Technology Performance Pulse

Classloaders in JVM: An Overview

DZone

MAY 10, 2023

Classloaders are an essential part of the Java Virtual Machine (JVM), but many developers consider them to be mysterious. This article aims to demystify the subject by providing a basic understanding of how class loading works in the JVM. This is where we need classloaders. Class loaders are used to load.class files into the memory.

Java

Java Virtualization Processing Development

Does the JVM Eliminate Allocations of Temporary Objects?

DZone

APRIL 9, 2021

Should you be concerned about temporary Java objects or can the JVM eliminate them for you, maybe by replacing them with implicit static instances? Consider the following example:

Java

Does the 32-Bit JVM or 64-Bit JVM Decision Matter Anymore?

DZone

JULY 22, 2019

There are a few distinct differences and subtle nuances between 32-bit JVM and 64-bit JVM. Do I need to understand the difference between 32-bit JVM and 64-bit JVM? The subtle difference between 32-bit JVM and 64-bit JVM wouldn’t make much difference to your application.

Performance

Performance Tuning Java

OutOfMemoryError-Related JVM Arguments

DZone

AUGUST 5, 2019

The JVM has provided helpful arguments to deal with OutOfMemoryError. In this article, we would like to highlight those JVM arguments. Those JVM arguments are: -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath. Let’s discuss these JVM arguments in detail in this article. XX:OnOutOfMemoryError. -XX:+ExitOnOutOfMemoryError.

Java

Java Performance

How Does JVM Handle Polymorphism Internally

DZone

NOVEMBER 21, 2019

How does JVM handle Polymorphism. In this article, we will see How Does JVM Handle Method Overloading And Overriding Internally, how JVM identifies which method should get called. In this article, we will see How Does JVM Handle Method Overloading And Overriding Internally, how JVM identifies which method should get called.

Java

Java Performance

Is Your JVM Leaking File Descriptors — Like Mine?

DZone

OCTOBER 10, 2019

Is your JVM leaking? The two issues described here were discovered and fixed more than a year ago. This article only serves as historical proof and a beginners' guide on tackling file descriptor leaks in Java.

Java

Java Performance

JVM Profiler: An Open Source Tool for Tracing Distributed JVM Applications at Scale

Uber Engineering

JUNE 28, 2018

To help us better leverage this data, we manage massive deployments of Spark … The post JVM Profiler: An Open Source Tool for Tracing Distributed JVM Applications at Scale appeared first on Uber Engineering Blog. For Uber, data is at the heart of strategic decision-making and product development.

Open Source

Open Source Engineering Development Architecture

Diagnose CPU Spikes in a Non-Intrusive Manner

DZone

AUGUST 30, 2023

Works on all JVM languages: In this post, we are going to discuss a non-intrusive approach (i.e., an approach that doesn’t add any noticeable overhead to the application) to diagnose CPU spikes. Thus, you can use this approach in your production environment to troubleshoot CPU spikes.

How To Create a GraalVM Docker Image

DZone

APRIL 5, 2023

A GraalVM native image does not need a JVM, so can you use a more minimalistic Docker base image for example? Nowadays, applications are often distributed as Docker images, so it is interesting to verify how this is done for a GraalVM native image. You will execute some experiments during this blog and will learn by doing.

Java Parallel GC Tuning

DZone

SEPTEMBER 8, 2023

Parallel garbage collector (Parallel GC) is one of the oldest Garbage Collection algorithms introduced in JVM to leverage the processing power of modern multi-core systems. Parallel GC aims to reduce the impact of GC pauses by utilizing multiple threads to perform garbage collection in parallel.

Tuning

Tuning Java Systems Processing

Allegro Reduces Kafka Producer Latency Outliers by 82% After Switching to XFS

InfoQ

APRIL 26, 2024

The company used Kafka protocol sniffing, JVM profiling, and eBPF, which proved instrumental in identifying and eliminating performance bottlenecks. Allegro experimented with different performance optimization options to improve Apache Kafka producer tail latency and eventually switched all its clusters to the XFS filesystem.

