VisualVM

I've created a simple 1 file java application that iterates through a loop, calls some functions, allocates some memory, adds some numbers, etc. I run that application via eclipse's Run As->Java Application . The running application shows up in Java VisualVM under Local . I double click on that application and go to the Profiler tab. The default settings are: Start profiling from classes: my.main.package.** Do not profile classes: java.*, javax.*, sun.*, sunw.*, com.sun.* I click on CPU . The CPU and Memory buttons gray out. Nothing happens. The Status says profiling inactive . When my

The problem is: VisualVM sampler shows call tree by time. For some method sampler shows only "Self time" so I can't see what makes this method slow. Here is an example . How can I increase the depth of profiling? Unfortunately sampling profilers are rather limited when it comes down to in-depth profiling due to a number of reasons: Samplers are limited by the sampling period: For example, VisualVM currently has a minimum sampling period of 20ms. Modern processors can execute several million instructions in that time - certainly more than enough to call several short methods and return from

问题描述：VisualVM连接远程服务器有两种方式：JMX和jstatd，两种方式都不能完美支持所有功能，例如JMX不支持VisualGC，jstatd不支持CPU监控，实际使用可同时配置上并按需选用。 下面介绍如何配置jstatd连接方式，实现使用visualgc插件查看远程服务器上java程序的gc情况： 1.修改远程服务器上java设置 vi $JAVA_HOME/jre/lib/security/java.policy 在文件末位的 }; 前添加 permission java.security.AllPermission; 2. cd $JAVA_HOME/bin ./jstatd -J-Djava.security.policy=jstatd.all.policy -J-Djava.rmi.server.hostname=192.168.2.85 -p 2030 3.本地 启动VisualVM，因为在配置JMX时已经添加过服务器节点，如果配置正确，通常VisualVM会自动检测到jstatd连接并添加节点 来源： oschina 链接： https://my.oschina.net/u/1458864/blog/2049724

1.在服务器上配置 jstatd 的 security policy 文件 进人服务器的 /usr/java/jdk1.6.0_26/bin目录中，在该目录下面建立一个新的文件 jstatd.all.policy 文件中的内容为： grant codebase "file:${java.home}/../lib/tools.jar" { permission java.security.AllPermission; }; 2.修改服务器 hosts 文件中的 IP 地址 要使 Java VisualVM 成功连接到远程服务器上，服务器端应该在 /etc/hosts 文件中把本机地址设为本机的 IP 地址。使用 hostname -i 命令查看，如果显示的是 127.0.0.1 或者与本机实际 IP 不一致的话，需要把 /etc/hosts 文件中相应的地址改为本机实际 IP 。 3.运行 jstatd 守护程序 在服务器的 /usr/java/jdk1.6.0_26/bin目录下，执行以下命令： screen jstatd -J-Djava.security.policy=jstatd.all.policy -J-Djava.rmi.server.logCalls=true 如果screen命令没有安装，请执行 #如果你使用APT软件包管理工具： apt-get install

VisualVM 远程连接服务器 VisualVM 提供在 Java 虚拟机 (Java Virutal Machine, JVM) 上运行的 Java 应用程序的详细信息。在 VisualVM 的图形用户界面中，您可以方便、快捷地查看多个 Java 应用程序的相关信息。 1.打开 jdk/bin 下的 jvisualvm.exe ，点击 工具->插件，把所有插件下载下来 2.要想监控远程服务器，需要在服务器上运行 jstatd 守护进程。下面以 CentOs 为例 jstatd 命令介绍 在 $JAVA_HOME/bin 下创建安全策略文件，命名为 jstatd.all.policy，内容如下： grant codebase "file:${java.home}/../lib/tools.jar" { permission java.security.AllPermission; }; 运行 jstatd -J-Djava.security.policy=jstatd.all.policy -J-Djava.rmi.server.hostname=xxx.xx.xx.xx （hostname 为你的 IP） 如果报错： > jstatd -J-Djava.security.policy=jstatd.all.policy -J-Djava.rmi.server.hostname

In Java profiling, it seems like all (free) roads nowadays lead to the VisualVM profiler included with JDK6. It looks like a fine program, and everyone touts how you can "attach it to a running process" as a major feature. The problem is, that seems to be the only way to use it on a local process. I want to be able to start my program in the profiler, and track its entire execution . I have tried using the -Xrunjdwp option described in how to profile application startup with visualvm , but between the two transport methods (shared memory and server), neither is useful for me. VisualVM doesn't