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2014/10/15 ¤U¤È 10:05:44
iphone Programming Glossary: cpuhttp://stackoverflow.com/questions/230984/compression-api-on-the-iphone compile under OS X. bzip2 is a better choice for smallest file sizes but requires much more CPU power to compress and decompress. Also since you're talking to a web service you may not have to do..
Starting iPhone app development in Linux? http://stackoverflow.com/questions/276907/starting-iphone-app-development-in-linux provide a differing response I'm running OS X and Xcode on a virtualised VMware machine on Linux. CPU is a Core2Quad Q8800 and it is perfectly fast. I found a prebuilt VM online I'll leave it to you to..
Fast and Lean PDF Viewer for iPhone / iPad / iOs - tips and hints? http://stackoverflow.com/questions/3889634/fast-and-lean-pdf-viewer-for-iphone-ipad-ios-tips-and-hints up. UIImage Method PDF's in a UIImage don't optically scale as well as a Layer approach. The CPU and memory hit on generating the UIImages from a PDFcontext limits prevents using it to create a real..
iPhone - Backgrounding to poll for events http://stackoverflow.com/questions/4656214/iphone-backgrounding-to-poll-for-events to Apple you have some time 5 seconds left to finish tasks. I discovered that this must be CPU time. So that means if you do nothing your app is still being executed Apple suggest to call an expirationhandler.. our process app endBackgroundTask bgTask bgTask UIBackgroundTaskInvalid Be very spare with CPU Time here and your app runs longer But one thing is for sure your app will be terminated after a while... process With this PingPong I can do a lot of backgrounding. but remember be very spare with CPU time. And save all data to restore your views your app will be terminated some time later. To make it..
http://stackoverflow.com/questions/706344/lock-unlock-events-iphone stays awake while backgrounded there are no ways to determine that the screen is locked CPU speed doesn't report BUS speed remains the same mach_time denom numer doesn't change ... However 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 access to a small rectangular rendering area in the frame buffer to process the data further in CPU. Performance is important because I have to perform this operation repeatedly. I have searched the web..
http://stackoverflow.com/questions/230984/compression-api-on-the-iphone And you can always add others as long as they'll generally compile under OS X. bzip2 is a better choice for smallest file sizes but requires much more CPU power to compress and decompress. Also since you're talking to a web service you may not have to do much. NSURLRequest accepts gzip encoding transparently in server..
Starting iPhone app development in Linux? http://stackoverflow.com/questions/276907/starting-iphone-app-development-in-linux tools iphone ios linux share improve this question To provide a differing response I'm running OS X and Xcode on a virtualised VMware machine on Linux. CPU is a Core2Quad Q8800 and it is perfectly fast. I found a prebuilt VM online I'll leave it to you to find Xcode iPhone development works perfectly as does debugging..
Fast and Lean PDF Viewer for iPhone / iPad / iOs - tips and hints? http://stackoverflow.com/questions/3889634/fast-and-lean-pdf-viewer-for-iphone-ipad-ios-tips-and-hints PDF in a Zoomable UIScrollview But the same issues keep cropping up. UIImage Method PDF's in a UIImage don't optically scale as well as a Layer approach. The CPU and memory hit on generating the UIImages from a PDFcontext limits prevents using it to create a real time render of new zoom levels. CATiledLayer Method Theres..
iPhone - Backgrounding to poll for events http://stackoverflow.com/questions/4656214/iphone-backgrounding-to-poll-for-events termination. Now write some Task has to be finished code. According to Apple you have some time 5 seconds left to finish tasks. I discovered that this must be CPU time. So that means if you do nothing your app is still being executed Apple suggest to call an expirationhandler if you are finished with your work. In the code.. the expirationHandler so your App runs until the system terminates our process app endBackgroundTask bgTask bgTask UIBackgroundTaskInvalid Be very spare with CPU Time here and your app runs longer But one thing is for sure your app will be terminated after a while. But because you registered your app as VoIP or one of the.. restarts the app in background which will restart your background process With this PingPong I can do a lot of backgrounding. but remember be very spare with CPU time. And save all data to restore your views your app will be terminated some time later. To make it appear still running you must jump back into your last state..
http://stackoverflow.com/questions/706344/lock-unlock-events-iphone sorts of scenarios... and from all my testing even if your application stays awake while backgrounded there are no ways to determine that the screen is locked CPU speed doesn't report BUS speed remains the same mach_time denom numer doesn't change ... However it seems Apple does turn off the accelerometer when the device..
