scheduler | 易学教程

Context switch internals

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问题 I want to learn and fill gaps in my knowledge with the help of this question. So, a user is running a thread (kernel-level) and it now calls yield (a system call I presume). The scheduler must now save the context of the current thread in the TCB (which is stored in the kernel somewhere) and choose another thread to run and loads its context and jump to its CS:EIP . To narrow things down, I am working on Linux running on top of x86 architecture. Now, I want to get into the details: So, first

DBMS_JOB vs DBMS_SCHEDULER

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问题 What is the difference between DBMS_JOB and DBMS_SCHEDULER ? 回答1: From other forums: Although dbms_job still exists in 10g and 11g, Oracle recommends the use of dbms_scheduler in releases 10g and up. No new features are being added to dbms_job and you will likely quickly run into its limitations. dbms_scheduler is more robust and fully-featured than dbms_job and includes the following features that dbms_job does not have : logging of job runs (job history) simple but powerful scheduling

How to create a new Linux kernel scheduler

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问题 Looking through the scheduler source code (2.6.34, kernel/sched.c), I can see how the "pluggable" schedulers are used, and I believe I understand the interface to be implemented. What I don't understand yet is how to get my code built into the kernel. At the very least, pointers to other sites would be appreciated. Right now, I'm grepping for SCHED_FIFO, SCHED_RR, and SCHED_NORMAL in the kernel source tree, so really I'm looking for a more insightful way to look at it :-) EDIT: As some

Running a JAVA program as a scheduled task

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问题 I am trying to run a simple JAVA program once per day on a Windows 7 machine. My code runs fine inside NetBeans. If I do a clean and build it suggests this: C:\Program Files\Java\jdk1.7.0/bin/java -jar "C:\Users\User1\Documents\NetBeansProjects\Facebook\dist\Facebook.jar" This does not work from the DOS prompt of course because of the space between program and files so I do this: C:\Program Files\Java\jdk1.7.0/bin/java -jar "C:\Users\User1\Documents\NetBeansProjects\Facebook\dist\Facebook.jar

How to schedule task daily + onStart() in Play 2.0.4?

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问题 I need to execute a piece of code 1 time everyday in playframework2.0.4 when I try to do with the class extends GlobalSettings it works. But it works for every instance requesting. I want it works when server starts and does its duty everyday 1 time. package controllers; import java.util.concurrent.TimeUnit; import akka.util.Duration; import play.Application; import play.GlobalSettings; import play.libs.Akka; public class ParserJobApp extends GlobalSettings{ @Override public void onStart

GWT: Timer and Scheduler Classes

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问题 I have read this page over several times, and am just not seeing some of the inherent differences between GWT\'s Timer and Scheduler classes. I\'m looking for the use cases and applicability of each of the following: Timer , Timer::schedule and Timer::scheduleRepeating Scheduler::scheduleDeferred Scheduler::scheduleIncremental IncrementalCommand DeferredCommand These all appear to be doing the same thing, more or less, and it feels like you can accomplish the same objectives with all of them.

MySQL Event Scheduler on a specific time everyday

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问题 Here\'s my query CREATE EVENT reset ON SCHEDULE AT TIMESTAMP DO UPDATE `ndic`.`students` SET `status` = \'0\'; How can I update status to \"0\" at 1 pm every day. What should I put instead of TIMESTAMP? 回答1: This might be too late for your work, but here is how I did it. I want something run everyday at 1AM - I believe this is similar to what you are doing. Here is how I did it: CREATE EVENT event_name ON SCHEDULE EVERY 1 DAY STARTS (TIMESTAMP(CURRENT_DATE) + INTERVAL 1 DAY + INTERVAL 1 HOUR)

How can I run an external command asynchronously from Python?

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I need to run a shell command asynchronously from a Python script. By this I mean that I want my Python script to continue running while the external command goes off and does whatever it needs to do. I read this post: Calling an external command in Python I then went off and did some testing, and it looks like os.system() will do the job provided that I use & at the end of the command so that I don't have to wait for it to return. What I am wondering is if this is the proper way to accomplish such a thing? I tried commands.call() but it will not work for me because it blocks on the external

Python script to do something at the same time every day [duplicate]

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问题 This question already has answers here : How do I get a Cron like scheduler in Python? [closed] (18 answers) Closed 3 years ago . I have a long running python script that I want to do someting at 01:00 every morning. I have been looking at the sched module and at the Timer object but I can\'t see how to use these to achieve this. 回答1: You can do that like this: from datetime import datetime from threading import Timer x=datetime.today() y=x.replace(day=x.day+1, hour=1, minute=0, second=0,

How can I run an external command asynchronously from Python?

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问题 I need to run a shell command asynchronously from a Python script. By this I mean that I want my Python script to continue running while the external command goes off and does whatever it needs to do. I read this post: Calling an external command in Python I then went off and did some testing, and it looks like os.system() will do the job provided that I use & at the end of the command so that I don\'t have to wait for it to return. What I am wondering is if this is the proper way to