& & 艺术字做到后期，性能成了一个比较大的瓶颈，优化性能的过程中接触了一些.NET性能调试工具，最喜欢的是ANTS Performance Profiler，操作简单，功能也跟我期望的差不多。
& &&ANTS Performance Profiler是出自大名鼎鼎的Red Gate，很多人使用过的.NET Reflector就是出自此公司，该公司还出品其他产品，具体请戳http://www./products/。ANTS Performance Profiler支持.NET平台所有语言编写的应用程序，能支持.NET1.1到.NET4.6（当前最高版本）。
& &&ANTS Performance Profiler操作及其简单。
& & 启动界面
& & 选择New Profiling session 开启新的会话
& & 在新会话界面可以选择要监控的.NET程序，可以看到支持exe，Win App，Silverlight，IIS等，这里以常用的exe为例。
Path to .NET executable：选择你要监控的exe路径，点开Show startup options 可以配置命令行参数。
Profiling mode：选择你的监控信息的详细级别，默认是最详细的级别，可以监控所有方法包括framework内部的方法。
Chart performance counters:选择你需要收集的性能相关信息，例如CPU，线程数，IO，内存，甚至.NET垃圾回收各代的信息。
Additional profiler options:根据需求进行额外的配置。
配置也是超级简单的，配置完毕即可点击Start profiling，开始监控。
& & 此时操作你的程序，可以看到性能占用的变化，选择任意一段，下方即可看到该段时间各个方法的性能占用信息，这些信息包括耗时比例，触发次数等。在工具栏可以配置显示模式，可以以堆栈模式查看函数的性能占用信息，也可以在View里面选择其他统计方式，百分比或是毫秒等。选中方法后可以在最下方看到方法的代码，代码的左边即是相应代码行的性能占用信息，非常之方便。也可以选择以图表的形式查看一个方法中其子方法的性能占用情况，点击方法名后面那个小图标即可。
阅读(...) 评论()请问有没有工具可以检测java工程中有哪些文件流没关闭？
大家好，最近把工程部署到linux服务器上，启动tomcat时，报如下错误：
严重: Socket accept failed
java.net.SocketException: Too many open files
at java.net.PlainSocketImpl.socketAccept(Native Method)
at java.net.PlainSocketImpl.accept(PlainSocketImpl.java:408)
at java.net.ServerSocket.implAccept(ServerSocket.java:462)
at java.net.ServerSocket.accept(ServerSocket.java:430)
at org.apache.tomcat.util.net.DefaultServerSocketFactory.acceptSocket(DefaultServerSocketFactory.java:61)
at org.apache.tomcat.util.net.JIoEndpoint$Acceptor.run(JIoEndpoint.java:352)
at java.lang.Thread.run(Thread.java:662)
11:02:54 org.apache.tomcat.util.net.JIoEndpoint$Acceptor run
搜索了下，一般的解决办法是，加大Linux打开文件数，但我们系统肯定不会打开这么多文件，
所以想知道，有没有这样的工具：可以监控工程中哪些文件流没关闭。 谢谢。
我的项目也遇到这个问题
你可以lsof看下系统打开的文件
--- 共有 6 条评论 ---
: 我觉得这个问题就得一个一个排查，首先你可以线排查下findbugs扫描代码这个东西对文件的操作，然后再排除其他，我的项目中也是finally close了的，最后还是会产生文件打开的问题，所以我严重怀疑是我使用的搜索引擎框架底层代码有流的操作而产生的。
: 就算流重新开启，应该也是对方法的另外一次调用啊？
我觉得close放在finally里面，应该是没问题的。ps,谢谢你的回复。
: 是不是你在使用findbugs扫描代码的时候流又重新开启？上传下载应该流的操作只要有点经验就不会finally {xxx.close}
: 我们工程里面和文件处理相关的很少，基本就上传几个excel，和下载excel，用findbugs扫描代码，也没找大未关闭流的地方。
: 监控流，我貌似没有接触过，不过方便说你们是什么原因导致打开的文件多吗 ？我的是做搜索引擎打开的索引文件
最快的还是改linux的limit吧
--- 共有 1 条评论 ---
对，改打开文件数限制，就可以了。但是，我还是想找到没关闭流的地方。
ls -l /proc/###pid###/fd
我也遇到了这样的情况，最开始也是
改limit参数。这只是一个临时的解决方案，最根本的还是看你程序的哪些流没有关闭！好像没有类似的查看流没有关闭的工具。
没有看到过类似的工具，一般打开文件都是由一个类专门完成的，这样的话，只需要看好它就行了。
--- 共有 1 条评论 ---
一般都会关的，我的意思是，如果想检查整个代码的流是否有关，是否有这样的工具。
你如果对正则熟悉的话，可以写一个正则来检查类似于 fopen 和 fclose的配对
可以尝试使用jvisualvm（前提是进程没有宕）查看Socketimpl-》PlainSocketImpl-》SocksSocketImpl的实例来观察什么socket开了过多。&&&&&&&&&&&&&&&&&&
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- The Cougaar memory profiler is a tool for debugging memory usage and leaks in any Java application. It features a scalable 100% Java design that is lighter weight than existing JVMPI-based profilers. The profiler tracks memory usage within the application by using tables of WeakReferences.
