simple pool

Introduction The Python standard library provides us with the threading and multiprocessing modules to write the corresponding multithreaded/multi-process code, but when the project reaches a certain scale, frequent creation/destruction of processes or threads is very resource intensive, and this time we will write our own thread pool/ Process pool, with space to change time. But starting with Python3.2, th

Background: The latest project needs to invoke the HTTP interface, so I intend to use the latest HttpClient client to write a tool class, write well later in the actual application process encountered some problems, because the amount of dataLarge, each processing about 600-700 requests, the average count down to 20 minutes, although the speed is running in the scheduled task, but also unbearable, so with this blog.1. The first thought of the solution is the multi-line Cheng request, but this ha

Create a data source (Create a database connection pool) and a glassfish connection pool in glassfish 1. Enter http: // localhost: 4848 in the browser to log on to the glassfish Domain Management Console. The default username and password are amin and adminadmin. (You can also right-click the NetBeans service tab -- server -- GlassFishServer -- to view the Domain Management Control Center) 2. Create a dat

"thread pool?" How to design a dynamic size thread pool, what are the methods? "thread pool: as the name implies, Create a number of executable threads in a pool (container) beforehand. Getting threads from the pool when needed does not have to be created on their own,

-bit value is 000. STOP -the corresponding high 3-bit value is 001. tidying -the corresponding high 3-bit value is 010. TERMINATED -the corresponding high 3-bit value is 011.The switch between the various states of the thread pool is as follows:1. RUNNING(01) Status Note: When the thread pool is in the running state, it is able to receive new tasks and process the added tasks.(02) State Toggle: The

little larger than 64 MB. Adding these three pools does not Show the variable area size shown in Show sga. That's because in addition to the three pools, variable areas also have administrative information such as the X $ structure.This view can be used in 9i and 10g, but another view in 10g can provide more accurate information about the size of the Shared Pool. Next, let's take a look at the improvements made to memory management in 10 Gb.3. Set th

Details about tomcat connection count and thread pool, and details about tomcat Thread PoolPreface When using tomcat, you often encounter configuration problems such as the number of connections and the number of threads. To really understand these concepts, you must first understand Tomcat Connector (Connector ). The previous article details the Tomcat configuration file server. written in xml: the main function of Connector is to receive connection

to the point, to let that line of test code normal operation, the solution is very simple, the virtual account permissions to join the folder security permissions can, but the problem is: This virtual account we are not visible, if you directly add a user named Luckty to the folder security account, It doesn't make sense. (prompted not to find the Luckty user), that the virtual account name is not "Luckty" Key: Manually Enter the IIS Apppool\luckty

Basic applications of the Java thread pool and java Thread PoolUnderstanding: basic usage of atomic operationAfter Java 5, it added a lot of multi-threaded content and became a concurrent thread library.In the java. util. concurrent package and the sub-package's API help documentation, there is content related to the concurrent LibraryIn the java. util. concurrent. atomic package, there are operations on basic data, basic data in the array, and basic

The database connection pool is responsible for allocating, managing, and releasing database connections. During database connection pool initialization, a certain number of database connections are created and placed in the connection pool, the number of connections to these databases is set by the minimum number of connections to the database. Whether or not th

First, about the Concurrent.futures moduleThe Python standard library provides us with the threading and multiprocessing modules to write the corresponding asynchronous multithreaded/multi-process code. Starting with Python3.2, the standard library provides us with concurrent.futures modules that provide ThreadPoolExecutor and ProcessPoolExecutor two classes of Threadpoolexecutor and processpoolexecutor inherit executor, Code that is used to create the thread

IntroductionIn Android, we usually use Android's messaging mechanism to communicate between threads, and this mechanism passes exactly the message.Usually. We use Message.obtain () and Handler.obtainmessage () to get a message from the message pool. Avoid constructing a message directly. So does Android cause oom because of the message pool cache message object? For this question, I can unders

In the network programming frequently uses the thread pool and the connection pool, today has done a simple contrast analysis to the common thread pool's basic application scene and the model. 1, Business process comparison A, non-threading pool business Flow model: The figure above identifies the basic non thread

What about the application pool? This is a brand new concept of Microsoft: The application pool is a configuration that links one or more applications to one or more worker processes. Because applications in the application pool are separated from other applications by working process boundaries, applications in an application

The libvirt Storage section is studied. A simple example is used for test and verification: Import lib1_conn = libvirt. open ('qemu: // system') # conn = libvirt. open ('qemu: // system ') xmldesc = ''' Output result: virttest1 Delete storage volumes and storage pools Import lib1_conn = libvirt. open ('qemu: // system') # conn = libvirt. open ('qemu: // system ') ''' Delete pool vol ''' storage _

our business logic processing return 2 + 3 ;}} We implement a Callable interface to process our tasks, and then use Future to obtain the task results. If the Executor background thread pool has not completed Callable calculation, this call returns the get () method of the Future object, blocking until the calculation is complete. This is why InterruptedException exceptions need to be captured. Is this similar to our Android download task. Star

thread pool. shutdown (); NewScheduledThreadPool: Creates an infinite thread pool. This thread pool supports regular and periodic task execution requirements.Example 1234567891011 //// Create a thread pool that can be scheduled to run com

Abstract This article introduces the working principle of the JDBC-based database connection pool, describes the transaction processing and multi-database servers of the connection pool technology. Various key technologies propose an efficient connection pool management policy. At last, the specific implementation process of the database connection

packagetest;importorg.apache.commons.pool.poolableobjectfactory;import org.apache.commons.pool.impl.genericobjectpool;importorg.apache.log4j.logger;import com.gargoylesoftware.htmlunit.browserversion;import com.gargoylesoftware.htmlunit.nicelyresynchronizingajaxcontroller;import Com.gargoylesoftware.htmlunit.webclient;//http://blog.csdn.net/m13321169565/article/details/8081410public classpooledclientfactory{privatestaticloggerlog= logger.getlogger (Pooledclientfactory.class);privatefinalstatic P

Ask: When a thread enters the synchronized method A of an object, whether other threads can enter synchronized method B of this object. For: No. Other threads can access only the asynchronous method of the object, and the synchronization method cannot enter. Because the synchronized modifier on a non-static method requires that the object's lock be obtained when the method is executed, the thread attempting to enter the B method can only wait for the object's lock in the lock