low-latency | 易学教程

Simple low-latency audio playback in iOS Swift

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I'm a beginner in iOS and I'm trying to design a drum set app with Swift. I designed a view with a single button and wrote the code below, but it has some problems: Some sounds are lost when I touch the button quickly like a drum roll. Still in a 'drum roll', the sound is interrupted every time the button is touched, instead of letting the sample play till its ending. It's awful in cymbal roll, for instance. I'd like to hear every sample sounding completely, even if I touch the button again. There is a latency between the touch and the sound. I know that AVAudioPlayer is not the best choice

Differences between ZeroMQ and WebSockets

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I'd like to know what the differences are between the ZeroMQ and WebSockets protocols . I know WebSockets was designed for web browser clients, but I'm assuming it can also be used server to server. And, in that case, I'm wondering if it would be good to use WebSockets instead of something else like ZeroMQ for real-time messaging . Specifically, I'm worried about reliability and missing messages in case of temporary network failure. A: Real-Time-Messaging is a nice tag, however You may soon realise, that once going into the territory of Real-Time , there is no justification for spending clock

Set Windows command-line terminal title in Python

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I'm running several instances of a certain Python script on a Windows machine, each from a different directory and using a separate shell windows. Unfortunately Windows gives each of these shell windows the same name: <User>: C:\Windows\system32\cmd.exe - <script.py> Is it possible to set this name to something else through a Python command? This works for Python2.7 under Windows. >>> import ctypes >>> ctypes.windll.kernel32.SetConsoleTitleA("My New Title") On Windows, a simple console command will suffice: from os import system system("title "+myCoolTitle) Nice & easy. Due to not enough rep I

Why to use websocket and what is the advantage of using it? [closed]

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问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 2 years ago . I tried reading some articles, but not so clear on this topic. Would someone like to explain me below points: Why use websocket over http what is full duplex communication what do you mean by lower latency interaction Any form of help is appreciated. 回答1: Why use websocket over

Why does the JVM require warmup?

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问题 I understand that in the Java virtual machine (JVM), warmup is potentially required as Java loads classes using a lazy loading process and as such you want to ensure that the objects are initialized before you start the main transactions. I am a C++ developer and have not had to deal with similar requirements. However, the parts I am not able to understand are the following: Which parts of the code should you warm up? Even if I warm up some parts of the code, how long does it remain warm

Simple low-latency audio playback in iOS Swift

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问题 I'm a beginner in iOS and I'm trying to design a drum set app with Swift. I designed a view with a single button and wrote the code below, but it has some problems: Some sounds are lost when I touch the button quickly like a drum roll. Still in a 'drum roll', the sound is interrupted every time the button is touched, instead of letting the sample play till its ending. It's awful in cymbal roll, for instance. I'd like to hear every sample sounding completely, even if I touch the button again.

Approximate cost to access various caches and main memory?

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问题 Can anyone give me the approximate time (in nanoseconds) to access L1, L2 and L3 caches, as well as main memory on Intel i7 processors? While this isn\'t specifically a programming question, knowing these kinds of speed details is neccessary for some low-latency programming challenges. 回答1: Here is a Performance Analysis Guide for the i7 and Xeon range of processors. I should stress, this has what you need and more (for example, check page 22 for some timings & cycles for example).