JProfiler

not able to open jmc for java version jdk1.8.0_191.jdk

由 邮差的信 提交于 2019-12-11 06:33:52
问题 I have a mac system. Whenever i try to open java JMC, it doesn't open. I can just see maximise, minimise and close buttons for the dialog box. The jdk version im using is jdk1.8.0_191.jdk. 回答1: This is unfortunately a bug that we recently discovered, caused by incompatibilities between old Eclipse/SWT versions and new fixes done in JDK 8u152 (backported from JDK 9) . Workaround is to run older version of JDK 8, or the latest version of JDK 7 (which includes the same version of JMC). JDK 9

Can JProfiler measure stack depth?

由 空扰寡人 提交于 2019-12-11 02:58:46
问题 This is closely related to another question: How can I measure thread stack depth? Can JProfiler watch threads and measure where the deepest stacks occur? If so, how can I do that? I'd like find spots in my application where I'm getting dangerously close to triggering a StackOverflowError. 回答1: JProfiler does not have this as a feature directly. However, you can do the following: Record CPU data with sampling and no filters go to the call tree view in the CPU section export the call tree in

Why does jProfiler show Unsafe.park/unpark as using CPU cycles?

由 谁说我不能喝 提交于 2019-12-10 14:58:56
问题 We're running a service using quite a lot of ExecutorServices. When profiling the service using jProfiler 7.1 (sampling, Runnable), we can see that sun.misc.Unsafe.park + unpark is currently the calls using most of the CPU time in the hotspot. http://i.stack.imgur.com/wT2Cj.jpg This is puzzling. Park and unpark should be blocking, hence not use any CPU cycles (or at least a low amount). Is this some sort of bug from the jprofiler (i.e. not detecting it, because it's in the sun.misc package?)

How to run Jprofiler from Windows machine to Remote Linux JVM

由 心已入冬 提交于 2019-12-10 13:32:01
问题 Kindly let me know how to run Jprofiler from Windows machine to Remote Linux JVM. Thanks a lot in advance. 回答1: 1) Go to the download page, download the .tar.gz distribution and extract it on the remote Linux machine. 2) On the remote Linux machine, start the command line utility bin/jpintegrate , then follow the steps in the command line wizard. 3) Transfer the generated JProfiler config file to your local Windows machine. 4) On your local Windows machine, start the JProfiler GUI and import

Linux安装使用jprofiler6分析服务器应用状态

由 核能气质少年 提交于 2019-12-10 02:43:36
　对于 Linux 操作系统 的初学者来说，安装使用jprofiler6分析 服务器 应用状态可不是一件简单的事情。别急，只要你读了接下来的这篇文章，安装jprofiler6便不会是一件困难的事情了。 　　1、当应用出现问题时可以用jprofiler进行分析cpu、内存、线程等状态，进而协助排查问题; 　　2、此处我使用jprofiler6.2.1进行分析 　　我从官方网站下载了最新版本的jprofiler。这里分为两个软件： 　　(1) windows安装的部分：jprofiler_windows_6_2_1.exe 　　(2) linux安装的部分：jprofiler_linux_6_2_1.tar.gz 　　因为这个是付费的，所以需要sn序列号。大家去获取一个6.0版本的序列号即可。windows和linux安装的文件版本号必须相同，否则无法连接; 　　3、先安装linux 　　(1) 安装tomcat到/usr/local/tomcat6下; 　　(2) 将jprofiler_linux_6_2_1.tar.gz解压缩成jprofiler6，并移动到/usr/local/jprofiler6目录下; 　　(3) 将tomcat6/bin目录下的startup.sh脚本拷贝到本地windows的某个目录中; 　　4、安装windows：运行jprofiler_windows

