java performance tuning tips

recommended to copy the library file tcnative-1.dll to the bin directory of Tomcat. In linux, you can directly decompress and install the tomcat_native.tar.gz file under the bindirectory. Before compiling, make sure that the APR library has been installed.How can I determine whether the APR library is enabled for Tomcat? The method is to view the Tomcat startup log:If APR is not enabled, the startup log generally contains the following:Org. Apache. Coyote. http11.http11protocol startIf APR is e

Mysql Tomcat C3p0 System Performance Tuning personal summary System Information The application logic is to use c3p0 to query data in the database and return Json data over http. 1. the initial test result JMeter test result before optimization No. Type Original 1000 data bigger 1 500 Connection 250 query/S 63q/S70q/S 2 1000 connections 255q/S 57q/S65 q

MYSQL should be the most popular WEB back-end database. The WEB development language has recently grown rapidly, with PHP, Ruby, Python, and Java features, although NOSQL has recently become more and more mentioned, but it is believed that most architects will still choose MYSQL for data storage. MYSQL is so convenient and stable that we rarely think about it when developing WEB applications. Even if the idea of optimization is program-level, for exa

Spark Source Analysis Reproduced: Http://blog.sina.com.cn/s/articlelist_2628346427_2_1.html Http://blog.sina.com.cn/s/blog_9ca9623b0102webd.html Spark Performance Optimization-------Development tuning reprint 2016-05-15 12:58:17 Development tuning, know spark basic development principles, including: RDD lineage design, operator rational use, special operation op

lower.using Ulimit to limit CPU timeNote that ulimit restricts the current shell process and its derived child processes. Therefore, you can call Ulimit in the script to limit the CPU usage time. For example, limit the CPU time for tar in seconds.If the tar takes longer than 100 seconds, tar exits, which may result in incomplete packaging, so it is not recommended to use Ulimit to limit CPU time. In addition, the user can be restricted by modifying the system's/etc/security/limits configuration

Detailed understanding and performance tuning of the JVM's garbage collection mechanism (ii) 2008-05-28 16:39 ReproducedGC Overview of 1.JVM 　　The GC, or garbage collection mechanism, is the memory that the JVM uses to free objects that are no longer in use. The Java language does not require the JVM to have a GC, nor does it specify how the GC works.

Summary of Oracle Performance Tuning recommendationsPrinciple One: Note the connection order in the WHERE clause:Oracle uses a bottom-up sequential parsing where clause, according to which the connection between tables must be written before other where conditions, and those that can filter out the maximum number of records must be written at the end of the WHERE clause.Especially "PRIMARY key id=?" "Such a

slower, the thread default life is one minute.————————————————————————————————— Split Line ———————————————————————————————————————Zuul default is to use semaphore isolation, and the size of the semaphore is 100, the requested concurrent thread more than 100 will be an errorYou can increase the maximum value of the semaphore to improve performance by configuring the following:Zuul: semaphore: 5000You can also use thread isolation instead, resizing

be sorted, or it can be added to a column (like joins or additions). Any non-indexed item in the ORDER BY statement, or a computed expression, will slow down the query. Double-check the order BY statement to find non-indexed items or expressions that degrade performance. The solution to this problem is to rewrite the order BY statement to use the index, or you can establish another index for the column you are using, and you should absolutely avoid u

Java. Combine the two sets of APIs and eliminate the reliance on zookeeper. It is said that performance has greatly improved OH ~ ~ list of all parameter configurations Broker default parameters and configurable list of all parameters:http://blog.csdn.net/lizhitao/article/details/25667831 Kafka principle, basic concept, broker,producer,consumer,topic all parameter configuration listhttp://blog.csdn.net/su

MySQL is a powerful open-source database. With more and more database-driven applications, people have been pushing MySQL to its limits. Here are 101 tips for adjusting and optimizing MySQL installation. Some of the techniques are specific to the installation environment, but these ideas are generic. I've divided them into several categories to help you master more of the tuning and optimization techniques

Label:MySQL is a powerful open-source database. With more and more database-driven applications, people have been pushing MySQL to its limits. Here are 101 tips for adjusting and optimizing MySQL installation. Some of the techniques are specific to the installation environment, but these ideas are generic. I've divided them into several categories to help you master more of the tuning and optimization techn

Tags: temp dispatch variable mysqld equals unnecessary configuration of extension testOriginal link: https://m.aliyun.com/bbs/read/300762.html MySQL is a powerful open-source database. With more and more database-driven applications, people have been pushing MySQL to its limits. Here are 101 tips for adjusting and optimizing MySQL installation. Some of the techniques are specific to the installation environment, but these ideas are generic. I've divid

Label: MySQL is a powerful open-source database. With more and more database-driven applications, people have been pushing MySQL to its limits. Here are 101 tips for adjusting and optimizing MySQL installation. Some of the techniques are specific to the installation environment, but these ideas are generic. I've divided them into several categories to help you master more of the tuning and optimization tech

visual GC plugin is installed, open the app from the left sidebar and move the view to the Visual GC section. You will get details about JVM memory and garbage collection as shown in. Java garbage Collection tuning Java garbage Collection tuning should be the last option to increase application throughput.

MySQL is a powerful open-source database. With more and more database-driven applications, people have been pushing MySQL to its limits. Here are 101 tips for adjusting and optimizing MySQL installation. Some of the techniques are specific to the installation environment, but these ideas are generic. I've divided them into several categories to help you master more of the tuning and optimization techniques

the article you learn SQL language experience, or probation book feel, we will elect 3 readers to give "SQL optimization core ideas" 1, quickly actively participate in it! Event deadline: May 10, 2018 In the "async Community " Backstage reply " concern ", you can get free 2000 online video courses ; recommend friends follow the tips to get books link, free to get an asynchronous book. Come and join me!Sweep the QR code above, reply to the "Att

the memory pool, the allocation and usage of overall memory, and the number and time of garbage collection by different GC. You can manually perform GC view memory changes.It is useful to analyze Java memory issues for tuning, you learn the JVM memory model, and then you find that each value here has meaning.GC Algorithms and parameters have a significant impact on per