java performance tuning interview questions

Want to keep your project running at high performance? Here are some tips you can take to eliminate cache bottlenecks, as well as some other performance tuning recommendations.Most developers think that performance optimization is a complex topic that requires a lot of work experience and relevant knowledge theory. Wel

. GC Tuning target has three basic ideas: Reduce GC frequency, can increase the heap space, reduce unnecessary object generation, reduce GC pause time, can be achieved by reducing heap space, using the CMS GC algorithm, avoid full GC, adjust the CMS trigger scale, avoid Promotion Failur E and Concurrent mode failure (the older generation allocates more space, increases the number of GC threads to recover faster), reduces large object generation, and s

below: The total number of instances created on the left, the structure of the instance on the right, and the reference description below, which can be seen in the class Cyclicdependencies and referenced by HashMap.This can determine the location of the leak, and then according to the actual situation to analyze and solve. JVISUALVM remotely monitor Tomcat 1 and modify the remote Tomcat's catalina.sh profile, where it adds: java_opts="$JAVA

Java's current heat has declined, but there are still a lot of people who learn java. Java's post is also a lot of infiltration. So, those classic Java knowledge points, you can see the problem can say 123? Come and have a look.The difference between 1.JDK and JRE What is the difference between 2.final, finally, and finalize?3. The difference between threads and processesHow does the HashMap in 4.

1 , what are the aspects of object-oriented features ?　　The object-oriented programming language has 4 main features: encapsulation, inheritance, abstraction, polymorphism, etc.Details:http://www.cnblogs.com/guweiwei/p/6599289.html2 , access modifiers public,private,protected, and what is the difference between not writing (the default)? 　　Defaults to default when members of a class do not write access adornments. The default is equivalent to exposing (public) to other classes in the same packag

: The above can solve the POST request garbled problem. There are two garbled methods for GET request Chinese parameter:Modify the Tomcat profile add code to match the project code as follows: Another way to re-encode parameters: StringuserName =newString (Request.getparamter ("UserName"). GetBytes ("Iso8859-1"), "Utf-8") Iso8859-1 is the tomcat default encoding, and the Tomcat encoded content needs to be encoded by utf-8What is

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

First, the performance of the program through which several aspects of performance1. Execution speed (whether the reaction time of the program is rapid or short enough)2, allocate memory (allocate memory is reasonable, whether excessive memory consumption or memory overflow)3. Start-up time (how long it takes for the program from running to normal to process the business)4, load withstand capacity (when the system pressure rises, the system's executio

), versioning (git or SVN), big Data (odd heat), artificial intelligence (tall), etc.Someone asked, why does the architect still write code? I think, need to write as always, but the goal is not the same, the theoretical level and practical ability need to improve at the same time. Depth, attention to design ideas and patterns, breadth, for the forefront of technology, to pursue and research, so as to the future technical framework selection to make a reasonable decision.Java from getting starte

(throughput) collector? The throughput collector uses a parallel version of the new generation garbage collector, which is used for medium-sized and large-scale data applications. The serial collector is sufficient for most small applications, which require about 100M of memory on modern processors. 41. In Java, when can objects be garbage collected? This object can be recycled when the object becomes inaccessible to applications that currently use t

Java Interview Questions Library recommendation Directory (?) [-] 324 Java interview questions for IT Enterprises Introduction 324 Java