Latency

Latency Performance Tuning Design

Resolving the Memory Saturation Error

DZone

FEBRUARY 24, 2023

In this blog, we are going to look at the resolution to the memory saturation error reported by Dynatrace on a machine that hosts multiple JVM s. The memory saturation error is thrown from Dynatrace when the memory usage goes beyond 80% and the page faults go beyond 20-page faults/second on a Linux machine.

OneAgent release notes version 1.217

Dynatrace

JUNE 8, 2021

Added support for Oracle Hotspot JVM 16 for Linux, Alpine Linux 64-bit (ARM64 (AArch64)). Added support for Oracle Hotspot JVM 16 for Linux, Alpine Linux 64-bit (x86), Solaris (x86), Windows (x86). Added support for Oracle Hotspot JVM 16 for Solaris (SPARC).

Operating System

Operating System Google Java Servers

AI-driven analysis of Spring Micrometer metrics in context, with typology at scale

Dynatrace

APRIL 7, 2022

One of these solutions is Micrometer which provides 17+ pre-instrumented JVM-based frameworks for data collection and enables instrumentation code with a vendor-neutral API. To remain flexible in observing all technologies used in their organization, some companies choose open-source solutions, which allow them to stay vendor-neutral.

Metrics

Metrics Latency Java Cache

Escape Analysis in Java 6 Update 14 - Some Informal Benchmarks

DZone

JULY 24, 2022

As well as the usual collection of bug fixes, this release includes some experimental new features designed to improve the performance of the JVM (see the release notes ). Sun released update 14 of the Java 6 JDK and JRE. One of these is Escape Analysis. What Is Escape Analysis?

Java

Java Benchmarking Design Performance

Bending pause times to your will with Generational ZGC

The Netflix TechBlog

MARCH 5, 2024

By Danny Thomas, JVM Ecosystem Team The latest long term support release of the JDK delivers generational support for the Z Garbage Collector. The surprising and not so surprising benefits of generations in the Z Garbage Collector.

Latency

Latency Java Tuning Efficiency

Heap Memory In Java Applications Performance Testing

DZone

JUNE 17, 2020

By not having enough knowledge and experience in Java, how the JVM and garbage collector will work, and how Java memory is built, many performance engineers fail to find and address the java bottlenecks when we execute Java application performance testing.

Java

Java Performance Testing Performance Testing

Log4j 2 Vulnerability: Identifying and Minimizing Production Risk

Dynatrace

DECEMBER 12, 2021

OwnerResource (highlighted) is the service running on the JVM loading the vulnerable log4j 2 library. In other words, as depicted below, a live topology model, such as the Smartscape , allows for identifying all affected web applications through simply traversing the graph from the JVM which loaded the vulnerable library. Conclusion.

Java

Java Internet Internet Database

Java memory optimizations: 3x Jenkins performance improvement with Dynatrace

Dynatrace

APRIL 10, 2020

As a negative side effect, the team ran into a JVM bug which they could workaround though. Looked like a classical Thread Leaking issue: Dynatrace observed a thread leak after switching to Java 11 causing the JVM peak at 8k threads. But let’s start from the beginning: Step #1 – Switching to Java 11. Step #4 – JDK 11 thread leak.

Java

Java Performance DevOps Engineering

Cloud operations and observability boost resilience for American Family

Dynatrace

APRIL 22, 2022

American Family created an on-premises synthetic monitor that automatically restarts a JVM if it has a 503 error. This will remove the JVM from the load balancer, restart the JVM, and put the JVM back into the rotation. “All this takes place with no impact to the customer,” he adds.

Cloud

Cloud Lambda Serverless AWS

Kubernetes in the wild report 2023

Dynatrace

JANUARY 16, 2023

Java Virtual Machine (JVM)-based languages are predominant. Accordingly, 65% of all application workloads run in a JVM, including related application servers like Tomcat or Spring. The Dynatrace OneAgent automatically detects the specific programming languages of every individual application workload running on Kubernetes.