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 frame buffer than using glReadPixels I would need read only access to a small rectangular rendering area in the frame buffer to process the data further in CPU. Performance is important because I have to perform this operation repeatedly. I have searched the web and found some approach like using Pixel Buffer Object and..
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 require additional draw calls but I suspect the improvement in vertex throughput will outweigh the extra per draw call CPU overhead. Note that it ™s generally beneficial on MBX and elsewhere to ensure that each vertex attribute begins on a 32 bit..
How do I create/render a UIImage from a 3D transformed UIImageView? http://stackoverflow.com/questions/1949003/how-do-i-create-render-a-uiimage-from-a-3d-transformed-uiimageview cocoa touch core animation share improve this question I ended up creating a render method pixel per pixel on the CPU using the inverse of the view transform. Basically it renders the original UIImageView into a UIImage. Then every pixel..
http://stackoverflow.com/questions/230984/compression-api-on-the-iphone long as they'll generally compile under OS X. bzip2 is a better choice for smallest file sizes but requires much more CPU power to compress and decompress. Also since you're talking to a web service you may not have to do much. NSURLRequest accepts..
Starting iPhone app development in Linux? http://stackoverflow.com/questions/276907/starting-iphone-app-development-in-linux this question To provide a differing response I'm running OS X and Xcode on a virtualised VMware machine on Linux. CPU is a Core2Quad Q8800 and it is perfectly fast. I found a prebuilt VM online I'll leave it to you to find Xcode iPhone development..
Fast and Lean PDF Viewer for iPhone / iPad / iOs - tips and hints? http://stackoverflow.com/questions/3889634/fast-and-lean-pdf-viewer-for-iphone-ipad-ios-tips-and-hints same issues keep cropping up. UIImage Method PDF's in a UIImage don't optically scale as well as a Layer approach. The CPU and memory hit on generating the UIImages from a PDFcontext limits prevents using it to create a real time render of new..
When to use PNG or JPG in iPhone development? http://stackoverflow.com/questions/3929281/when-to-use-png-or-jpg-in-iphone-development iphone ios png jpeg share improve this question PNG's are pixel perfect non lossy and require very little extra CPU energy to display. However large PNGs may take longer to read from storage than more compressed image formats and thus be..
What happens to an iPhone app when iPhone goes into stand-by mode? http://stackoverflow.com/questions/411436/what-happens-to-an-iphone-app-when-iphone-goes-into-stand-by-mode according to Oliver Drobnik the device sleeps. This is like closing the lid on your laptop all activity on the main CPU halts. This does not happen if the device is playing audio in the right audio session. See DTS Q A QA1626 Audio Session..
iPhone - Backgrounding to poll for events http://stackoverflow.com/questions/4656214/iphone-backgrounding-to-poll-for-events be finished code. According to Apple you have some time 5 seconds left to finish tasks. I discovered that this must be CPU time. So that means if you do nothing your app is still being executed Apple suggest to call an expirationhandler if you.. the system terminates our process app endBackgroundTask bgTask bgTask UIBackgroundTaskInvalid Be very spare with CPU Time here and your app runs longer But one thing is for sure your app will be terminated after a while. But because you.. restart your background process With this PingPong I can do a lot of backgrounding. but remember be very spare with CPU time. And save all data to restore your views your app will be terminated some time later. To make it appear still running..
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 I created a benchmark application as part of the testing for my GPUImage framework and profiled the performance of raw CPU based filters Core Image filters and GPUImage filters with live video feeds. The following were the times in milliseconds.. iPhone's camera for two different hardware models running two different OS versions iPhone 4 iOS 5 iPhone 4S iOS 6 CPU 458 ms 2.2 FPS 183 ms 5.5 FPS Core Image 106 ms 6.7 FPS 8.2 ms 122 FPS GPUImage 2.5 ms 400 FPS 1.8 ms 555 FPS For Core Image..