- JMemProf is a live Java memory profiler suitable for deployment in web containers such as JBoss, Tomcat and others. JMemProf allows you to retrieve memory profile information while your application is running. JMemProf aims to add dynamic visibility to memory usage in J memory profile information can be viewed easily through a Servlet based web interface while the application is running. It is much more dynamic and easily understandable than that of the hprof heap profiler bundled with the J2SDK.
- JMP is a profiler for java that can be used to trace objects usage and method timings. JMP uses the JVMPI interface to gather statistics and interact with the JVM. JMP uses a GTK+ interface to show the status.
- Extensible Java Profiler (EJP) is a profiling tool for Java with a scalable and extensible architecture, allowing its usage for exotic programming languages that use a Java backend. EJP is based on the Java Virtual Machine Profiler Interface (JVMPI). It can be used to trace the execution of small parts of Java programs and display it in hierarchical trees with some elements hidden or highlighted.
- The Java Application Monitor (JAMon) is a free, simple, high performance, thread safe, Java API that allows developers to easily monitor production applications. JAMon can be used to determine application performance bottlenecks, user/application interactions, and application scalability. JAMon gathers summary statistics such as hits, execution times (total, average, minimum, maximum, standard deviation), and simultaneous application requests. JAMon statistics are displayed in the sortable JAMon report.
- jMechanic is an Eclipse Java IDE plugin providing Java Profiling tools. Tools such as CPU Sampling and Heap Summary allow the Java developer to tune up the performance of their Java programs all within the comfort of the Eclipse IDE.
- JRat is the Java Runtime Analysis Toolkit. Its purpose is to enable developers to better understand the runtime behavior of their Java programs. There are currently a number of ways JRat can monitor an application (i.e. Bytecode instrumentation, JBoss AOP, Dynamic Proxies, JDI).
- This is a plugin for the Eclipse platform which allows java code profiling.
- xdProf is a cross-platform tool that captures and analyzes stack traces sent at a fixed interval from Java Virtual Machines in a distributed system. The performance impact of the xdProf client sending data over a local area network is minimal: less than a 8% increase in total elapsed time for a set of standard benchmarks.
- Hyades is an integrated test, trace and monitoring environment, based on Eclipse, that provides standards, tools and tool interoperability across the test process.
- The Garbage Collector Spy Tool, or GCspy for short, is a generic and highly-adaptable heap visualisation framework, designed to visualise a wide range of memory management systems, whether they depend on garbage collection or implement explicit de-allocation.
- A zero-overhead JVMPI plugin for finding first indications of memory leaks in production environments. Where commercial tools kill the performance of your application by collecting uninteresting performance data (such as 'who allocated this object'), this plugin stays inactive during runtime and simply dumps a very simple image of the Java heap on request.
- The AdaptJ Agent allows to collect event trace data from a Java program running in a Java Virtual Machine. The AdaptJ Analysis Tool allows to read and analyze the traces generated by the agent, using either the built-in analyses or custom ones.
- JVMPI based visualization using a TreeMap.