Jprofiler工具安装及使用

由 主宰稳场 提交于 2019-12-10 02:28:40
1、 下载相应版本 下载链接地址： http://www.ej-technologies.com/download/jprofiler/files.html 根据本身系统的类型下载相应的版本，这里主要以windows64位系统及linux系统上的版本为例。 2、 安装 1）、客户端安装：安装好工具，启动会要求注册 下面是注册码，任意选择一个: L-Larry_Lau@163.com#24777-1i8da63tvtyl2#1119 L-Larry_Lau@163.com#61624-1dvrt8wj18v1#6260 L-Larry_Lau@163.com#50028-se4zkrr1m6t1#10246 L-Larry_Lau@163.com#15600-189y158nwwvuk#339 L-Larry_Lau@163.com#30640-1lklqdbcjmhxs#4016 L-Larry_Lau@163.com#57474-53b2wr1311gnz#10228 L-Larry_Lau@163.com#19667-11r2awc10nqelb#4016 L-Larry_Lau@163.com#60353-pphob7wraf0y#515 L-Larry_Lau@163.com#65157-1ae6ytp7ygj8m#0012 L-Larry_Lau@163.com

Why is the Simple Least Recently Used Cache Mechanism used?

由 柔情痞子 提交于 2019-12-08 19:32:41
问题 I am using JProfiler to inspect a Java microservice while I simulate concurrent users with JMeter. With JProfiler I can see: Navigating to the method find(), I realized the method has synchronized keyword In my opinion this method causes the problem with blocked threads. But why is it used? May I disabled this cache mechanism from microservice? The microservice is written in Java and it uses Spring, Spring Boot. Thank you I added screenshot from the same JProfiler snapshot for Monitor History

How to use JProfiler over two-hop SSH tunnel

由 心已入冬 提交于 2019-12-08 02:41:28
问题 I'm trying to connect JProfiler to a JVM running on a server that I'll call remote . This server is only accessible from my workstation ( local ) via another server that I'll call middle . My plan for connecting JProfiler to remote was this: Install the JProfiler instrumentation on remote Establish SSH tunnel from local , through middle , to remote : ssh -v -N -L 8849:[remote's private address (192.168... etc)]:8849 [middle] Establish a new JProfiler session on localhost:8849 , choosing

Large HPROF file

由 百般思念 提交于 2019-12-07 13:17:19
问题 I have a very large Heap Dump (.hprof) file (16GB). When I try to open it in Visual Vm,the VM just hangs. I tried to open it in JProfiler. Jprofiler gave me a Out Of Memory error. Below is how my jprofiler.vmoptions looks like. What should be the ideal configuration, I should be using in order to open the HPROF without issues? I am running on a 8GB Linux box. -Xmx1536m -XX:MaxPermSize=128m -Xss2m 回答1: JProfiler 8.1 will be able to open much larger HPROF files without tuning the -Xmx VM

开发自动化系列-工具集(二)系统性能监控工具

由 ∥☆過路亽．° 提交于 2019-12-07 13:02:48
摘 要 孔子云：工欲善其事，必先利其器。作为开发人员，我们致力于为最终用户实现工作流程自动化；然而，许多开发人员却疏忽了将自己的开发流程自动化。企业级应用系统涉及到开发、测试、部署、实施等一系列开发流程，在整个软件开发过程中我们如何借助工具、方法和模式使过程简单自动化，减少一些低效繁琐的开发工作量。 本系列试图使用一系列的工具介绍帮助大家在日常工作中减轻繁杂低效的开发工作，借助于现有的一系列工具提升大家的开发效率，使大家日常工作做到事半功倍。 在 Java 程序的开发过程中，不可避免地会遇到内存使用、性能瓶颈等问题。 Java Profiler 工具能帮助开发人员快速、有效地定位这些问题，因此成为了 Java 开发过程中的一个重要工具 。 本文作为该系列的第二章，介绍Java EE应用的系统性能监控工具JProfiler，JProfiler 可以通过时时的监控系统的内存使用情况，随时监视垃圾回收，线程运行状况等手段，从而很好的监视 JVM 运行情况及其性能。 通过介绍这个工具的使用，帮助开发人员发现系统应用的性能瓶颈，提升系统运行性能。 一、 JProfiler 是什么？ JProfiler 是一个全功能的 Java 剖析工具（ profiler ），专用于分析 J2SE 和 J2EE 应用程序。它把 CPU 、执行绪和内存的剖析组合在一个强大的应用中。 JProfiler
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