jd tuning

When it comes to MySQL tuning, there are a lot of points that we can do, so combing, some tuning strategy, today just summarizes the tuning of server parametersActually speaking, the parameter tuning, my understanding is nothing more than two points: If it is InnoDB database, innodb_buffer_pool_size to open as

The author of this book is a leader in Java performance and Java HotSpot virtual machines, helping you to use modern soft practices to improve your practical life by summarizing energy, avoiding common mistakes, and tips and tricks.Using G1 to overcome the limitations of parallel, serial, and CMS garbage collectors learn about the various stages of G1 GC collection, including the young generation and the old era fine tuning your application under G1 '

value is set to a larger value, the young generation object will replicate multiple times in the Survivor area, which can increase the lifetime of the object in the younger generation and increase the introduction of the recovery in the younger generation. -xx:permsize: Set a persistent band -xx:maxpermsize: Set the maximum value for persistent generation (2) Tuning JVM tuning is primarily for memory manag

data (mean file, etc), # and a subset of \ Images for the style recognition T Ask. ! data/ilsvrc12/get_ilsvrc_aux.sh !scripts/download_model_binary.py models/bvlc_reference_caffenet ! Python examples/finetune_flickr_style/assemble_data.py \ --workers=-1--images=2000--seed=1701--label=5 3. Compare the differences between the two models !diff Models/bvlc_reference_caffenet/train_val.prototxt Models/finetune_flickr_style/train_val.prototxt Output here omitted 4. Learn with Python, comp

Database performance depends to a large extent on whether there is an appropriate index on the table. But workloads and data change at any time, and existing indexes may not be entirely appropriate, and new indexes may be required. However, it is very difficult to determine the index, because it can be promoted to a query, but it will have a negative effect on other queries or other operations. SQL Server provides the Database Engine Advisor (DTA) tool to help validate a set of optimal indexes f

An outline that is roughly written in the optimization content of the physical design and logical design of the DB, mainly physical design, logical design introduction of the content is not much, the outline of the physical structure design and example optimization of organic combination of the logical structure design and application adjustment together ... Oracle Performance Tuning Guidance outline Design of database physical structure and adjustm

, next we will add some of the SQL Server parallel operations, Then analysis of our daily write additions and deletions to these operators to optimize the items, interested in advance attention, about the SQL Server performance tuning of the content is very broad, followed by the analysis in the article.If you have any questions, you can leave a message or private messages, and look forward to an in-depth study of your child's shoes with SQL Server. L

. server.2005. Technical Insider "series ConclusionThis article first to this bar, short, easy to understand, this article mainly introduces the query plan of the joint operators, the next we analyze SQL Server parallel operations, in multicore hyper-threading gathered today, see SQL How server uses parallel operations to maximize the use of existing hardware resources to improve performance, is interested in advance attention, the content of SQL Server performance

higher, faster disk.2.5.1. Network performance evaluation（1）通过ping命令检测网络的连通性（2）通过netstat –i组合检测网络接口状况（3）通过netstat –r组合检测系统的路由表信息（4）通过sar –n组合显示系统的网络运行状态Three Linux server performance Tuning 1. Tuning the Linux kernel elevator algorithm for disk I/OWhen the file system is selected, the algorithm balances low latency requirements, collects enough data, and effectively organizes requests for disk reads and wr

Websphere? Application Server Performance Tuning Toolkit is an Eclipse-based smart tool designed to help users tune WebSphere application by using data collection, data analysis, and statistical inference techniques The performance of the Server. The goal is to help users find bottlenecks and tune applications appropriately.Background knowledgeWith the wide deployment of Java EE-based enterprise-class multi-tiered architecture applications, more and m

strong support for the application performance diagnosis.Back to top of pagePerformance optimization PracticesAfter introducing some of the commonly used performance diagnostic tools, here are some examples from the JVM layer, the application code layer, and the database tier, combined with our practice in Java application tuning.JVM Tuning: GC PainSogou Commercial platform A system reconfiguration when the RMI is selected as the internal Remote call

Nginx Performance Tuning Address: http://nginx.com/blog/tuning-nginx/ Tuning NGINX for Performance Nginx Performance Tuning NGINX is well known as a high performance load balancer, cache and web server, powering over 40% of the busiest websites in the world. most of the default NGINX and Linux settings work well for mo

access URIsSeveral methods of restricting IP http://www.aminglinux.com/bbs/thread-6519-1-1.htmlNginx ConfigurationRestrict access to only one IP http://www.aminglinux.com/bbs/thread-450-1-1.htmlDisable access to the site via IP http://www.aminglinux.com/bbs/thread-38-1-1.htmlDisable an IP or IP segment to access the site's Setup method http://www.aminglinux.com/bbs/thread-546-1-1.htmlUsing User_agent to control client access http://www.aminglinux.com/bbs/thread-846-1-1.html7. Intrusion detectio

The SQL Tuning toolset (SQL Tuning set,sts) is an integral part of the Oracle 10g SQL Tuning Advisor feature. Each tuning toolset contains one or several SQL statements, as well as the contextual information needed to properly interpret them. SQL Tuning Advisor uses an adjus

　One, what is fine-tuning Fine-tuning is the long-term unchanged page, the local changes to the site, the text, pictures, layout and the position of the forum to adjust. 　Second, why to fine-tune For the long-term unchanged page, we need to adjust the page, thereby driving the website update, reduce 304 status code; User needs are constantly changing, improve conversion rate needs fine-

SEO optimization in the site, you have encountered the following problems, we have passed the period of the new station into the middle of the optimization, but no matter how we send out the chain, update the site snapshot of the article is like a snail motionless, when our optimization seems to enter the bottleneck period, A keyword when we do and we do in the middle of the time his customer search needs are different, if our content and layout has always been the original appearance then our s

SQL Auto-tuning is an Oracle-brought tuning tool that provides solutions.This time I mainly introduce the following automatic SQL tuning tools: Automatic SQL tuning (Automatic SQL tuning) SQL Tuning toolset (SQL

even untimely, it should be understood. has been in the Java community for nearly 3 years, for some performance tuning topic I have been stuck in the mouth, just for last night saw a performance tuning article, I can't help it .Tomcat Performance Tuning:Locate the Conf directory under the Tomcat root directory and modify the contents of the Server.xml file . For this part of the

. Orderid,o1. Freightfrom Orders o1where O1. Freight>( SELECT AVG. O2. Freight) from Orders O2)The goal of SQL execution is to query orders that have more than the average shipping charge in the order.The clause that extracts the average freight here is a completely independent subquery that executes independently of the main query. At the same time here we take advantage of a scalar computation (AVG) so that it returns exactly one row.Look at the query plan for the statement:This query plan

There are fewer tutorials on iOS performance tuning, and the decision to write an iOS performance Tuning series focuses on several aspects of memory leaks, performance optimization, traffic, and power analysis.Xcode has provided a very powerful performance tuning tool, combined with several third-party tools and some techniques, to optimize performance very simpl