Concurrency in software development can enhance performance but also lead to deadlocks, which block threads from proceeding. This post discusses a real-world deadlock scenario caused by Java's "parallelStream" and how it was resolved using the troubleshooting tool yCrash. Switching from "parallelStream" to a regular stream eliminated the deadlock issue.
Thread dumps are essential for Android development, offering snapshots of running threads to diagnose performance issues and deadlocks. Utilizing commands like 'dumpsys thread' and 'jstack,' developers can capture dumps. Tools like 'fastThread' simplify analysis, highlighting performance bottlenecks and facilitating optimizations, ultimately enhancing application performance and user experience.
Sorting algorithms are crucial for organizing data, with parallel sorting addressing limitations of sequential sorting for large datasets. Java 8 introduced parallel sorting through the Streams API, enhancing efficiency using multithreading. Performance benchmarks demonstrate significant time savings with parallel sorting. Thread management is flexible via the ForkJoinPool API, improving scalability.
Laurentio Spilca, a Java and Spring expert, authored "Troubleshooting Java" to teach efficient code investigation, optimization, and bug fixing. The book includes techniques from basic debugging to advanced microservices methods. Notably, it demonstrates using the yCrash-fastThread tool for analyzing thread dumps, effectively diagnosing deadlock issues in Java applications.
ConFoo Montreal is a conference for developers, featuring global discussions on technology. Architect Ram Lakshmanan presented on the performance impacts of commonly used Java APIs. The session highlighted how these APIs can affect application performance, aiming to enhance developer awareness. Additional resources include a video link and shared slides.
This post explores the behavior of multiple synchronized methods in a Java object. It demonstrates through a program involving two threads that when one thread executes a synchronized method, the other thread is blocked from entering any synchronized method of the same object. Synchronization ensures orderly execution, preventing chaos.
Apache PDFBox is an open-source library for handling PDF documents in Java. A recent deadlock issue was identified in the library, which occurs when two threads are blocked, waiting for resources held by each other. The problem was diagnosed using a thread dump, and a ticket was filed, resulting in a prompt fix by the PDFBox team.
This post discusses deadlock in multi-threaded applications, specifically in Kotlin. It defines deadlock and provides a practical example using trains on a single track. A sample Kotlin program illustrates how deadlock occurs between two threads. Troubleshooting deadlock involves capturing thread dumps and analyzing them with tools like yCrash for clearer insight.
The World’s Largest 6th Annual All Day DevOps conference took place on October 28, 2021, featuring architect Ram Lakshmanan, who presented a webinar on the "7 habits of highly effective Performance Troubleshooters." The presentation covered forecasting problems, addressing incidents in real-time, root cause identification, and prevention strategies.