as hosts ). The Job scheduler generates multiple threads. Each thread contains code for executing different subtasks. Each thread migrates its code to different running servers. Then, each running server executes the code to be migrated to it and returns the result to the Job scheduler. Finally, the Job scheduler combines the results of each thread.This parallel cluster system is called a pseudo remote thread because the thread is scheduled on the Job scheduler, but the code in the thread is ex
The obstacle device is a kind of multithreading concurrency control method, the usage is very simple. Here's an example:
Import java.util.concurrent.BrokenBarrierException;Import Java.util.concurrent.CyclicBarrier;/*** Java Threads: New features-obstacles** @author Leizhimin*/public class Test {public static void Main (string[] args) {Create the obstacle and set the task to be performed for all maintask threads to reach the barrier point (Runnable)Cyclicbarrier cb = new Cyclicbarrier (7, New Ma
different running server. Each running server then executes the code that is migrated to it and returns the results to the job scheduler. Finally, the job scheduler combines the results of individual threads.
This parallel cluster system is called a pseudo remote thread because the thread is scheduled on the job scheduler, but the code inside the thread is executed on the remote computer.
What are the components of the system?
The term component refers to the logical module of a parallel clu
Java thread: The obstacle class is added to the new feature-obstacle Java 5. To meet a new design requirement, such as a large task, it is often necessary to assign many sub-tasks to execute. Only when all sub-tasks are completed can the sub-tasks be executed. At this time, you can select the barrier. Barrier is a method of multi-thread concurrency control, which is easy to use. The following is an example: import java. util. concurrent. brokenBarrierException; import java. util. concurrent. cyc
call-return in procedural processing:
Call: Create a subtask reactor, associate it with the parent task, and start it. We call this process as spawn.
Return: The onlinkreturn event of the parent task is triggered when the subtask is completed. In event processing, the parent task obtains information such as the completion status of the subtask, destroys the
subtaskXDoclet tasks are related to fields. XDoclet tasks in a specific field are composed of many closely coupled subtasks, each of these subtasks only executes a very specific and simple code generation task.[Definition: subtasks are the code generation process of a single object provided by a task.]A task provides the context for executing a subtask and manages the associated subtask organizations. The
Import java. util. concurrent. brokenBarrierException; import java. util. concurrent. cyclicBarrier; public class javasicbarriertest {public static void main (String [] args) {// create the javasicbarrier object, // and set the concurrent tasks for executing a group of five threads, execute the MainTask task CyclicBarrier cb = new CyclicBarrier (5, new MainTask (); new SubTask ("A", cb ). start (); new SubTask
main thread.Cyclicbarrier is that there are more child threads that are executed to a certain point after the execution continues. The focus is on the child threads. Cyclicbarriertest test = new Cyclicbarriertest (); Create the Maintask and set the task to be performed when all the fixed number of threads reach the barrier point (Runnable) cyclicbarrier cb = new Cyclicbarrier (7, Test.new Maintask ( )); Test.new SubTask ("A", CB
Topic Links:http://poj.org/problem?id=1236
Network of schools
Time Limit: 1000MS
Memory Limit: 10000K
Total Submissions: 11433
Accepted: 4551
DescriptionA number of schools is connected to a computer network. Agreements has been developed among those Schools:each School maintains a list of schools to which it distributes Softwa Re (the "Receiving schools"). Note th
. concurrent. concurrentLinkedQueue; public class Master {// Job Queue protected QueueWorkQueue = new concurrent1_queue(); // Worker Process queue protected Map
ThreadMap = new HashMap
(); // The subtask processing result set protected Map
ResultMap = new ConcurrentHashMap
(); // Whether all subtasks have ended public boolean isComplete () {for (Map. Entry
Entry: threadMap. entrySet () {
Topic Links:http://poj.org/problem?id=1236
Network of schools
Time Limit: 1000MS
Memory Limit: 10000K
Total Submissions: 11433
Accepted: 4551
DescriptionA number of schools is connected to a computer network. Agreements has been developed among those Schools:each School maintains a list of schools to which it distributes Softwa Re (the "Receiving schools"). Note th
(Master.iscomplete ()) {SYSTEM.OUT.PRINTLN ("The result of execution is:" + master.getresult ());Break}}Forkjoin thread PoolThe thread pool is a framework of parallel execution tasks introduced after Jdk7, and its core idea is to divide the task into subtasks.It is possible that the subtasks are still very large and need to be further disassembled, eventually getting a small enough task.The split subtasks are placed in a double-ended queue, and several boot threads get the task execution from t
Time Limit: 1000MS
Memory Limit: 10000K
Total Submissions: 11433
Accepted: 4551
DescriptionA number of schools is connected to a computer network. Agreements has been developed among those Schools:each School maintains a list of schools to which it distributes Softwa Re (the "Receiving schools"). Note that if B was in the distribution list of school A, then a does not necessarily appear in the list of school BYou is to write a program this computes
DescriptionA number of schools is connected to a computer network. Agreements has been developed among those Schools:each School maintains a list of schools to which it distributes Softwa Re (the "Receiving schools"). Note that if B was in the distribution list of school A, then a does not necessarily appear in the list of school BYou is to write a program this computes the minimal number of schools that must receive a copy of the new software in Ord Er for the software to reach all schools in t
This article starts in Infoq 1. What is the Fork/join framework
The Fork/join framework is a framework that JAVA7 provides for the parallel execution of tasks, a framework that divides large tasks into small tasks and eventually results in large tasks with the results of each small task.
We then fork and join these two words to understand the fork/join framework, fork is a large task cut into a number of subtasks parallel execution, join is to merge the implementation of these subtasks, and fina
This article starts in Infoq 1. What is the Fork/join framework
The Fork/join framework is a framework that JAVA7 provides for the parallel execution of tasks, a framework that divides large tasks into small tasks and eventually results in large tasks with the results of each small task.
We then fork and join these two words to understand the fork/join framework, fork is a large task cut into a number of subtasks parallel execution, join is to merge the implementation of these subtasks, and fina
the [%] task, [/] which indicates completion progress, and the value changes when the task changesInsert Time stampin Org You can insert a timestamp for each task, C-c C-s insert a schedule time, C-c C-t insert a deadline time, or C-c . insert a normal time directly.Time stamp can be added to the specific time, such as:
You can also add a time range, such as:
You can also add time that you want to repeat, such as:
Repeat daily and repeat once per wee
Network of schools
Time Limit: 1000MS
Memory Limit: 10000K
Total Submissions: 12015
Accepted: 4783
DescriptionA number of schools is connected to a computer network. Agreements has been developed among those Schools:each School maintains a list of schools to which it distributes Softwa Re (the "Receiving schools"). Note that if B was in the distribution list of school A, then a does not necessarily appear in the list of school BYou
The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion;
products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the
content of the page makes you feel confusing, please write us an email, we will handle the problem
within 5 days after receiving your email.
If you find any instances of plagiarism from the community, please send an email to:
info-contact@alibabacloud.com
and provide relevant evidence. A staff member will contact you within 5 working days.