A web application's memory optimization attempt revealed disappointing results. Despite using JVM arguments '-XX:+UseG1GC' and '-XX:+UseStringDeduplication', no reduction in memory usage was observed. The application's short-lived string objects led to negligible duplicate strings being eliminated, highlighting the need for code refactoring to prevent duplicate string creation and improve memory efficiency.
Enabling GC logging enhances application performance by reducing response time, aiding in memory issue troubleshooting, forecasting outages, and improving capacity planning without significant overhead. For Java 8 and below, specific JVM arguments enable logging, and for Java 9 and above, alternative commands are used. Analyzing GC logs requires tools like GCeasy due to varied formats.
Performance tests in enterprises often report macro metrics like CPU utilization and response times. However, these metrics can miss acute performance degradations and hinder troubleshooting. Incorporating micro metrics, such as Garbage Collection pause times and thread states, provides deeper insights and facilitates better performance management and debugging efforts for development teams.
Garbage Collection (GC) logs are vital for optimizing application performance and troubleshooting memory issues. Restarting an application can overwrite old GC logs, hindering analysis. Solutions include appending timestamps to log filenames or enabling GC log rotation. Each method has advantages and drawbacks, necessitating careful management to ensure all logs are accessible for future analysis.
Ram presented on Garbage Collection Logs at JavaOne, discussing insights and techniques that can enhance understanding of GC logs. The presentation aims to help developers effectively interpret these logs to optimize Java applications. Details can be found in the provided slideshare link.
Ram Lakshmanan presented on Garbage Collection logs at the JavaOne conference, sharing insights and analyses. The presentation aims to enhance understanding of garbage collection processes and optimization techniques. Additional resources, such as slides, are available for further reference and learning on the subject.
In Java 9, G1 GC will become the default garbage collector. One of the key features of G1 Garbage collector is its ability to limit the GC pause time (i.e. you can set the desired maximum pause time) without compromising on throughput.
gceasy.io is introducing a RESTful API to analyze Java GC logs. Here are a couple of use cases where this Java GC API can be used.
The article addresses sudden CPU spikes in Java applications, often caused by repeated Full Garbage Collections (GC) due to memory leaks and infinitely looping threads. It provides troubleshooting strategies using tools like gceasy.io for analyzing GC logs and fastthread.io for identifying looping threads, along with real-world examples demonstrating effective resolutions.