Is programmatically inverting the colors of an image possible? http://stackoverflow.com/questions/6672517/is-programmatically-inverting-the-colors-of-an-image-possible on quixoto's answer and because I have relevant source code from a project of my own if you were to need to drop to on CPU pixel manipulation then the following which I've added exposition to should do the trick @implementation UIImage NegativeImage..
http://stackoverflow.com/questions/706344/lock-unlock-events-iphone even if your application stays awake while backgrounded there are no ways to determine that the screen is locked CPU speed doesn't report BUS speed remains the same mach_time denom numer doesn't change ... However it seems Apple does turn..
What is the iOS 5.0 user agent string? http://stackoverflow.com/questions/7825873/what-is-the-ios-5-0-user-agent-string is the iPhone 4 user agent iphone ios ipad ios5 user agent share improve this question iPhone Mozilla 5.0 iPhone CPU iPhone OS 5_0 like Mac OS X AppleWebKit 534.46 KHTML like Gecko Version 5.1 Mobile 9A334 Safari 7534.48.3 iPad Mozilla 5.0.. 5_0 like Mac OS X AppleWebKit 534.46 KHTML like Gecko Version 5.1 Mobile 9A334 Safari 7534.48.3 iPad Mozilla 5.0 iPad CPU OS 5_0 like Mac OS X AppleWebKit 534.46 KHTML like Gecko Version 5.1 Mobile 9A334 Safari 7534.48.3 share improve this..
iOS - Get CPU usage from application http://stackoverflow.com/questions/8223348/ios-get-cpu-usage-from-application Get CPU usage from application Does anyone know how to do it It's definitely possible because there are application in app store..
Better performance with libxml2 or NSXMLParser on the iPhone? http://stackoverflow.com/questions/826281/better-performance-with-libxml2-or-nsxmlparser-on-the-iphone I'm curious what your solution is for high performance XML parsing on the iPhone is given its limited amount of CPU power. I have reviewed the XML Performance App that Apple provides as a demonstration and it seems that for the data feed..
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 I would need read only access to a small rectangular rendering area in the frame buffer to process the data further in CPU. Performance is important because I have to perform this operation repeatedly. I have searched the web and found some approach..
Internal clock in iPhone background mode http://stackoverflow.com/questions/9564823/internal-clock-in-iphone-background-mode say my original answer isn't correct. When the device goes to sleep can happen sometime after it's locked the internal CPU clock stops ticking and mach_absolute_time won't update either. Theoretically it will return the exact same value if you..
How to find available memory in iPhone programmatically? http://stackoverflow.com/questions/1020327/how-to-find-available-memory-in-iphone-programmatically host_info points to is filled with a struct host_basic_info what looks like that struct host_basic_info integer_t max_cpus max number of CPUs possible integer_t avail_cpus number of CPUs now available natural_t memory_size size of memory in.. what looks like that struct host_basic_info integer_t max_cpus max number of CPUs possible integer_t avail_cpus number of CPUs now available natural_t memory_size size of memory in bytes capped at 2 GB cpu_type_t cpu_type cpu type.. integer_t avail_cpus number of CPUs now available natural_t memory_size size of memory in bytes capped at 2 GB cpu_type_t cpu_type cpu type cpu_subtype_t cpu_subtype cpu subtype cpu_threadtype_t cpu_threadtype cpu threadtype integer_t..
iPod Touch compared to iPhone as development platform for iPhone apps http://stackoverflow.com/questions/1128245/ipod-touch-compared-to-iphone-as-development-platform-for-iphone-apps
Zbar SDK and ios7/xcode 5 - App is reaching 100% cpu use and memory more than 100MB http://stackoverflow.com/questions/19019607/zbar-sdk-and-ios7-xcode-5-app-is-reaching-100-cpu-use-and-memory-more-than-10 SDK and ios7 xcode 5 App is reaching 100 cpu use and memory more than 100MB We are using Zbar bar code reader from last 2 years. With iOS 7 and Xcode 5 after scanning.. Zbar bar code reader from last 2 years. With iOS 7 and Xcode 5 after scanning 5 bar codes the app is reaching 100 cpu use for iOS 7 device I can see that in Xcode debug mode and app become less responsive. We never had issue in earlier iOS..
