simple pool

Python crawler practice (iii) -------- sogou article (IP proxy pool and user proxy pool settings ---- scrapy ), In learning the scrapy crawler framework, it will certainly involve setting the IP proxy pool and User-Agent pool to avoid anti-crawling of websites. In the past two days, I watched a video about sogou's arti

Modify the conf/server. xml file Easy Configuration Step 1: Open the shared Thread Pool Name = "Catalina"> Name = "tomcatthreadpool" nameprefix = "Catalina-Exec -" Maxthreads = "1000" minsparethreads = "50" maxidletime = "600000"/> Name = "tomcatthreadpool" nameprefix = "Catalina-Exec-" maxthreads = "1000" minsparethreads = "50" maxidletime = "600000"/>Comments before and after the default value NameThe name used to reference this

Database connection pool: (inside put a lot of connection data links, responsible for allocation, management, release database connection, reusable connection, but not new) for data Unified connection to establish a buffer pool, put a certain database connection, use in the buffer pool inside take, and then back to the buffer

the problems raised in the "Memory Pool Design" section, solution 1 has the following features: After the program starts, there is no memory block in the memory pool. It takes over the memory block management only when the program is applied for and released; This memory pool does not limit the size of the application to be submitted. It creates a linked list

before the sqlconnection object stops working. to process a row set, you can pass the datareader to another routine in the application, but you still need to ensure that the datareader and its connection are closed. If you do not close sqlconnection, the code will "leak" the connection for each operation, so the connection pool accumulates the connection and eventually overflows. Unlike in ADO and Visual Basic (VB) 6.0 ,. The. NET garbage collector w

Thread Pool and work queue-Linux general technology-Linux programming and kernel information. The following is a detailed description. One of the most common problems posted on our multi-threaded Java programming forum is "How to Create a thread pool ?". Thread Pool and working queue problems may occur in almost every server application. In this article, Brian Go

Locate the desktop pool in the Directory drop-down menu in the Horizon View Web Console, click Add, open the Add Desktop Pool Wizard, select the Type automatic desktop pool2. Set User Assignment type3. Select Instant clone on vcenter Server Page4. Set the desktop pool identity5. Set Desktop Pool settings6. Configure de

Comparison of databases connected before and after the connection pool and database connected before and after the connection pool First, why JDBC? JDBC refers to java database connection and is oriented to relational databases. It is actually a JAVA encapsulated API. We use Java to execute SQL statements and perform (various) database operations, cross-platform. No matter what the database is, we can use j

connections is the standard for the number of IIS connections exposed by the virtual host, and if the number of IIS connections purchased is 50, then we have to consider the content framework and volume of the siteIf there are enough pictures of the website, pop-up window random (may even time selection box, simple condition filter box also with pop-up new window), plus the forced to open a new page to browse content, then only can tolerate 10 people

Using the thread pool for optimal resource utilization the most common problem in the Java Multithreaded Programming Forum is the various versions of the "How can I create a thread pool?" "In almost every server application, there are problems with thread pools and work queues. In this article, Brian Goetz shares the thread pool principle, basic implementation an

pool for execution pool.execute (t1); //Close thread pool pool.shutdown (); newscheduledthreadpool: Create a thread pool of unlimited size. This thread pool supports the need to schedule and periodically perform tasks.Examples of how to use 1234567891011 Executorservice

PackageCom.chauvet.utils.threadPool;ImportJava.util.concurrent.ExecutorService;Importjava.util.concurrent.Executors;/*** * * Create a thread pool to control the maximum number of concurrent threads, and the excess threads will wait in the queue. * * The size of a fixed-length pool is best set based on system resources. * such as: Runtime.getruntime (). Availableprocessors () (number of processors available

13. submit method of ThreadPoolExecutor thread pool, submit of java Thread Pool Jdk1.7.0 _ 79 In the previous article ThreadPoolExecutor thread pool Principle and Its execute method, we mentioned the ThreadPoolExecutor principle of the thread pool and Its execute method. This article analyzes ThreadPoolExecutor # submi

Net website error information: Note:An error occurred while executing the current Web request. Check the stack trace information for details about the error and the source of the error in the code.Exception details:System. invalidoperationexception: the timeout has reached. The timeout time has reached, but the connection has not been obtained from the pool. This may occur because all pool connections are i

List several thread pool implementations: [1] executorservice Http://www.gznc.edu.cn/yxsz/jjglxy/book/Java_api/java/util/concurrent/ExecutorService.html [2] scheduledexecutorservice Http://www.gznc.edu.cn/yxsz/jjglxy/book/Java_api/java/util/concurrent/ScheduledExecutorService.html [3] threadpoolexecutor Http://www.gznc.edu.cn/yxsz/jjglxy/book/Java_api/java/util/concurrent/ThreadPoolExecutor.html [4] scheduledthreadpoolexecutor Http://www.gznc.edu.cn/y

+1Q.join ()#block until all data in a queue has been processedq.get () fetch message q.task_done ()#Count-1 after the get-to message has been processed, the queue is told after processing is finished#The queue can only hold the number of parameters set when the instantiation, the queue is not full will continue to put#use the. Task_done () after using Joinablequeue,get () so that the join on the put end of the queue will not block after the last call to Task_donemultiprocessing. Pipecon,pro= Pip

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

Java connection pool technology and Java connection pool technology How to Use JNDI (Java Naming and Directory Interface) is an application Interface that provides developers with a universal and unified Interface for searching and accessing various Naming and Directory services, JDBC is built on the abstraction layer. JNDI provides a unified method for searching and accessing services on the network. By sp

modules to limit the number of process and thread pool priorities; The process thread pool encapsulates the functionality of the processes, thread modulesdef communicate (CONN,CLIENT_ADDR):While True: # Communication LoopsTrydata = CONN.RECV (1024)If not data:breakConn.send (Data.upper ())Except Connectionreseterror:BreakConn.close ()def server ():Server=socket (Af_inet,sock_stream)Server.bind (' 127.0.0.1

1 has the following features: After the program starts, there is no memory block in the memory pool. It takes over the memory block management only when the program is applied for and released; This memory pool does not limit the size of the application to be submitted. It creates a linked list for each size value for memory management; This solution does not provide the function of limiting the memory