scheduler

问题 Are there any good resources (books, websites) that give very good comparison of different scheduling algorithms for a Finite State Machine (FSM) in an embedded system without an OS? I am designing a simple embedded web server without an OS. I would like to know what are the various methods used to schedule the processing of the different events that occur in the system. For example,if two events arrived at the same time how are the events prioritized? If I assign different priorities to

问题 It is common to use crontab to schedule a task. However, I found that crontab can only schedule tasks on a minutely, hourly or daily basis. If I want to schedule task on every 4 hours, I can still make it by setting up 6 daily task. However, what if I want to have a period that doesn't make up one day, say, a task every 5 hours / 7 hours? Is there a way to set up the task by hour period in crontab or using other tools? (would be even better if that tool can be run on PaaS like Heroku /

问题 I'm looking into using apex scheduler to run a batch job. We can run it whenever we want, say 3 am when traffic is low, but I'm trying to anticipate some 'Oh-Crap' Scenarios. Can you guys help answer these questions for me? Setup: When the user modifies a territory 100k's of records can get updated. Questions: What are some scenarios that can realistically cause my jobs to not terminate? I thought of a scenario of- when a user is editing a contact which happens to be in one of the batches is

问题 I am doing project on the Embedded web server. The Embedded server is without the Operating system. At this conditions how the multiple task will be scheduled in such system? are the cyclic-executive and super-loop same things? 回答1: cyclic-executive with or without interrupts 来源： https://stackoverflow.com/questions/11904288/task-scheduling-in-embedded-web-server-with-out-os

问题 I have the following code. When the scheduler runs I am getting the error message. Some one help me to resolve the error in the code MissingError One of the documents you are trying to access has been deleted, please try again after refreshing. def send_followup_mail(self, cr, uid, context=None): quot_ids=self.search(cr, uid, [('state','=','amend_quote')]) for quot_id in quot_ids: if quot_id: quot_obj=self.browse(cr, uid, quot_id ,context=context) quotation_since=quot_obj.quotation_since for

问题 I'm having trouble understanding Heroku's scheduler documentation. They give this as example code, but I'm not sure what's what: desc "This task is called by the Heroku scheduler add-on" task :update_feed => :environment do puts "Updating feed..." NewsFeed.update puts "done." end task :send_reminders => :environment do User.send_reminders end I am hoping to use this scheduler to call method from my NotificationsController on a daily basis. I've tried modifying their code to: desc "This task

问题 I am trying to understand linux kernel code for task scheduler. I am not able to figure out what is goodness value and how it differs from niceness? Also, how each of them contribute to scheduling? 回答1: AFAIK: Each process in the run queue is assigned a " goodness " value which determines how good a process is for running. This value is calculated by the goodness() function. The process with higher goodness will be the next process to run. If no process is available for running, then the

问题 I have a simple mono-threaded application that does almost pure processing It uses two int buffers of the same size It reads one-by-one all the values of the first buffer each value is a random index in the second buffer It reads the value at the index in the second buffer It sums all the values taken from the second buffer It does all the previous steps for bigger and bigger At the end, I print the number of voluntary and involuntary CPU context switches If the size of the buffers become

问题 I am trying to develop a function which would enable the Kernel (Android kernel: 4.9.59) to send a message to an/many userspace application and I have followed this example: Kernel to userspace application communication However, when I am trying to call the message conveying function from the scheduler I am receiving the following error: Fatal exception PC is at netlink_broadcast_filtered+0x24/0x3d4 LR is at netlink_broadcast+0x14/0x20 Inside the kernel scheduler (kernel/sched) I have created

问题 ENV: https://github.com/puckel/docker-airflow VERSION :1.8.1-1 Executor : LocalExecutor DAG SETTING: start_date: datetime(2018, 1, 8) schedule_interval : daily Current time:[2018-01-11 06:23:00] Question : Why the dag d3's run_id=[scheduled__2018-01- 11 T00:00:00] has not been triggered at the current time[2018-01-11 06:23:00] ? Current time [2018-01-11 06:23:00] , is there any way to schedule trigger the d3's run_id=[scheduled__2018-01- 11 T00:00:00] ,not [scheduled__2018-01- 10 T00:00:00]