fastest way to draw a screen buffer on the iphone http://stackoverflow.com/questions/2395650/fastest-way-to-draw-a-screen-buffer-on-the-iphone and the rendering of the now non updating texture resulted in 60fps 30 renderer usage and no notable spikes from the cpu. note that GetBuffer simply returns a pointer to the software backbuffer of the GUI system there is no re gigging or resizing..
Submitting iPhone app to app store without testing on a device http://stackoverflow.com/questions/3136087/submitting-iphone-app-to-app-store-without-testing-on-a-device
http://stackoverflow.com/questions/4745618/ogg-vorbis-in-iphone-sdk you convert them to aac you will be able to play them back using hardware decoding which is much more efficient from a cpu usage point of view. They mentioned PASoundMgr. It worked for me. I just copied from cocos2d framework all files libraries..
iPhone SDK 4.3 libav compiling problem http://stackoverflow.com/questions/5516170/iphone-sdk-4-3-libav-compiling-problem usr bin arm apple darwin10 gcc 4.2.1' sysroot Developer Platforms iPhoneOS.platform Developer SDKs iPhoneOS4.3.sdk cpu arm1176jzf s extra cflags ' arch armv6' extra ldflags ' arch armv6' make clean make as a result I get library files but.. L Developer Platforms iPhoneOS.platform Developer SDKs iPhoneOS6.0.sdk usr lib system target os darwin arch arm cpu cortex a8 extra cflags ' arch armv7' extra ldflags ' arch armv7' extra cflags ' mfpu neon mfloat abi softfp mvectorize with.. L Developer Platforms iPhoneOS.platform Developer SDKs iPhoneOS6.0.sdk usr lib system target os darwin arch arm cpu cortex a8 extra cflags ' arch armv7s' extra ldflags ' arch armv7s' extra cflags ' mfpu neon mfloat abi softfp mvectorize..
problem compiling ffmpeg for iFrameExtractor http://stackoverflow.com/questions/6994151/problem-compiling-ffmpeg-for-iframeextractor these leave the following errors lipo specifed architecture type armv6 for file armv6 libavcodec.a does not match it's cputype 16777223 and cpusubtype 3 should be cputype 12 and cpusubtype 6 lipo specifed architecture type armv6 for file armv6.. errors lipo specifed architecture type armv6 for file armv6 libavcodec.a does not match it's cputype 16777223 and cpusubtype 3 should be cputype 12 and cpusubtype 6 lipo specifed architecture type armv6 for file armv6 libavdevice.a does not.. architecture type armv6 for file armv6 libavcodec.a does not match it's cputype 16777223 and cpusubtype 3 should be cputype 12 and cpusubtype 6 lipo specifed architecture type armv6 for file armv6 libavdevice.a does not match it's cputype 16777223..
iOS - Get CPU usage from application http://stackoverflow.com/questions/8223348/ios-get-cpu-usage-from-application because there are application in app store Activity Monitor Touch which can show it. iphone objective c ios xcode cpu usage share improve this question Update . This code is working for me Update 2 . The thread_list was leaking so added.. . This code is working for me Update 2 . The thread_list was leaking so added vm_deallocate #import mach mach.h float cpu_usage kern_return_t kr task_info_data_t tinfo mach_msg_type_number_t task_info_count task_info_count TASK_INFO_MAX kr task_info.. if kr KERN_SUCCESS return 1 if thread_count 0 stat_thread thread_count long tot_sec 0 long tot_usec 0 float tot_cpu 0 int j for j 0 j thread_count j thread_info_count THREAD_INFO_MAX kr thread_info thread_list j THREAD_BASIC_INFO thread_info_t..
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