scheduler

问题 This seems to be a basic question, but i couldn't find answer anywhere in googling it. As Far As I Understand, scheduler latency is the time incurred in making the task runnable again. I mean, if there are 100 processes namely 1, 2, e.t.c, then they are executed let's say in order starting from 1. So the latency is the time that the process 1 is executed again. which means that the latency is the waiting time of the process as well as the waiting time of it when it is in runqueue ready to

问题 I'm not really sure what is the best way to initialize Quartz to schedule a cron job. My environment is Tomcat. I have one job that needs to be triggered every day. Should I create a separate Servlet to initialize Quartz and schedule my job? I'm thinking of creating a Servlet and on the init() schedule my job something like this: SchedulerFactory sf=new StdSchedulerFactory(); Scheduler sched=sf.getScheduler(); JobDetail jd=new JobDetail("job1","group1",CronJob.class); CronTrigger ct=new

问题 I'm running my application inside Glassfish. I tried to create a job, which will be executed every 5 minutes like this: @Startup @Singleton @LocalBean public class TempFolderCleaner { private final static Logger LOGGER = LoggerFactory.getLogger(TempFolderCleaner.class); @EJB private ReportStatusDao reporStatusDao; @Schedule(minute = "*/5") public void removeOldReports() { LOGGER.debug("start removeOldReports()"); } } However, it is never called. I tried to see a message from the logger and to

问题 I wanted to know if a copy of schedule() function runs on each processor, or is it just one schedule() running for each processor. If there is a copy of schedule() running on each processor/core, how are the processes dispatched to a particular CPU/cpu runqueue. Is it the job of load balancer? Is there only one load balancer running for all CPU's or it is done in a distributed fashion using flags/communication method? ps- I know the working of scheduling classes etc but I am having a hard

问题 I am using quartz scheduler for scheduling jobs.I have a case where i want to execute a job every day night(9:00 PM) to next day morning(06:00 AM).How can i achieve this.Currently i am initializing trigger like this Trigger trigger2 = newTrigger() .withIdentity("trigger1", "group1") .startNow() .withSchedule(simpleSchedule() .withIntervalInSeconds(10) .repeatForever()) .build(); What modification i need to make to satisfy the requirement? 回答1: If you have opt for the Quartz CronExpression you

问题 Basically, I'm implementing a scheduler for the xv6 kernel that is implementing a multilevel priority queue. I'm having a serious issue I do not understand, the TAs for my course do not understand, and I've missed the deadline for this project, so helping me right now will not gain me any extra points - but I WANT to know why I'm having the following behavior... First, this is the original scheduler that I'm changing for xv6 (for comparison - this is NOT my implementation): // Per-CPU process

问题 I want to use akka's scheduler in my play 2.0(using java) framework application to send email reminders on a particular date and time.I am new to play 2.0. Please tell me the procedure to use the akka scheduler in play 2.0 framework if anyone knows (in detailed) ? Thanks in advance. 回答1: I'm new as well, and have another question related to Akka in Scala. But while reading i found that this might be helpful to you: http://www.playframework.org/documentation/2.0/JavaAkka and perhaps this as

问题 Today I found a very strange problem. I ran Redhat Enterprise Linux 6, and the CPU was Intel E31275 (4 cores, 8 threads). I found one kernel thread (I called it as my_thread) didn't work correctly. With "ps" command, I found the status of my_thread was always running: ps ax 5545 ? R 3:14 [my_thread] 15774 ttyS0 Ss 0:00 -bash ... But its running time was always 3:14. Since it ws running, why didn't the total time increase? From the proc file /proc/5545/sched, I found the all statistics

问题 I know a Process control Block is maintained in Kernel, the question is: If Process X is being run in the CPU, and a context switch occurs, will the process linked to the PCB of process X be run ? Or a random process in the ready queue will be run ? taking into consideration all processes have the same priority. Thanks in advance! 回答1: If the process X spent its quanta, the scheduler will be called. If there is other process of higher or same dynamic priority, then context switch will occur.

问题 I am trying to get a simple example of the Quartz scheduler working in JBoss Seam 2.2.0.GA. Everything works fine using the RAMJobStore setting, but changing the store from org.quartz.jobStore.class = org.quartz.simpl.RAMJobStore to org.quartz.jobStore.class org.quartz.impl.jdbcjobstore.JobStoreCMT org.quartz.jobStore.driverDelegateClass org.quartz.impl.jdbcjobstore.PostgreSQLDelegate org.quartz.jobStore.useProperties false org.quartz.jobStore.dataSource quartzDatasource ## FIXME Should be a