jvm performance monitoring

: + useparnewgc: Set the young generation for parallel collection. It can be used together with CMS collection. Jdk5.0 or above, JVM will be set based on the system configuration, so you do not need to set this value. Java-xmx3550m-xms3550m-xmn2g-xss128k-XX: + useconcmarksweepgc-XX: cmsfullgcsbeforecompaction = 5-XX: + usecmscompactatfullcollection-XX: cmsfullgcsbeforecompaction: Because the concurrent collector does not compress and organize the

Mysql performance monitoring tool Innotop, mysql monitoring innotop Mysql monitoring management tool-innotop 1. innotop InstallationReference Official Website: http://innotop.googlecode.com/svn/html/installing.html # Wget http://innotop.googlecode.com/files/innotop-1.9.0.tar.gz# Tar-zxvf innotop-1.9.0.tar.gz# Cd innoto

other threads, or you can use an unfair (biased) policy, such as assigning a lock to the last thread that owns the lock.Assigning a lock again to the last thread that owns the lock is justified by the fact that, due to time continuity, the processor may also cache data related to the task performed by the thread, so that when the thread executes again, the time to prepare the context can be saved. Of course, using the bias lock itself requires a record of some relevant data, so at some point it

Java VisualVM--A powerful performance monitoring tool from the JDKHere is another way to observe the use and change of Java program memory through Jconsole.exe in the bin directory under the JDK.General remote debugging can be used, performance testing what.-dcom.sun.management.jmxremote-dcom.sun.management.jmxremote.port={port to access}- Dcom.sun.management.jmx

exception through the atop command view.Atop logEach time-point sampling page is combined to form a atop log file that we can use to view the log file using the "atop-r XXX" command. So what is the format for saving atop log files?For how to save the atop log file, we can do this: Save a atop log file every day, which records the information of the day Log files are named "ATOP_YYYYMMDD" Set the log expiration period, automatically delete the log file before a period of time

rate at which the service receives data bytes at the application level, excluding protocol headers and control bytesSent/secThe rate at which the service sends data bytes.Total/secThe total number of bytes per second transmitted by the Web Service (Bytes Sent/sec vs. Bytes Received/sec sum) Create a Trigger650) this.width=650; "src=" Http://s3.51cto.com/wyfs02/M02/72/E3/wKiom1Xvlj6wZuQcAAIOAm4Za2g554.jpg "title=" IIS triggers. png "alt=" wkiom1xvlj6wzuqcaaioam4za2g554.jpg "/> Zabbix

For system and network administrators, it is a heavy task to monitor and debug the performance of Linux systems on a daily basis. After 5 years working as an administrator in the IT field as a Linux system, I gradually realized how difficult it was to monitor and keep the system up and running. For this reason, we have written a list of the 18 most commonly used command-line tools that will help each Linux/unix system administrator work. These command

://publib.boulder.ibm.com/infocenter/javasdk/v5r0/index.jsp? Topic =/com.ibm.java.doc. diagnostics.50/diag/appendixes/env_var/env_jvm.html The default heapdumps is disabled, and you should remember to enable it during debugging. The default javadumps on out of memory and heapdumps on out of memory are both enabled, however, the default dump location is the directory where the profile is located. It is best to set ibm_heapdumpdir and ibm_javacoredir to another directory in the Java Process of the

Performance monitoring-SQL statement monitoring Analysis tableAnalyze table tablename compute statistics for all indexes;Analyze table tablename compute statistics for all indexed columns;Analyze table tablename compute statistics for table; Monitoring case waiting Select event, sum (decode (wait_time, 0, 0, 1) "Prev "

As you learned in part 1th of this series (three articles), monitoring the availability and performance of Java applications and dependencies in production is critical to ensuring problem detection and accelerating problem diagnosis and repair. Source-code-level inserts for classes that need to be monitored have the advantages that are discussed in part 1th, but this method is often not available or impract

Brief introduction As you learned in part 1th of this series (three articles), monitoring the availability and performance of Java applications and dependencies in production is critical to ensuring problem detection and accelerating problem diagnosis and repair. Source-code-level inserts for classes that need to be monitored have the advantages that are discussed in part 1th, but this method is often not

Label: Overview Conditions of Use Monitoring objects Ways to view real-time SQL monitoring results The following sub-packages for the Dbms_sqltune package Dynamic View Enterprise Managerem Related parameters Changes in each version Examples of real-time SQL monitoring

[Java Performance] JVM thread OptimizationAdjust the thread stack space When memory is very short, you can adjust the memory used by the thread. Each thread has a stack to record the call stack information of the thread. The default stack space in the thread is determined by the OS and JVM versions: OS 32-bit 64-bit Linux 320 KB

System Architect Java Virtual machine, OSGI-JVM Advanced Performance Architecture Project Combat developmentShare Network address: https://pan.baidu.com/s/1bproUYj Password: q6i3This course provides a comprehensive and systematic introduction to Java Virtual Machine Foundation, application, management, performance optimization, database architecture, environment

will struggle to free up space for the objects that are being moved in. But typically, generational garbage collection can give applications better performance. Another benefit of dividing up the new generation is to sort of solve the fragmentation problem, or postpone the worst. Small, short-lived objects could have been a problem of fragmentation, but were cleaned up in the new generation of garbage collection. The older age is also more compact b

First, JVM performance tuning strategySecond, performance tuning1. Java thread Pool (java.util.concurrent.ThreadPoolExecutor)The thread pool used by most applications on JVM6 is the thread pool that comes with the JDK, and the thread pool of mature Java threads is verbose because the thread pool behaves a bit like we imagined. The Java thread pool has several imp

% -xx:usecmscompactatfullcollection: Set up CMS to defragment once the garbage collection is complete -xx:cmsfullgcbeforecompaction: Set the number of CMS garbage collection after a memory compression. -xx:+cmsclassunloadingenabled: Allow collection of class meta data -xx:cmsinitiatingpermoccupancyfraction: When the permanent generation share reaches this percentage, start the CMS recycle (if-xx:+cmsclassunloadingenabled is activated) -xx:usecmsinitiatingoccupancyonly: It is only when the t

heapdump.-xms20m-xmx20m-xx:+heapdumponoutofmemoryerrorCommentary: Set the heap memory limit at 20m, Xms/xmx for the initial and maximum heap size of the heap, respectively.The resulting exception information:Mat for Memory analysisCommentary: From this side can be seen, this side gathered a lot of objects, occupy 99% of the amount of memory.　　2). Stack Overflow (stack)Stack overflow exception, or have a clear directivity. Temporary.　　3). Permanent generation Overflow (Chang/method area)Its erro

lightweight processes in the running queueUS: User-State CPU utilizationSY: System State CPU usageID:CPU Idle Rate2. Toptop-09:42:04 up 3 days, 3 min, 1 user, load average:0.00, 0.01, 0.05tasks:108 Total, 3 running, sleeping, 0 Stopped, 0 zombie%cpu (s): 0.0 us, 0.0 sy, 0.0 ni,100.0 ID, 0.0 wa, 0.0 hi, 0.0 si, 0.0 stkib mem:1015472 Total , 104568 free, 84224 used, 826680 Buff/cachekib swap:0 Total, 0 free, 0 used.

ObjectiveAfter getting started with the JVM garbage collection mechanism, you can then learn the performance tuning. There are two main parts of the content: The use of JDK tools. Tuning strategy. Weapon Spectrum JPSList the running virtual machine processes, using the following:JPS [-option] [HostID] Options function Q Output only Lvmid, om