from using NSException in iPhone App If you..

How can I optimize the rendering of a large model in OpenGL ES 1.1?

http://stackoverflow.com/questions/5718846/how-can-i-optimize-the-rendering-of-a-large-model-in-opengl-es-1-1

suggestions iphone ios opengl es vbo share improve this question A Tiler Utilization of 100 indicates that your bottleneck is in the size of the geometry being sent to the GPU . Whatever you can do to shrink the geometry size can lead to an almost..

How can I improve the performance of my custom OpenGL ES 2.0 depth texture generation?

http://stackoverflow.com/questions/6051237/how-can-i-improve-the-performance-of-my-custom-opengl-es-2-0-depth-texture-gener

More about the process including diagrams can be found in my post here . The generation of this depth texture is a bottleneck in my rendering process and I'm looking for a way to make it faster. It seems slower than it should be but I can't figure.. way to do this. My depth fragment shader for spheres the most common display element looks to be at the heart of this bottleneck Renderer Utilization in Instruments is pegged at 99 indicating that I'm limited by fragment processing . It currently looks..

Assignment makes pointer from integer without a cast: address issue

http://stackoverflow.com/questions/6111533/assignment-makes-pointer-from-integer-without-a-cast-address-issue

is probably going to be unacceptably slow no matter how you do it. And I'll bet the drawing part is going to be your bottleneck so I doubt the difference between iterating through the subviews array or a 2D C array will make a noticeable difference..

Store an encryption key in Keychain while application installation process

http://stackoverflow.com/questions/886893/store-an-encryption-key-in-keychain-while-application-installation-process

without trouble. This will get rid of many of your problems right away. On which machine is the 100 1000x decrypt the bottleneck Is your server so busy that it can't do an asym decryption You should be doing this so infrequently on the phone that it..

Faster alternative to glReadPixels in iPhone OpenGL ES 2.0

http://stackoverflow.com/questions/9550297/faster-alternative-to-glreadpixels-in-iphone-opengl-es-2-0

. This is much much faster than using glReadPixels in my benchmarks. I found that on my iPhone 4 glReadPixels was the bottleneck in reading 720p video frames for encoding to disk. It limited the encoding from taking place at anything more than 8 9 FPS... than 8 9 FPS. Replacing this with the fast texture cache reads allows me to encode 720p video at 20 FPS now and the bottleneck has moved from the pixel reading to the OpenGL ES processing and actual movie encoding parts of the pipeline. On an iPhone..