lilo pool

CodeWhen writing a crawler, performance is consumed primarily in IO requests, which inevitably cause a wait when the URL is requested in single-threaded mode, which slows down the overall request.ImportRequests fromConcurrent.futuresImportThreadpoolexecutor#Introducing thread pool modulesdefasyns_url (URL):Try: Response=requests.get (URL)exceptException as E:Print('Exception Results', Response.url,response.content)Print('Get Results', Response.url, re

Label:Tomcat used COMMONS-DBCP as the implementation of connection pooling in versions prior to 7.0, but there are some problems with DBCP:(1) DBCP is single-threaded, in order to ensure that the line Shuo plenary lock the entire connection pool(2) Poor performance of DBCP(3) DBCP is too complex, more than 60 classes, development lag.As a result, other high-performance connection pools, such as C3P0, and Druid of the Ali system, are often used in the

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

Better use of JAVA thread pool and JAVA Thread Pool This article describes the thread pool size parameters, creation of working threads, collection of Idle threads, use of blocked queues, task denial policies, and thread pool hooks. use, some details are involved, including the selection of different parameters, differ

C3P0 connection pool, DBCP connection pool, C3P0 connection pool: Profile: c3p0-config.xml Test: Data preparation: CREATE DATABASE mybase;USE mybase;CREATE TABLE users(uid INT PRIMARY KEY AUTO_INCREMENT,username VARCHAR(64),upassword VARCHAR(64));INSERT INTO users (username,upassword) VALUES("zhangsan","123"),("lisi","456"),("wangwu","789");SELECT * FROM users;V

High-concurrency epoll + thread pool, business in the thread pool-ehyyngp-chinaunix blog High-concurrency epoll + thread pool, with the business in the thread pool 21:48:49 Category:C/C ++ Epoll is a perfect solution for High-concurrency servers in Linux. Because it is triggered based on events, it is more th

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

Write a thread pool in Linux and some usage and notes of the thread pool. -->Thread Pool Introduction(Mostly from the Network) In this section, we will detail the role of the thread pool, its technical background, and some services it provides. Most of the content comes from some conceptual things I learned on the Inte

Program causes the application pool of the IIS server to stop, and the application pool of the iis server to stop. When the program runs to a certain step, the application pool stops automatically. The results are consistent after several attempts. There are several reasons for this result: 1: This IIS6.0 will be suspended when the SP1 Patch Is Not Installed, bu

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

. NET thread pool technology for multi-task batch processing,. net thread pool for multi-taskI. Introduction to multi-thread technology application scenarios This article also shares with you the real business scenarios that arms has encountered in its actual work. Please follow arms's perspective on how to use the SmartThreadPool thread pool technology based on

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

Simple use of thread pool, simple use of Thread Pool Create a thread pool with a specified number of threads private static ExecutorService scheduledTaskFactoryExecutor = null;private boolean isCancled = false;private static class ThreadFactoryTest implements ThreadFactory { @ OverridePublic Thread newThread (Runnable r ){Thread thread = new Thread (r );Thread. s

Android thread and thread pool ----- AsyncTask (1) android development art and exploration, asynctask Thread Pool Threads are an important concept in android. In terms of usage, threads are divided into the main thread and sub-thread, the main thread is responsible for page-related, and the sub-thread is responsible for time-consuming operations.In android, besides the Thread itself, there is also AsyncTask

Use jar Packs: Commons-dbcp-1.4.jar, Commons-pool-1.6.jar, Commons-logging-1.1.3.jar, plus JDBC driver for the database, for JAVA6 and above platforms Connection Pooling Management class Copy Code code as follows: Package cn.songxinqiang.samples.commonsdbcp.util; Import java.sql.Connection;Import Java.sql.DatabaseMetaData;Import java.sql.SQLException;Import java.util.Properties; Import Javax.sql.DataSource; Import Org.apache.common

We have gained a lot today and have a thorough understanding of value transfer and the string pool. 1. First, string does not belong to eight basic data types. String is an object. Because the default value of an object is null, the default value of string is also null, but it is a special object and has some features that other objects do not have. 2. Both new string () and new string ("") declare a new null string, which is an empty string or not nu

#include REF is used for reference count Manangement. If a classinherits from Ref.Class Ref is a reference count class that is used to manage the reference count of objects.This does not occur and the pointer remains pointing to the object, and when the pointer operation is used, it is assumed that the object pointed to is destroyed and a program exception occurs.class Cc_dll Ref{Public:void retain ();//Add Reference count oncevoid Release ();//Decrease the reference count once, assuming that th

1. The connection pool case package Com.csdn.uil; Import java.io.IOException; Import Java.io.InputStream; Import Java.io.PrintWriter; Import Java.lang.reflect.InvocationHandler; Import Java.lang.reflect.Method; Import Java.lang.reflect.Proxy; Import java.sql.Connection; Import Java.sql.DriverManager; Import java.sql.SQLException; Import java.util.LinkedList; Import java.util.Properties; Import Javax.sql.DataSource; /** * Own a connection

11th Chapter Windows thread pool11.1 traditional Windows thread pool and API11.1.1 traditional thread pool objects and their corresponding APIs Thread Pool object API Normal task thread pool QueueUserWorkItem Timer thread

) __max_bytes) { free (P); return; } /* find the right list, reclaim chunks and adjust the list */ my_free_list=free_list+__freelist_index (n) ; q->free_list_link=*my_free_list; *my_free_list=q; } the release process is nothing to say, then look at the Fill list function Refill:code:staticvoid*refill (size_t n) { intnobjs=20; char*chunk=chunk_alloc (N,NBSP;AMP;NOBJS); obj*volatile*my_free_list; obj*result; obj*current_obj, *next_obj; inti; if (nobjs==1) returnchunk; my_fre