- beSee 2 provides a mechanism to plug a class preprocessor instrumentation layer in any classloader hierarchy, thus supporting java 1.3, 1.4, J2SE and J2EE environment. beSee 2 is the ground 0 lightweight layer of the next generation AOP architecture. It provides a bytecode kit independant solution and comes ready to use with two implementation: BCEL and Javassist.
- The debugger works by collecting "time stamps" which record everything that happens in a program. A GUI then allows you to navigate backwards in time to look at objects, variables, method calls, etc. Although focused on debugging, technique may be applicable for Profilers.
- This is a GUI client tool that provides access to the HotSwap functionality. Using this tool, you can dramatically improve the time of the usual "test - find a bug - stop the program - change - recompile - restart the program" development cycle by removing the "stop" and "restart" elements from it. Furthermore, you can use it to patch "on-the-fly" deployed applications that need to run uninterrupted.
- Extsnible Program Trace Encoding. STEP providins a standard method for encoding general program trace data in a flexible and compact format. The system consists of a trace data definition language along with a compiler for the language and an encoding architecture that implements a number of common trace reduction techniques. The system simplifies the development and interoperability of trace clients by encapsulating the encoding process and presenting the data as an abstract object stream.
- AppStats is a lightweight, open source framework developed and used by Grand Central Communications, Inc. to capture, analyze, and publicize health, performance, and monitoring statistics for Java applications.
- P6Spy is an open source framework for applications that intercept and optionally modify database statements. P6Log intercepts and logs the database statements of any application that uses JDBC. P6Outage detects long-running statements that may be indicative of a database outage proble and will log any statement that surpasses the configurable time boundary during its execution. P6Outage was designed to minimize any logging performance penalty by logging only long running statements.
- NetBeans Profiler is a project to integrate the JFluid profiling technoglogy, which is being developed by Sun, into the NetBeans IDE. The JFluid technology addresses this issue by providing a mechanism in the JVM(tm), which allows the user to turn profiling on and off at any time, and, equally important, to profile just a small subset of the code, that they are currently interested in. The profiled subset of the code and the type of profiling (CPU, memory, etc.) can be changed at any moment at run time. This is achieved mainly through dynamic bytecode instrumentation. Features include low overhead profiling, attaching to running applications, CPU Performance profiling, memory profiling, memory leak debugging and task-based profiling.
- FProfiler is a Java Profiler using BCEL and log4j. Its very fast because it inserts the needed instructions into the Bytecode of the classes. It can be used to find Hotspots in Java programs, libs and servlet environments simply every Java class.
- The Heap Analysis Tool (HAT) helps to debug unnecessary object retention (sometimes called "memory leaks") by providing a convenient means to browse the object topology in a heap snapshot, which is generated by the Java VM. HAT reads a hprof file, then sets itself up as a web server--therefore allowing you to run queries against a heap dump contained within the hprof file.
- InfraRED is a tool for monitoring performance of a J2EE application and diagnosing performance problems. It collects metrics about various aspects of an application’s performance and makes it available for quantitative analysis of the application. InfraRED uses AOP to weave the performance monitoring code into the application.
- The Glassbox Inspector project combines AspectJ and JMX for a flexible, modular approach to monitoring performance for enterprise systems. It provides correlated information to allow you to identify specific problems, but with low enough overhead to be used in production environments. It lets you capture statistics such as total counts, total time, and worst-case performance for requests, and will also let let you drill down into that information for database calls within a request.
- JIP is a code profiling tool much like the hprof tool that ships with the JDK. JIP allows you to turn the profiler on and off while the JVM is running. JIP is pure Java. It takes advantage of the Java5™ feature which allows you to hook the classloader. When the profiler is turned off, there is almost no overhead associated with using JIP. JIP allows real world timings for every class in your code.
- DJProf is an experimental Java profiling tool which employs AspectJ to insert the necessary instrumentation for profiling rather than, for example, the Java Machine Profiler Interface (JVMPI). DJProf can be used to profile Java programs without modification (i.e. there is no need to recompile them for profiling) and does not require the user to have any knowledge of AspectJ. The Load-Time Weaving capability of AspectJ is utilised to make this possible. It supports several different modes of profiling such as heap usage, object lifetime, wasted time and time spent.
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