Open Source

Open Source Java Operating System Programming

AI-driven analysis of Spring Micrometer metrics in context, with topology at scale

Dynatrace

APRIL 7, 2022

One of these solutions is Micrometer which provides 17+ pre-instrumented JVM-based frameworks for data collection and enables instrumentation code with a vendor-neutral API. To remain flexible in observing all technologies used in their organization, some companies choose open-source solutions, which allow them to stay vendor-neutral.

Metrics

Metrics Latency Java Cache

AI-driven analysis of Spring Micrometer metrics in context, with topology at scale

Dynatrace

APRIL 7, 2022

One of these solutions is Micrometer which provides 17+ pre-instrumented JVM-based frameworks for data collection and enables instrumentation code with a vendor-neutral API. To remain flexible in observing all technologies used in their organization, some companies choose open-source solutions, which allow them to stay vendor-neutral.

Metrics

Metrics Latency Java Cache

Top 9 Free Java Process Monitoring Tools and How to Choose One

DZone

APRIL 18, 2019

To help equip you for the ongoing process of optimization and the life of debugging ahead of you, we’ve gathered a list of the best tools to monitor the JVM in both development and production environments. A Java Profiler is a tool that monitors Java bytecode constructs and operations at the JVM level. And the best part?

Java

Java Processing Monitoring Code

Measuring Performance of Your Methods Using JMH in Java

DZone

JANUARY 22, 2020

JMH is developed by the same people who implement the Java virtual machine (JVM) so they know the internals and how Java makes optimizations at run time. From JDK-12 onwards, the JDK comes with JMH (Java Microbenchmark Harness), It is a toolkit that helps you implement Java microbenchmarks correctly.

Java

Java Benchmarking Performance Virtualization

A guide to Autonomous Performance Optimization

Dynatrace

SEPTEMBER 15, 2020

Stefano started his presentation by showing how much cost and performance optimization is possible when knowing how to properly configure your application runtimes, databases, or cloud environments: Correct configuration of JVM parameters can save up to 75% resource utilization while delivering same or better performance!

Performance

Performance Java Metrics Cloud

Log4Shell vulnerability: Identifying and minimizing production risk

Dynatrace

DECEMBER 12, 2021

OwnerResource (highlighted) is the service running on the JVM loading the vulnerable log4j 2 library. In other words, as depicted below, a live topology model, such as the Smartscape , allows for identifying all affected web applications through simply traversing the graph from the JVM which loaded the vulnerable library. Conclusion.

Java

Java Internet Internet Database

Why Does the JIT Continually Recompile the Same Method?

DZone

APRIL 4, 2021

A Stack Overflow user noticed frequent recompilations, even after a substantial JVM uptime, and couldn't find an explanation based on the common knowledge on JIT compilers. We know that the Java JIT compiler compiles and recompiles methods based on usage statistics. As a method gets called repeatedly, interpretation moves to JIT compilation.

Java

Java Strategy

Remote Debugging Java Applications With JDWP

DZone

JULY 16, 2019

Sometimes, however, the debuggee JVM is launched from a separate command line, or by executing it on a separate host. In such scenarios, debugging necessitates launching the JVM with some options suitable for debugging, while your IDE debugger would have to connect to it. to evaluate a local variable), and replies by the JVM.

Java

Java Transportation Programming Development

How to Tune Garbage Collection in Java

DZone

APRIL 21, 2019

Garbage collection is the mechanism by which the JVM reclaims memory on behalf of the application when it's no longer needed. At a high level, it consists of finding objects that are no longer in use, freeing the memory associated with those objects, and occasionally compacting the heap to prevent memory fragmentation.

Tuning

Tuning Java Performance

OneAgent release notes version 1.241

Dynatrace

JUNE 8, 2022

Added support for Oracle Hotspot JVM 18. Added support for SAP JVM 18. With this release, the oldest supported OneAgent versions are: Dynatrace ONE. Dynatrace ONE Premium. Added support for Apache HttpClient 5.x. Added support for OpenJDK 18. Added support for Azul Platform Core (Zulu) 18.

