![]() In addition to the Java EE subsystems like JDBC, JPA/Hibernate, JSP/Servlets, JMS, web services and JNDI, JProfiler also presents high level information about RMI calls, files, sockets and processes. JProfiler has a number of probes that show you higher level data from interesting subsystems in the JRE. With its JEE support, JProfiler bridges the gap between a code profiler and a high-level JEE monitoring tool. Also, JProfiler adds a semantic layer on top of the low-level profiling data, like JDBC, JPA/Hibernate, JMS and JNDI calls that are presented in the CPU profiling views. In addition, the call tree is split up for each request URI. For example, in the JEE aggregation level you see the call tree in terms of the JEE components in your application. From the JDBC timeline view that shows you all JDBC connections with their activities, through the hot spots view that shows you slow statements to various telemetry views and a list of single events, the database probes are an essential tool for getting insight into your database layer.ĮXCELLENT SUPPORT FOR JAVA ENTERPRISE EDITIONĭedicated support for JEE is present in most views in JProfiler. JProfiler's JDBC and JPA/Hibernate probes as well as the NoSQL probes for MongoDB, Cassandra and HBase show the reasons for slow database access and how slow statements are called by your code. On all levels, JProfiler has been carefully designed to help you get started with solving your problems.ĭATABASE PROFILING FOR JDBC, JPA AND NOSQLĭatabase calls are the top reasons for performance problems in business applications. ![]() Configuring sessions is straight-forward, third party integrations make getting started a breeze and profiling data is presented in a natural way. JProfiler is just that: simple and powerful at the same time. At the same time, you do not want to spend time learning how to use the tool. ![]() When you profile, you need the most powerful tool you can get. The two facets that tend to alternate in my attention therefore are memory and CPU efficiency, and JProfiler does a good job with each of those.JProfiler is a powerful tool that you can use to profile Java based applications in a dynamic way and enables you to analyze them in hopes of optimizing performance. ![]() The biggest/busiest of my mirrors are multi-core, multi-GB, multi-GHz affairs, and the exact same Java code runs on them, inflating itself to fit! Especially since I'm aiming to run on relatively low-powered systems (constrained memory and CPU speed) to keep down carbon footprint, even while running geographically-distributed instances to keep responsiveness good for users worldwide.īasically I aim to be able to run mirrors on server instances using a few Watts at most, such as the SheevaPlugĪnd maybe even a (B) Raspberry Pi, though the latter will require further tweaking! That focus of effort on where it will actually pay off is priceless.įor the Gallery, though it may look like it's all about photographs, it actually spends a great deal of its time handling and manipulating text, partly because it's an HTTP/Web based server, and partly because it holds the entire meta-data database in memory for speed, and therefore has to use efficient and complex representations for some parts. Is to build a sensible design that is not deliberately profligate or careless with resources, but do not attempt to optimise without finding that there is some performance problem and then use a tool such as JProfiler to know where it actually is, not where you think it might be. "Premature optimisation is the root of all evil" Something I keep reminding my clients, given Knuth's dictum: The beauty of tools such as JProfiler is the holistic view that they can provide of CPU, memory, threading and similar issues, often ones that you did not know that you had. With Java's reflection it is possible to build some simple programmatic profiling tools that examine what running threads are up to, and the Gallery automatically accumulates a simple profile of mirrors/nodes/servers that get unexpectedly busy for example, but that takes some effort and requires knowing fairly precisely what you're looking for. Support Earth Notes with Patreon and Ko-fi! Reflection
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