instrumentation

My works relates to instrumentation of code fragments in python code. So in my work i would be writing a script in python such that I take another python file as input and insert any necessary code in the required place with my script. The following code is a sample code of a file which i would be instrumenting: A.py #normal un-instrumented code statements .... .... def move(self,a): statements ...... print "My function is defined" ...... statements ...... My script what actually does is to check each lines in the A.py and if there is a "def" then a code fragment is instrumented on top of the

Instrumentation JDK中对它介绍如下：这个类为JVM上运行时的程序提供测量手段。很多工具通过Instrumenation 修改方法字节码 实现收集数据目的。这些通过Instrumentaion搜集数据的工具不会改变程序的状态和行为。这些良好的工具包括 monitoring agents , ,profilers, coverage analyzers, 和 event loggers。 有两种方式来获取Instrumentation接口实例： 启动JVM时指定agent类。这种方式，Instrumentation的实例通过agent class的premain方法被传入。 JVM提供一种当JVM启动完成后开启agent机制。这种情况下，Instrumention实例通过agent代码中的的agentmain传入。 java agent 在JDK package specification中解释：一个agent 是被作为Jar 文件形式来部署的。在Jar文件中manifest中指定哪个类作为agent类。具体的实现包括 通过命令行直接指定选项开启agent,也支持JVM启动程序后，通过工具attach到该程序上。 下面通过例子来说明javaagent + Instrumentation的用法。 通过在程序启动前 preagent方式 ：

In order to use the instrumentation features introduced in JDK 5, you can use the -javaagent flag passed to the JVM. This will inject an instance of an Instrumentation class into the static premain method. For example in a class like this: public class MyClass { public static Instrumentation inst; public static void premain(String options, Instrumentation inst) { MyClass.inst = inst; } } With an appropriate manifest file, you can run this as follows: java -javaagent:myfiles.jar SomeClass This calls the premain method then main from SomeClass . This approach is used in the Java.SizeOf Project

For example, there is the source: void my_special_debugging_function(const char* function_name, const char* file_name, int line_number); void func1() { func3(); func4(); } void foo() { func1(); if(qqq) { func2(); }; func3(); func4(); for(...) { func5(); } } It should compile as: void my_special_debugging_function(const char* function_name, const char* file_name, int line_number); void func1() { my_special_debugging_function("func1", "prog.c", 3); func3(); my_special_debugging_function("func1", "prog.c", 4); func4(); my_special_debugging_function("func1", "prog.c", 5); } void foo() { my_special

I'm trying to figure out how to profile a WCF service so I can identify any bottlenecks. I have found a bit of information on line, but nothing that assumes no prior knowlege which is where I'm at. What are recomended FREE tools? - visual studio tools - clrprofiler Here is information I found using vsperfcmd.exe to profile wcf service and according to this it is very simple, but I need to fill in the gaps on where to start. My assumptions are to copy VsPerfCLREnv and VsPerfCmd to the server that hosts my wcf service and perform some configuraiton steps that I'm not quite sure on. I'm also not

新项目年后就上线了，现在业务上没什么问题，就用 TProfiler 做了下性能分析，果然有坑。 ##一、TProfiler入门 高手请自觉略过本节。 ###1.简介 TProfiler是阿里巴巴开源的一款性能分析工具。号称可以用于生产环境进行长期的性能分析。测试程序部署后，在低峰期对响应时间影响20%，在高峰期对QPS影响30%。详细介绍请见 官方WIKI 。 ###2.简要的实现原理 TProfiler的实现基于JAVA的 Instrumentation 和ASM。 Instrumentation可以理解为一种虚拟机级别的AOP实现 ，无需对项目代码和JDK有任何改动就可以实现AOP功能。TProfiler利用Instrumentation提供的入口，调用ASM将待分析的类的字节码进行修改，加入分析记录方法。在Profiler运行时即可抽样收集到相关类方法的调用信息。使用Instrumentation时也可以通过JVMTI提供的接口实现对类的完全控制。至于 为什么TProfiler会选择ASM ，我想可能有两方面的考虑： 1）性能上更高效。使用JVMTI在每个类装入时都要执行hook程序，而ASM没有明显的性能代价。 2）使用JVMTI对编程难度要求较高，要求对class文件结构和java字节码有深刻了解，而ASM虽然也有一些难度，但是相对来说还是小一些。 ###3.配置

If I have an arbitrary function myFunc , what I'm aiming to do is replace this function with a wrapped call that runs code before and after it executes, e.g. // note: psuedo-javascript var beforeExecute = function() { ... } var afterExecute = function() { ... } myFunc = wrap(myFunc, beforeExecute, afterExecute); However, I don't have an implementation of the required wrap function. Is there anything that already exists in jQuery like this (I've had a good look through the docs but cannot see anything)? Alternatively does anybody know of a good implementation of this because I suspect that