spt tuning

class. A VM profile that shows a summary of all information about the JVM, including basic information, thread-related, heap-related, operating system, VM parameters, and so on. Mbean, view the properties, methods, etc. of the mbean. VisualVMBrief introductionVisualVM is a tool that provides a visual interface for viewing detailed information about Java-based applications (Java applications) running on Java virtual machines (Java machine, JVM). VisualVM organizes the data about the

full GC takes much longer than the GC usage time for younger generations. GCT: This column shows the total cumulative time of the GC operation. Note: The total cumulative time is the sum of the time used by the YGCT and fgct two columns (GCT=YGCT+FGCT). Jstat , we can also run Jstat on a remote server without a GUI. Note: We are using the-XMN10M option to specify the sum of s0c, S1C, and EC as 10m.Java VISUALVM and Visual GC pluginsIf you want to see the memory and GC in the GUI, you c

Guide Performance tuning has always been one of the most important work of operations engineers, if you are in a production environment encountered a slow system response, hard disk IO throughput anomalies, data processing speed is lower than expected, or such as CPU, memory, hard disk, network and other system resources have been exhausted for a long time, Then this article will really help you, if not, please collect them first. 1,hd

change the concurrency count to 200. found that about 50% of the return to 502. Then I will keystone-api instead of Keystone own service Openstack-keystone. Again with 200 concurrent pressure test: The discovery processing is normal, did not return 502. Ab-r-N 100000-c 200-h "user-agent:python-keystoneclient"-H "accept:application/json"-H "x-auth-token:65e194" htt p://keystonehost:35357/v2.0/ Probably know that the problem should be on nginx and UWSGI, limiti

As the web becomes more and more demanding on the performance of the system, the key to any system is how to ensure the performance of the system and can predict and locate the problem before performance problems occur. The system test before the system is on line and the performance monitoring of the whole system is the method to ensure the system to run with excellent performance. At the end of last year, I wrote an article about how to use Jprobe to discover and locate the performance bottlen

Js|servlet| Performance Overview In this article, Rahul Chaudhary describes the use of the Performance tuning technology (PTT performance-tuning techniques) to enhance the performance of servlets and JSP to improve the performance of your Java EE application. The author assumes that the reader has basic servlets and jsps knowledge. Is your Java application running slowly? Can they meet enough pressure? Th

Some small aspects of database Performance tuning:1. 1 Performance IndexDatabase performance is generally measured in two metrics: response time and throughput. The faster the response, the greater the throughput and the better the database performance. Response time and throughput cannot be improved together in some cases. 1. 2 Tuning LevelTuning the Sybase database performance can be done in four ways:Ope

Tags: autotask sql_tuningProduction on a set of 11g database Alert.log error ora-16957:sql Analyze time limit interrupt.Querying MOS-related documents troubleshooting:ora-16957: "SQL Analyze time limit Interrupt" Errors (document ID 1275248.1)The ORA-16957 error is a internal error code used to indicate that SQL Tuning Task have reached the time limit for Tuning A specific SQL.The default time limit is 3600

. Reference documents Microsoft Books Online logical operators and physical operator references Refer to the book SQL. server.2005. Technical Insider "series Conclusion This article is here first, this article mainly describes the T-SQL statement tuning from the execution plan, and introduces three common connection operators and aggregation operators, the next one will focus on some of our other most commonly used operators and

Original link: MySQL Memory Allocation-by Rick JamesOriginal date: Created 2010; Refreshed Oct,, Jan, 2014Translators: AnchorTranslation Date: May 28, 2014MySQL memory allocation-high-speed setup schemeAssuming that only the MyISAM storage engine is used, setkey_buffer_size20% of available memory (plus set innodb_buffer_pool_size = 0)Assuming that only the InnoDB storage engine is used, setinnodb_buffer_pool_sizeIs 70% of the available memory (set key_buffer_size = 10M, very small but not 0.)pra

garbage collection process are explained. The five articles will explain the principles of Java Program Performance tuning, especially the necessary knowledge in this process and the need to determine whether your program needs tuning. It also describes the problems you may encounter during tuning. At the end of this article, I'll give you some advice on how to

Tags: Delete existing image direct Analysis window adjustment based on aggregationSQL Server provides a tool called Database Engine Tuning Advisor. This tool helps to confirm an optimal set of indexes for a given workload without requiring an in-depth understanding of the database structure or the internal structure of SQL Server. It can also suggest tuning options for a small subset of problematic queries.

Label:SQL Server provides a tool called Database Engine Tuning Advisor. This tool helps to confirm an optimal set of indexes for a given workload without requiring an in-depth understanding of the database structure or the internal structure of SQL Server. It can also suggest tuning options for a small subset of problematic queries. Besides the benefits the tool also has disadvantages. should be used correc

The JDK itself provides many convenient JVM performance tuning monitoring tools, in addition to the integrated VISUALVM and Jconsole, there are JPS, Jstack, Jmap, Jhat, Jstat and other small tools, this blog hope to play a useful, Let's start to understand the common tools for tuning JVM performance.In real-world enterprise Java development, sometimes we encounter these problems: OutOfMemoryError,

"Product-level performance tuning and fault diagnosis analysis"Cover big pictureAbout the authorMr. Zheng, 2006~2009 three session of "Microsoft's most valuable expert", won the "Devwow Microsoft blog Tatsu" winner, won the Microsoft "most influential developer" award, through the Microsoft "MCSA/MCSE" certification, the company performance optimization experts, CSDN blog experts, with " Discovering: Vertically cut into ASP. NET 3.5 Control and compon

"Product-level performance tuning and fault diagnosis analysis"Cover big pictureAbout the authorMr. Zheng, 2006~2009 three session of "Microsoft's most valuable expert", won the "Devwow Microsoft blog Tatsu" winner, won the Microsoft "most influential developer" award, through the Microsoft "MCSA/MCSE" certification, the company performance optimization experts, CSDN blog experts, with " Discovering: Vertically cut into ASP. NET 3.5 Control and compon

This is an online database http://www.dbonline.cn. Oracle expert tuning secret Preface　　 In the past decade, Oracle has become one of the world's most professional databases. For IT experts, it is to ensure that their company's productivity is improved by leveraging the powerful features of oracle. One of the most effective methods is to use ORACLE optimization. It has a lot of parameters and technologies to improve the performance of your Oracle

According to the tradition, parameters and settings of different Linux distributions and kernels have been changed, so that the system can achieve better performance. The following section describes how to use the following techniques to optimize performance in Red Hat Enterprise Linux AS and suse linux Enterprise Server systems: QUOTE: 1. Disabling daemons (disable daemons) 2. Shutting down the GUI (Disable GUI) 3. Changing kernel parameters (Change kernel parameters) 4. Kernel parameters (Kern

must be written to disk because the exchange may cause some failures. Therefore, we can exchange the data in the Exchange memory, must be no modified data, modified, to free up, you can only write to the hard disk.With the basic knowledge of memory concepts, here are some common tuning options for memory:I. Tuning parameters related to HugepageCat/proc/zoneinfo can view the segmentation of memory segments

PrefaceThis article continues to explain how to tune the concepts that are relevant to performance optimization in the previous chapter. Code optimization is the most common of us, but there are also software architectures, JVM virtual machine tiers, databases, and operating system levels that can be tuned in various ways to improve performance. The ChaseGeneral steps for optimization:If there is a problem with our system, then the most important thing is to find and solve the performance bottle