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Need to monitor Linux server performance? Try these built-in command and a few add-on tools. Most Linux distributions are equipped with tons of monitoring. These tools provide metrics which can be used to get information about system activities. You can use these tools to find the possible causes of a performance problem. The commands discussed below are some of the most basic commands when it comes to system analysis and debugging server issues such as: Finding out bottlenecks. Disk (storage) bottlenecks. CPU and memory bottlenecks. Network bottlenecks. #1: top - Process Activity Command The top program provides a dynamic real-time view of a running system i.e. actual process activity. By default, it displays the most CPU-intensive tasks running on the server and updates the list every five seconds. Fig.01: Linux top command Commonly Used Hot Keys The top command provides several useful hot keys: Hot Key Usage t Displays summary i...

This article describes how to do concurrent programming with Java. It covers the concepts of parallel programming, immutability, threads, the executor framework (thread pools), futures, callables and the fork-join framework. Table of Contents 1. Concurrency 1.1. What is concurrency? 1.2. Process vs. threads 2. Improvements and issues with concurrency 2.1. Limits of concurrency gains 2.2. Concurrency issues 3. Concurrency in Java 3.1. Processes and Threads 3.2. Locks and thread synchronization 3.3. Volatile 4. The Java memory model 4.1. Overview 4.2. Atomic operation 4.3. Memory updates in synchronized code 5. Immutability and Defensive Copies 5.1. Immutability 5.2. Defensive Copies 6. Threads in Java 7. Threads pools with the Executor Framework 8. Futures and Callables 9. Nonblocking algorithms 10. Fork-Join in Java 7 11. Deadlock 1. Concurrency 1.1. What is concurrency? Concurrency is the abi...