Java

Java Operating System Lambda Serverless

The Return of the Frame Pointers

Brendan Gregg

MARCH 16, 2024

I ended up developing a fix for the JVM c2 compiler which Oracle reworked and added as the -XX:+PreserveFramePointer option in JDK8u60 (see my Java in Flames post for details [ PDF ]). Doesn't exist for JIT'd runtimes like the Java JVM, and I don't really see any practical way to ever fix that.

Java

Java Cache Google Hardware

New critical vulnerability, CVE-2022-42889, in Apache Commons Text discovered (but no need to panic)

Dynatrace

OCTOBER 18, 2022

the standard lookups include interpolators that could make this vulnerability exploitable: “script” to execute expressions using the JVM (or Java Virtual Machine) script execution engine (javax.script), “dns” to resolve DNS records. Starting with version 1.5, url” to load values from remote servers via URLs.

Java

Java Open Source Virtualization Code

OneAgent release notes version 1.203

Dynatrace

OCTOBER 14, 2020

Added support for Oracle Hotspot JVM 15 for Linux, Alpine Linux 64-bit (ARM64 (AArch64)). Added support for Oracle Hotspot JVM 15 for Linux, Alpine Linux 64-bit (x86), Solaris (x86), Windows (x86). Added support for Oracle Hotspot JVM 15 for Solaris (SPARC). Added support for Go 1.15

Operating System

Operating System Java Google Servers

Dynatrace SaaS release notes version 1.240

Dynatrace

APRIL 28, 2022

JVM heap memory chart no longer aggregates non-heap memory pools on Process details page. (APM-362323). Fixed filtering for alternative network zones on the “Deployment status > Network zones” edit page for a single network zone. (APM-362134). APM-362134). APM-362970). APM-362323).

Tuning

Tuning Network Monitoring Availability

How Java Profilers Work

DZone

MAY 9, 2019

Java profilers monitor JVM execution at the bytecode level and can provide information on thread execution and locks, heap memory usage, garbage collection, hot methods, exceptions, class loading, and more. How Java Profilers Work.

Java

Java Monitoring Code Performance

Uplevel production resiliency with automated problem remediation

Dynatrace

JULY 20, 2022

Process restarts (for example, JVM memory leaks) —Trigger a service restart or related actions for applications with underlying bug fixes that have been deprioritized or delayed.

DevOps

DevOps Innovation Cloud Tuning

Announcing Cryostat 2.0: JDK Flight Recorder for Containers

InfoQ

NOVEMBER 29, 2021

Cryostat, a container-native JVM application developed by Red Hat, provides an API for monitoring and profiling Java containers using Java Flight Recorder (JFR). Cryostat brings JFR to container age allowing analysis and profiling of multiple JVMs directly from a central hub. By Andrea Messetti.

Java

Java Monitoring Development Design

Optimizing Java XPath CPU and memory overhead by 98%

Dynatrace

MARCH 9, 2022

One the one side it turns out that there was extremely high garbage collection activity by the JVM due to very high memory allocations: A good point to start on any runtime is to look at key performance indicators such as Garbage Collection and Suspensions. Increase JVM memory limits to better handle spike load.

Java

Java Traffic Government Code

Dynatrace Runtime Vulnerability Analysis now covers the entire application stack

Dynatrace

AUGUST 11, 2022

Runtimes like Java Virtual Machine (JVM) and.NET CLR, or Node.js The Dynatrace Davis AI engine aggregates vulnerability data in real time and recommends actions to improve the security of your Go applications. Vulnerability Analysis for language runtimes completes the picture.

Java

Java Cloud Virtualization DevOps

Radically speed up your code by fixing slow or frequent garbage collection

Dynatrace

APRIL 8, 2020

One is that with increased load, the amount of CPU consumed by your JVM increases but the memory is used more by garbage collection than your application. To see why, navigate to the Suspension chart on the JVM metrics tab. . This means that for 6 seconds out of every minute, your JVM stops all application threads.

