java performance tuning tips

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 performance, note the number of garbage collections, the time, and the partial GC and full GC, adjust the different GC and GC parameters you use, and then look

increase application throughput. Java garbage collection tuning should be considered when you find that your app has degraded its performance due to long garbage collection and time-outs.If you see Java.lang.OutOfMemoryError:PermGen space errors in the log, you can try using the-xx:permgen and-xx:maxpermgen JVM options to monitor and increase the perm gen memory

Tools as a graphical interface to show more intuitive discovery problems, on the other hand, some performance analysis (dump file analysis) will not be directly analyzed in production, often dump files up to about 1G, manual analysis of low efficiency, so the use of tools to analyze JVM-related issues, Long can reach a multiplier effect.JVM monitoring analysis tools are generally divided into two categories, one is the JDK comes with the tool, one is

Regardless of whether you are concerned, Java Web applications use a thread pool to handle requests more or less. The implementation details of the thread pool may be overlooked, but the use and tuning of the thread pool is something that needs to be understood sooner or later. This article mainly describes the use of the Java thread pool and how to properly conf

51CTO Learning notes--Linux operation troubleshooting ideas and system tuning tips video Lessons650) this.width=650; "src=" Https://s1.51cto.com/images/201611/25208e84076a9820fec7594656b44c32427a85.png "alt=" 25208E84076A9820FEC7594656B44C32427A85.P "/>First lesson Linux operation and maintenance experience sharing and thinking1, the general host name, write to the hosts under the 127.0.0.1 hostname, becaus

.-xx:survivorratio-XX:USERPARNEWGC can be used to set up parallel collections-xx:parallelgcthreads can be used to increase the degree of parallelism-XXUSEPARALLELGC You can use the parallel purge collector after setting-xx:useadaptivesizepolicy works better with the previous one, and it can automatically optimize the new domain size and save space ratios6.2. Client: Tuning the client JVM by setting parameters in the Jnlp fileJNLP parameters: Initial-h

Tuning of JVM MemoryThe default Java virtual machine size is relatively small, when the big data processing, Java will be error: Java.lang.OutOfMemoryError.1. Heap Settings and garbage collection Java heap are divided into 3 zones, young,old and permanent. Young saves the object that was just instantiated. When the are

Regardless of whether you are concerned, Java Web applications use a thread pool to handle requests more or less. The implementation details of the thread pool may be overlooked, but the use and tuning of the thread pool is something that needs to be understood sooner or later. This article mainly describes the use of the Java thread pool and how to properly conf

maximum comfort is provided. It's clear that this stakes are high and growing for Web applications.It's easy to improve efficiency, but it's hard to see the actual results. In order to help you on your quest, this article will provide you with 10 tips to improve your website's performance up to 10 times times. This is a series of first articles on improving application

OutOfMemoryError-xx:+heapdumponoutofmemoryerrorTake a look at the Java parameter configuration for a time: ( server: Linux 64bit,8corex16g)java_opts= "$JAVA _opts-SERVER-XMS3G-XMX3G-XSS256K-XX:PERMSIZE=128M-XX:MAXPERMSIZE=128M-XX:+USEPARALLELOLDGC -xx:+heapdumponoutofmemoryerror-xx:heapdumppath=/usr/aaa/dump-xx:+printgcdetails-xx:+printgctimestamps-xloggc :/usr/aaa/dump/heap_trace.txt-xx:newsize=1g-xx:maxn

that your app has degraded its performance due to long garbage collection and time-outs.If you see it in the log.Java.lang.OutOfMemoryError:PermGen space error, you can try using the-xx:permgen and-xx:maxpermgen JVM options to monitor and increase the perm gen memory space. You can also try to use-xx:+cmsclassunloadingenabled and view execution performance using the CMS garbage collector.If you see a lot o

Java program performance optimization and java Performance Optimization Java program tuning entry-level tutorials seem very thick. In fact, the book is very thin, domestic handwriting is high, of course there are some content sus

data to a CSV file, you can use other tools to analyze the data later.MemoryThis is valuable in terms of heap memory, non-heap memory, the state of 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, an

Regardless of whether you are concerned, Java Web applications use a thread pool to handle requests more or less. The implementation details of the thread pool may be overlooked, but the use and tuning of the thread pool is something that needs to be understood sooner or later. This article mainly describes the use of the Java thread pool and how to properly conf

Whether you care or not, Java Web applications use a thread pool more or less to process requests. The implementation details of the thread pool may be overlooked, but the use and tuning of the thread pool will need to be understood sooner or later. This article mainly describes the use of the Java thread pool and how to properly configure the thread pool. Singl

functions, remember that system functions can sometimes replace third-party libraries, and there are assembly-level optimizations that are often more efficient than code with JIT-compiled java. A typical example is the String.IndexOf () in the Android API, which is replaced by Dalvik for inline performance reasons. The same system.arraycopy () function is also replaced, so the

-processing of Heap Dump filesThe Heap Dump file can be obtained through the JVISUALVM user interface, which is also available through Jcmd and Jmap. The heap Dump file is a snapshot of the heap, typically using JVISUALVM and jhat to parse the snapshot.Back to top of pagePerformance analysis ToolsThe performance analyzers provided by Java are the most important analysis tools. It has a wide variety of stren

parallel. This method is called "one thread per request (thread per requests)." There are, of course, other ways to improve processing performance, such as the asynchronous event-driven model used by Nginx and node. js, but they do not use the thread pool and therefore are not covered in this article.In each request for a thread implementation, it is very expensive to create a thread (and subsequent destruction), because both the JVM and the operatin

Summary of Performance Optimization for 35 Java codes and java Performance Optimization Preface Code optimization is a very important topic. Some people may think it is useless. In some small places, what are the effects of modifying or not modifying the code on the code running efficiency? I think so. Is it useful t

Memory Overflow, is the program when requesting memory, there is not enough memory for its use "" ML memory leak, refers to the program after the application of memory, unable to free the requested memory space, resulting in this memory has been occupied" The final performance is basically the same, usually memory leaks ML will eventually cause an OOM error. In practical applications do not too tangled or draw a distinction, each phenomenon is relate