lilo pool

Optimization Technology --- Object pool optimization project, --- Object pool project Another year! Today I am going to explain to you a very common optimization technology-using the object pool to optimize the project.I don't need to talk much about it. This article can be used together with the memory optimization mentioned in my previous blog!First, let's exp

Simple RPC framework-Business thread pool and rpc framework Thread PoolNetty thread model Netty's thread model is mainly based on React. Due to different application scenarios, multiple versions have been developed.Single thread mode That is, a thread is used to receive service requests and execute IO operations. Because I/O multiplexing is used, therefore, the single thread mode can solve some of the problems in scenarios where the request volume is

Another project error is reported today: Timeout expired. The timeout period elapsed prior to obtaining a connection from the pool. This may have occurred because all pooled connections were in use and Max pool size was reached. The first response is that the brother wrote datareader and did not close it. This does not start to look for datareader in the whole project. Well, let alone, there are two

Comprehensive reference A. c ++ application performance optimization, Chapter 6th: Memory PoolHttp://www.ibm.com/developerworks/cn/linux/l-cn-ppp/index6.html And B. Design of ARP memory pool. Http://www.cnblogs.com/bangerlee/archive/2011/09/01/2161437.html 1. memblock Typedef struct memblock {uint32_tindex; // sizeuint32_tnfree; // the minimum number of available memory units uint32_tnfirst; // The next smallest available memory unit number struct mem

Connect to the simple and multi-threaded series 4, The creation and destruction of thread objects is a need to spend system resources, through the thread pool, can avoid this problem and improve the system response time. This situation is similar to the database connection pool we often refer to. The wide application of thread pools has enabled the support of the thread

This section describes free lists and shared pool lru list.1. The chunk size in the shared pool is different, but it is continuous.2. Because the chunk is the smallest unit for allocation, the session will apply in chunk units when it needs to allocate space to the object.3. The available chunk (free) will form a chain table feee lists, so that you can find the available suitable chunk through the traversal

Describes the free lists and shared pool LRU list. Allocation of chunk in Shared pool 1, the size of the chunk in the shared pool is not the same, but is continuous 2, because chunk is the smallest unit allocated, so the session needs to allocate space for the object, will be chunk for the unit to apply 3, available chunk (free) will form a linked list feee l

In the network programming often uses the thread pool and the connection pool, today the common thread pool's basic application scenario and the model makes a simple contrast analysis.1. Business process comparison A, Non-threading pool business Flow model: Identifies the basic thread model of a non-thread pool, the

PHP-FPM process pool probing, php-fpm pool probing PHP supports multi-process rather than multi-thread; PHP-FPM runs multiple sub-processes in the process pool to process all connection requests concurrently. View the PHP-FPM process pool (pm. start_servers = 2) status through ps as follows: root@d856fd02d2fe:~# ps aux

The thread pool in AndroidBenefits of the thread pool:1 reusing threads in a thread pool to avoid the performance overhead of thread creation and destruction2 can effectively control the maximum number of concurrent, avoid a large number of threads because they like to rob resources and cause blocking3 ability to easily manage threads, provide timed execution and

three important parameters for Tomcat connection pool The three key parameters of the Tomcat connection pool, the configuration of the connection pool is very important, the configuration is not easy to cause the operation of the program is stable, the following common problems summed up under: A. If set to true Tomcat automatically checks for recovery reuse and

The IIS6 application pool is automatically disabled. Service unavailable application pool 'defaultapppool 'is automatically disabled because a series of errors occur in the process that provides services for the application pool. Application-specific permission settings do not grant the user nt authority/favorites Local activation permission for the COM server ap

Python Lesson 5-custom thread pool and python Thread PoolSummary: 1. low version Thread Pool 2. Out-of-print Thread Pool 1. low version Thread Pool Design Concept: Using queue Put the Thread class name in the queue and execute one to get it. 1 import queue 2 import threading 3 4 5 class ThreadPool (object): 6 7 def _ i

Java thread pool application, java Thread Pool The Executors tool class is used to create Java thread pools and timers. NewFixedThreadPool: Creates a thread pool that can reuse a fixed number of threads and runs these threads in a shared unbounded queue. In any sense, in mostNThreadsThe thread is in the active state of the processing task. If an additional task i

Reprinted: 1. Problem DescriptionWebProgramIt was very fast at the beginning of Tomcat, but after a while it was found that the speed became very slow.Check log output and find exceptions as follows:Org. Apache. commons. DBCP. sqlnestedexception: cannot get a connection, pool exhausted, cause:Java. util. nosuchelementexception: timeout waiting for idle objectAt the same time, in the sqlserver event probe, it is found that each SQL statement is exec

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

Implementation of process multi-processes by means of inheritance1 fromMultiprocessingImportProcess2 Import Time3 4 classmynewprocess (Process):5 defRun (self):6 forIinchRange (10):7 Print("----Run----")8Time.sleep (1)9 Ten One if __name__=="__main__": Ap =mynewprocess () - -P.start ()#the Start method in process actively calls the Run method the forIinchRange (10):Print("---main---") Time.sleep (1)Pool process pooling for

Tags: cal common data Source Comm HTTPS creates interface complex RGScollection (+) Tomcat has been using COMMONS-DBCP as a connection pool for the previous version of 7.0, but DBCP has been criticised for the following reasons: DBCP is single-threaded, in order to ensure that the entire connection pool is locked by the line Shuo plenary DBCP Poor performance DBCP is too complex, more than

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