Speed

Speed Code Java Lambda

Large or Small Memory Size for My App?

DZone

AUGUST 15, 2019

After building applications for 2 decades, after building JVM performance engineering/troubleshooting tools ( GCeasy , FastThread , HeapHero ), I still don’t know the right answer to this question. Should I be running my application with few instances (i.e. machines) with large memory size or a lot of instances with small memory size?

Strategy

Strategy Engineering Technology Technology

OneAgent release notes version 1.201

Dynatrace

SEPTEMBER 21, 2020

Added support for Graal JVM 8, 11 for Linux (x86), Linux, Alpine Linux 64-bit (x86), Windows (x86). Oracle Hotspot JVM 13. Added support for OpenJDK 15 for Linux, Alpine Linux 64-bit (x86), Windows (x86). Operating systems. Current support changes. Current OneAgent support changes.

Operating System

Operating System Java Google Technology

Optimizing your Kubernetes clusters without breaking the bank

Dynatrace

JANUARY 14, 2022

JVM, databases, middleware, operating system, cloud instances, etc) by also taking advantage of Dynatrace full-stack observability. Conclusions. The Akamas approach can be effectively applied to any application by also including any other relevant parameters (e.g. Additional resources.

Latency

Latency Tuning Efficiency AWS

Classloaders in JVM: An Overview

Does the JVM Eliminate Allocations of Temporary Objects?

Trending Sources

Does the 32-Bit JVM or 64-Bit JVM Decision Matter Anymore?

OutOfMemoryError-Related JVM Arguments

How Does JVM Handle Polymorphism Internally

Is Your JVM Leaking File Descriptors — Like Mine?

JVM Profiler: An Open Source Tool for Tracing Distributed JVM Applications at Scale

Diagnose CPU Spikes in a Non-Intrusive Manner

How To Create a GraalVM Docker Image

Java Parallel GC Tuning

Allegro Reduces Kafka Producer Latency Outliers by 82% After Switching to XFS

Resolving the Memory Saturation Error

OneAgent release notes version 1.217

AI-driven analysis of Spring Micrometer metrics in context, with typology at scale

Escape Analysis in Java 6 Update 14 - Some Informal Benchmarks

Bending pause times to your will with Generational ZGC

Heap Memory In Java Applications Performance Testing

Log4j 2 Vulnerability: Identifying and Minimizing Production Risk

Java memory optimizations: 3x Jenkins performance improvement with Dynatrace

Cloud operations and observability boost resilience for American Family

Kubernetes in the wild report 2023

AI-driven analysis of Spring Micrometer metrics in context, with topology at scale

AI-driven analysis of Spring Micrometer metrics in context, with topology at scale

Top 9 Free Java Process Monitoring Tools and How to Choose One

Measuring Performance of Your Methods Using JMH in Java

A guide to Autonomous Performance Optimization

Log4Shell vulnerability: Identifying and minimizing production risk

Why Does the JIT Continually Recompile the Same Method?

Remote Debugging Java Applications With JDWP

How to Tune Garbage Collection in Java

OneAgent release notes version 1.241

The Return of the Frame Pointers

New critical vulnerability, CVE-2022-42889, in Apache Commons Text discovered (but no need to panic)

OneAgent release notes version 1.203

Dynatrace SaaS release notes version 1.240

How Java Profilers Work

Uplevel production resiliency with automated problem remediation

Announcing Cryostat 2.0: JDK Flight Recorder for Containers

Optimizing Java XPath CPU and memory overhead by 98%

Dynatrace Runtime Vulnerability Analysis now covers the entire application stack

Radically speed up your code by fixing slow or frequent garbage collection

Large or Small Memory Size for My App?

OneAgent release notes version 1.201

Optimizing your Kubernetes clusters without breaking the bank

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