The first of two articles by @parttimenerd of #SweetSapMachine covering the draft of a new iterator-based stack walking #Java API, which builds the base for the follow-up article on safepoint-based profiling!
https://foojay.io/today/asyncgetcalltrace-reworked-frame-by-frame-with-an-iterative-touch/

#foojaytip

Have you ever wondered how safepoints are implemented in the #OpenJDK? Follow @parttimenerd from #SweetSapMachine down the rabbit hole into the inner workings of the JVM!

https://foojay.io/today/the-inner-workings-of-safepoints

#foojaytip

On Foojay :foojay:, @parttimenerd of #SweetSapMachine announces his brand new utility for #VSCodeJava to enable and simplify debugging when using jtreg, the test harness used by the Java JDK test framework.

https://foojay.io/today/debugging-openjdk-tests-in-vscode-without-losing-your-mind

#foojaytip

First he profiled his #Java code, then he created his own Java profilers, and now @parttimenerd of #SweetSapMachine is profiling the world! Check out his ongoing trip report on Foojay :foojay: Today!

https://foojay.io/today/report-of-my-small-tour-deurope/

#foojaytip

Understanding class loader hierarchies is essential when developing instrumenting #Java agents. So @parttimenerd from #SweetSapMachine wrote an article about it on Foojay :foojay: Today!

https://foojay.io/today/class-loader-hierarchies/

#foojaytip

Join @parttimenerd #SweetSapMachine on Foojay :foojay: and learn to write reproducible #Java profiling APIs to make it easier to check how a profiling API reacts to different scenarios!

https://foojay.io/today/mastering-the-art-of-controlling-the-jit-unlocking-reproducible-profiler-tests/

#foojaytip

Programmatic usage of the Async-profiler by @parttimenerd from #SweetSapMachine, using it in a library to gather profiling data of processes, including converters from JFR to flamegraphs with jattach to attach a native agent dynamically to JVM, plus commands!

https://foojay.io/today/using-async-profiler-and-jattach-programmatically-with-ap-loader/

#foojaytip

"Why is #AsyncGetCallTrace always called in the signal handler on top of the stack that we want to walk? Couldn't we just use AsyncGetCallTrace in a separate thread?" Find out about the questions that keep @parttimenerd from #SweetSapMachine up at night!

https://foojay.io/today/couldnt-we-just-use-asyncgetcalltrace-in-a-separate-thread/

#foojaytip

Ever wondered how to find #Java classes and dependencies that you don't actually use? Here @parttimenerd from #SweetSapMachine describes on Foojay :foojay: Today how to implement your own instrumenting #Java agent.

https://foojay.io/today/instrumenting-java-code-to-find-and-handle-unused-classes/

#foojaytip

"Profilers are not rocket science," @parttimenerd from #SweetSapMachine explains on Foojay :foojay: Today, and then continues his mission of demystifying the inner workings of profilers by writing one in 240 lines of pure #Java!

https://foojay.io/today/writing-a-profiler-in-240-lines-of-pure-java

#foojaytip

Famously, last week, @parttimenerd from #SweetSapMachine undermined every developer's faith in profilers ("Do You Trust Profilers? I Once Did Too.") This week, he makes things better by showing you how to automate the discovery of bugs in #Java profilers. Read it on Foojay :foojay: Today.

https://foojay.io/today/validating-java-profiling-apis/

#foojaytip

Ever wondered how to use the #Firefox Profiler to view your own #Java profiling data? In this brand new Foojay :foojay: Today article, by #SweetSapMachine @parttimenerd, gives you the foundations!

https://foojay.io/today/using-firefox-profiler-beyond-the-web

#foojaytip

How do profilers like #asyncprofiler work? How to write your own? Get your intense coding hat on because this brand new series by @parttimenerd from #SweetSapMachine tries to write a tiny sampling-based #profiler from scratch! Check it out on Foojay :foojay: Today...

https://foojay.io/today/writing-a-profiler-from-scratch-introduction

#foojaytip