scheduling

问题 I'm reading about scheduling, but I can't figure out how a scheduler regains control after it invokes code in the user space. E.g. the scheduler passes the control to some app in the user space which does some infinite loop and no other hardware interrupt occurs on an one core chip. All documents talk about the scheduler regaining control and preemptivly interrupting the user process, but how does that work if the control is never passed back to the OS? Question: Does the scheduler register

问题 Downloaded OptaPlanner examples, testing them. In the Meeting Scheduling example provided, a single planning variable is returned in the solved solution. for example, for a meeting scheduling, one Room is returned. I am planning to allocate multiple rooms for a single meeting schedule if the locations are different (assuming VC enabled for remote rooms). Current Meeting Scheduling example does not show this. Do I need to change the planning variable room to a List? 回答1: Planning variables can

问题 I have to implement Scheduler like outlook in my .NET application.I have already started working on it but I can't implement Recurrence Pattern.please suggest me that how could i achieve this functionality. how to save task with Recurrence in database? I found this RadScheduler for ASP.NET AJAX but unfortunately this controller is commercial 回答1: A good place to start is Quartz.Net This is an open source library that does exactly what you want, sans any UI component. 来源： https://stackoverflow

问题 Here is the scenario: When my web app starts, I want to load data from several tables in local storage (using indexedDB). I delegate this work to a web worker. It will load each table in turn, and fire a message with the data as it loads each one. On the main thread, a listener will receive the message and store the data in a cache. But let's say the user presses a button to view the data for a specific table. The app calls a function that checks the cache, and sees that the data for that

问题 I am trying to automate a task with Heroku Scheduler. I tested the task in local and it works. I created a temporary route for testing, and it works everytime I hit the route: get 'create_expired_credit_lines' to: 'credits#create_expired_lines' credits.controller.rb class CreditsController < ApplicationController ... def self.create_expired_lines ... @new_credit = Credit.new(params[:credit]) ... end I then created a file app/lib/tasks/scheduler.rake desc "This task is called by the Heroku

问题 I am trying to use the code: import random import datetime from sched import scheduler from time import time, sleep s = scheduler(time, sleep) random.seed() def run_periodically(start, end, interval, func): event_time = start while event_time < end: s.enterabs(event_time, 0, func, ()) event_time += interval + random.random(-5, 45) s.run() getData()####### run_periodically(time()+5, time()+1000000, 10, getData) I am trying to get the scheduled time and or the scheduled interval to have some

问题 If I have a single core CPU on a TZ-enabled device and there are two processes running: one in the secure world and one in the non-secure world, is it possible to have the scheduler manage them in an pre-emptive way, such that each process gets assigned a certain time slice? 回答1: Actually, it is possible, but only in a round about way. You can't use a single scheduler to handle the two separate tasks as they execute in completely separate execution environments. What you can do though is use

问题 UPDATE2: I think I got it now: <?php /* * @name Lawler's algorithm PHP implementation * @desc This algorithm calculates an optimal schedule of jobs to be * processed on a single machine (in reversed order) while taking * into consideration any precedence constraints. * @author Richard Knop * */ $jobs = array(1 => array('processingTime' => 2, 'dueDate' => 3), 2 => array('processingTime' => 3, 'dueDate' => 15), 3 => array('processingTime' => 4, 'dueDate' => 9), 4 => array('processingTime' => 3,

问题 Problem : Five batch jobs A through E, arrive at a computer center at almost the same time. They have estimated running times 10, 6, 2, 4, and 8 minutes. Their (externally determined) priorities are 3, 5, 2, 1, and 4, respectively, with 5 being the highest priority. Determine the mean process turn around time. Ignore process switching overhead. For Round Robin Scheduling, assume that the system is multiprogramming, and that each job gets it fair share of the CPU.All jobs are completely CPU

问题 I have a app and i am currently using delayed_job. I was wondering if there are any recommended gems that do scheduling of repetitive tasks. I want to schedule task that happen on a certain frequency to clean the database/sending emails/run other methods. I mite want to run some tasks every day or every hour. Is there any good ones out there that are fairly easy to setup and config which do not use CRON. 回答1: You can convert that repetitive work to rakes and call those rakes via cron. For