multiplexing | 易学教程

Seven Segment Multiplexing on Basys2

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问题 this is my first post so I hope I'm doing this correctly. I'm trying to output a "4 3 2 1" on a four digit seven segment display on a BASYS2 board. I have checked to make sure that 0 enables the signal and that I have the ports mapped correctly. I believe the error is within my multiplexing logic since I am only able to display a single digit. I'm new to Verilog (am used to C) and would appreciate any suggestions. Thanks `timescale 1ns / 1ps module main (clock, AN0, AN1, AN2, AN3, CA, CB, CC,

Why is threading works on a single core CPU?

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问题 To better understand Threading in Java, I wrote the following code public class SimpleRunnableTest { public static void main(String[] args) throws InterruptedException { long start = System.currentTimeMillis(); Thread t1 = new Thread(new TT1()); t1.start(); Thread t2 = new Thread(new TT2()); t2.start(); t2.join(); t1.join(); long end = System.currentTimeMillis(); System.out.println("end-start="+(end-start)); } } class TT1 implements Runnable { public void run(){ try { Thread.sleep(5000); }

What is low latency access of data?

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问题 What do you mean by low latency access of data? I am actually confused about the definition of the term " LATENCY " . Can anyone please elaborate the term "Latency". 回答1: Latency - The time it takes to access data. Bandwidth - How much data you can get. The classic example: A wagon full of backup tapes is high latency, high bandwidth. There's a lot of information in those backup tapes, but it takes a long time for a wagon to get anywhere. Low latency networks are important for streaming

Service Multiplexing using Apache Thrift

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问题 Server code: TMultiplexedProcessor processor = new TMultiplexedProcessor(); processor.registerProcessor( "AddService", new AddService.Processor(new AddHandler())); processor.registerProcessor( "MultiplyService", new MultiplyService.Processor(new MultiplyHandler())); TServerTransport serverTransport = new TServerSocket(7911); TSimpleServer server = new TSimpleServer(new TSimpleServer.Args(serverTransport). processor(processor)); System.out.println("Starting server on port 7911 ..."); server

React Native Image requests over a single HTTP/2 connection

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问题 We have many React Native <Image> components rendering per screen and are witnessing performance issues due to many simultaneous http requests. Opening and closing a connection is expensive, and having too many simultaneous connections can hit limitations that cause timeouts. HTTP/2 features multiplexing, allowing multiple requests and response messages between the client and server to be in flight at the same time over a single connection, instead of multiple connections, which improves page

React Native Image requests over a single HTTP/2 connection

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Google Chrome does not do multiplexing with http2

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问题 I am building a webapp and serving it over http2. However when I analyze network in Google Chrome (Version 59.0.3071.115 (Official Build) (64-bit))'s developers tools, it is clear that multiplexing does not work as there are only 6 active connections (like with http1.1) and the rest of connections are queued. Why is this? Or are my expectations not correct? The screenshot (you can see that protocol is http2): Update #1: The backend runs on nginx 1.13; I am using custom modules loader which

Android Extract Decode Encode Mux Audio

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问题 I am trying to adapt the code found in ExtractDecodeEditEncodeMuxTest.java in order to extract audio and video from a mp4 recorded via Cordova's device.capture.captureVideo, decode the audio, edit the decoded audio samples, encode the audio, and mux the audio back with the video and save as an mp4 again. My first attempt is simply to extract, decode, encode and mux audio without trying to edit any of the audio samples - if I can do this I am fairly certain that I can edit the decoded samples

五大I/O模型详解

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【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 同步与异步&阻塞与非阻塞五大I/O模型详解 java I/O模型简述前文在同步与异步&阻塞与非阻塞中，简要的介绍一些基础概念，但这些概念最终是为IO所服务，是为文件所服务。按照Linux一句话来说，一切皆文件。一、Unix IO模型 Unxi大师Richard Stevens在 UNIX® Network Programming 中讲述了五种I/O 模型 blocking IO nonblocking IO IO multiplexing signal driven IO asynchronous IO 而本文也是基于这五种I/O模型，以及交叉着同步与异步&阻塞与非阻塞的概念。但在探讨I/O模型之前，先要了解一下I/O模型发生的对象和步骤。对于一个文件IO的操作(这里以read为例子)，会涉及到两个对象：一个是调用这个IO的进程process 另外一个就是系统内核kernel 当一个read操作发生时，会经历两个阶段进程等待内核数据准备(Waiting for the data to be ready) 将数据从内核拷贝到进程中 (Copying the data from the kernel to the process) 二、五大I/O模型 1.blocking IO(阻塞IO) 1.1

HTTP/2 streams vs HTTP/1.1 connections

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问题 If we disregard the overhead of new connection creation in HTTP/1.1, is there any cases where connections perform better than HTTP/2 streams? I conducted some performance tests for page load times and I noticed that HTTP/1.1(https) performs better than HTTP/2 for requests with large responses. Then when I start to increase the concurrency level, HTTP/2 starts to perform better. In other words, concurrency level which HTTP/2 starts to give better performance goes up with the size of the