real-time

问题 Say on a non-RT Linux kernel (4.14, Angstrom distro, running on iMX6) I have a program that receives UDP packets (< 1400 bytes) that come in at a very steady data rate. Basically, the essence of the program is: while (true) { recv( sockFd, ... ); update_loop_interval_histogram(); // O(1) } To minimize the maximally occuring delay time (loop intervals), I started my process with: chrt --fifo 99 ./programName setting the scheduler to a "real-time" mode SCHED_FIFO with highest priority. the CPU

问题 When I run a shell command in Python it does not show the output until the command is finished. the script that I run takes a few hours to finish and I'd like to see the progress while it is running. How can I have python run it and show the outputs in real-time? 回答1: Use the following function to run your code. In this example, I want to run an R script with two arguments. You can replace cmd with any other shell command. from subprocess import Popen, PIPE def run(command): process = Popen

问题 When I run a shell command in Python it does not show the output until the command is finished. the script that I run takes a few hours to finish and I'd like to see the progress while it is running. How can I have python run it and show the outputs in real-time? 回答1: Use the following function to run your code. In this example, I want to run an R script with two arguments. You can replace cmd with any other shell command. from subprocess import Popen, PIPE def run(command): process = Popen

问题 Problem : I’m currently making a python app that simulates a set of coupled ordinary differentials equations that depends on a variable, let’s call it « X ». As for now, I’m basically simulating this set of ODE with RK4 for given time then I’m plotting the graph on an animated plot with « matplotlib animation » embedded in tkinter. The fact is that I would like to be able to modify « X » as the equations are resolved so that the simulation can change as we modify this variable. Context : The

问题 I would like to create a websocket which will continuosly stream output from the program to the HTML webpage. Process that my program executes takes 2 minutes to complete and it logs the outputs while it executes. Right now, my code updates the webpage everytime the program finishes executing and then displays all the logs on the webpage at once. I would like to continuosly update my webpage, i.e.: stream the output in realtime. My server code looks like this: import nest_asyncio nest_asyncio

问题 I have added a snippet of javascript to my pdf download links in order to track downloads. When I watch RealTime Events from the GA dashboard, I don't see any activity when I click on a download link. My links have the following code: <a class='non-html' href='pdf/XXXX_2017_meeting_program.pdf' onclick=”var that=this;_gaq.push([‘_trackEvent’,’Download’,’PDF’,this.href]);setTimeout(function(){location.href=that.href;},200);return false;”>2017: 18th Annual Symposium, Chicago, IL, USA</a> Is the

问题 I am working with time-critical applications where the microsecond counts. I am interested to a more convenient way to develop my applications using a non bare-metal approach (some kind of framework or base foundation common to all my projects). A considered real-time operating system such as RTX, Xenomai, Micrium or VXWorks are not really real-time under my terms (or under the terms of electronic engineers). So I prefer to talk about soft-real-time and hard-real-time applications. An hard

问题 This is my first message here. I'm working with a non-blocking UDP socket on a real-time OS (OnTime and VxWorks). I have read the documentation and some forums but I have some doubts about 'atomicity' of sendto() and recvfrom() functions: sendto() returns the number of bytes enqueued or error. Is it possible that it's less then the input buffer length? Maybe the output buffer has not enough free space and just few bytes are enqueued... recvfrom() returns the number of byte received or error.

问题 I want to find custom shape in OpenCV. Shape is previously defined. I want to detect if this shape is equal or not equal to the current shape using WebCam in real time. How can I do that? How to compare pre-defined custom shape and current shape? 回答1: As the commenters have eluded, you can use template matching to detect custom shapes. So What Is Template Matching? Template matching is a technique in digital image processing for finding small parts of an image which match a template image. It

问题 I want to find custom shape in OpenCV. Shape is previously defined. I want to detect if this shape is equal or not equal to the current shape using WebCam in real time. How can I do that? How to compare pre-defined custom shape and current shape? 回答1: As the commenters have eluded, you can use template matching to detect custom shapes. So What Is Template Matching? Template matching is a technique in digital image processing for finding small parts of an image which match a template image. It