scheduling

fitting n variable height images into 3 (similar length) column layout

若如初见. 提交于 2019-11-27 04:27:08
I'm looking to make a 3-column layout similar to that of piccsy.com . Given a number of images of the same width but varying height, what is a algorithm to order them so that the difference in column lengths is minimal? Ideally in Python or JavaScript... Thanks a lot for your help in advance! Martin How many images? If you limit the maximum page size, and have a value for the minimum picture height, you can calculate the maximum number of images per page. You would need this when evaluating any solution. I think there were 27 pictures on the link you gave. The following uses the first_fit

How Linux handles threads and process scheduling

ぃ、小莉子 提交于 2019-11-27 03:13:50
I'm trying to understand how Linux handles process scheduling and thread scheduling. I read that Linux can schedule both processes and threads. Does Linux have a thread scheduler AND a process scheduler? If yes, how do they cooperate? The Linux kernel scheduler is actually scheduling tasks, and these are either threads or (single-threaded) processes. So a task (a task_struct inside the kernel), in the context of the scheduler, is the thing being scheduled, and can be some kernel thread like kworker or kswapd , some user thread of a multi-threaded process (like firefox ), or the single-thread

How to parameterize @Scheduled(fixedDelay) with Spring 3.0 expression language?

半腔热情 提交于 2019-11-27 02:55:10
When using the Spring 3.0 capability to annotate a scheduled task, I would like to set the fixedDelay as parameter from my configuration file, instead of hard-wiring it into my task class, like currently... @Scheduled(fixedDelay = 5000) public void readLog() { ... } Unfortunately it seems that with the means of the Spring Expression Language (SpEL) @Value returns a String object which in turn is not able to be auto-boxed to a long value as required by the fixedDelay parameter. I guess the @Scheduled annotation is out of question. So maybe a solution for you would be to use task-scheduled XML

How to execute code in c# service one time per day at the same hour?

非 Y 不嫁゛ 提交于 2019-11-27 02:22:01
问题 So here's my problem, I need to do a c# service running on a server who's getting file on ftp one time per day at 3am. I think that I can do it with a thread.sleep() or by compare the DateTime.Now with 3am.... Do you have better solution? Thank you very much for your help! 回答1: Write a console app or equivalent, and use the Windows Scheduler (or whatever it's called nowadays...) to run it daily. 回答2: I've used Scheduled Tasks successfully for backups, but I have a word of caution ...

Run once a day

冷暖自知 提交于 2019-11-27 01:51:42
问题 Is there any clever method out there to make my executeEveryDayMethod() execute once a day, without having to involve the Windows TaskScheduler? Regards /Anders 回答1: Take a look at quartz.net. It is a scheduling library for .net. More specifically take a look here. 回答2: I achieved this by doing the following... Set up a timer that fires every 20 minutes (although the actual timing is up to you - I needed to run on several occasions throughout the day). on each Tick event, check the system

What is the best method for scheduled tasks in PHP

随声附和 提交于 2019-11-27 01:26:58
Title sums it up, I know little about how I will do this. See also: PHP: running scheduled jobs (cron jobs) Have you ever looked at ATrigger ? A PHP library is also available to create scheduled tasks without overhead. Disclaimer: I'm among their team. The best method for scheduled tasks is beanstalkd with delayed put. Use your operating system's scheduled tasks facility. crontab on unix, scheduled tasks on windows. Then we have some more considerations: Do you want to schedule tasks through a PHP script that adds stuff to the main OS way to schedule tasks? or Do you want to have a long

How can I see which CPU core a thread is running in?

隐身守侯 提交于 2019-11-27 00:02:18
问题 In Linux, supposing a thread's pid is [pid], from the directory /proc/[pid] we can get many useful information. For example, these proc files, /proc/[pid]/status,/proc/[pid]/stat and /proc/[pid]/schedstat are all useful. But how can I get the CPU core number that a thread is running in? If a thread is in sleep state, how can I know which core it will run after it is scheduled again? BTW, is there a way to dump the process(thread) list of running and sleeping tasks for each CPU core? 回答1: The

Class Scheduling to Boolean satisfiability [Polynomial-time reduction]

岁酱吖の 提交于 2019-11-26 23:57:35
问题 I have some theoretical/practical problem and I don't have clue for now on how to manage, Here it is: I create a SAT solver able to find a model when one is existing and to prove the contradiction when it's not the case on CNF problems in C using genetics algorithms. A SAT-problem looks basically like this kind of problem : My goal is to use this solver to find solutions in a lot of different NP-completes problems. Basically, I translate different problems into SAT, solve SAT with my solver

Timed Tasks (cron-like) in PHP

岁酱吖の 提交于 2019-11-26 23:08:36
问题 Is there a full featured, job scheduling package available for PHP? I'm looking for the PHP equivalent to Java's Quartz. I'm fine having things triggered externally from cron to drive the system. The functionality I'd be looking for: Ability to register task (class/method) to be called at given intervals. Ability to specify whether a given task can be run multiple times (potentially long running methods should not be run multiple times in certain cases). All registered entries/methods could

real time scheduling in Linux

一世执手 提交于 2019-11-26 22:37:37
问题 This morning I read about Linux real time scheduling. As per the book 'Linux system programming by Robert Love', there are two main scheduling there. One is SCHED_FIFO, fifo and the second is SCHED_RR, the round robin. And I understood how a fifo and a rr algorithm works. But as we have the system call, sched_setscheduler (pid_t pid, int policy, const struct sched_parem *sp) we can explicitly set the scheduling policy for our process. So in some case, two process running by root, can have