Mandatory Literature

• ASPROF Official - https://github.com/async-profiler/async-profiler
• ASPROF Manual - https://krzysztofslusarski.github.io/2022/12/12/async-manual.html
• PERF vs. JFR - https://bell-sw.com/announcements/2022/04/07/how-to-use-perf-to-monitor-java-performance
• Counting CPU samples - https://github.com/async-profiler/async-profiler/discussions/466
• CPU vs. itimer samples - https://github.com/async-profiler/async-profiler/issues/272
• Info about ctimer in golang - https://felixge.de/2022/02/11/profiling-improvements-in-go-1.18/
• DebugNonSafepoints - https://jpbempel.github.io/2022/06/22/debug-non-safepoints.html
  • DebugNonSafepoints may affect accuracy of the topmost virtual frames, but not a frame at the bottom of the stack
• Context-switches in ASPROF - https://github.com/async-profiler/async-profiler/issues/639
• Timing Differences between LOGS and JFR - https://mail.openjdk.org/pipermail/hotspot-gc-dev/2020-August/030581.html
• Frame pointers vs. DWARF - https://rwmj.wordpress.com/2023/02/14/frame-pointers-vs-dwarf-my-verdict
• DWARF in eBPF: https://www.polarsignals.com/blog/posts/2022/11/29/dwarf-based-stack-walking-us

Tuning

• https://inside.java/

TimerSlack

• https://bugs.openjdk.org/browse/JDK-8307766
• https://hazelcast.com/blog/locksupport-parknanos-under-the-hood-and-the-curious-case-of-parking/
• https://github.com/openjdk/jdk/blob/ac968c36d7cc2e13270d28c9310178f6b654d7dc/src/hotspot/os/linux/globals_linux.hpp#L76

JVM Virtual Calls

• https://github.com/async-profiler/async-profiler/issues/736

JVM Logging

• https://blog.arkey.fr/2020/07/28/embracing-jvm-unified-logging-jep-158-jep-271/

Garbage Collection

• All about Garbage Collection changes - https://tschatzl.github.io/
• Region pinning to avoid GCLocker initiated Garbage Collection - https://www.infoq.com/news/2023/12/region-pinning-to-g1-gc/
• G1 Pre-barrier - https://albertnetymk.github.io/2022/07/22/g1_barrier

Java Flight Recorder

• All JFR Events - https://sap.github.io/SapMachine/jfrevents/
• JFR View command - https://egahlin.github.io/2023/05/30/views.html
• JFR Streaming - https://hirt.se/blog/?p=1239
• JFR Streaming (JEP) - https://openjdk.org/jeps/349
• JFR Remote Streaming - https://egahlin.github.io/2021/05/17/remote-recording-stream.html
• Compressing Flight Recordings - https://hirt.se/blog/?p=1166
• JFR CLI Configuration - https://egahlin.github.io/2022/05/31/improved-ergonomics.html
• The JDK Flight Recorder File Format - https://www.morling.dev/blog/jdk-flight-recorder-file-format/
• JFR Event Throttler - https://github.com/openjdk/jdk/blob/jdk-17+19/src/hotspot/share/jfr/recorder/service/jfrEventThrottler.hpp
• JFR Analytics - https://github.com/moditect/jfr-analytics
• JFR Checkpoint Event - https://mail.openjdk.org/pipermail/hotspot-jfr-dev/2020-February/001154.html
• Programmer’s Guide to JDK Flight Recorder - https://www.youtube.com/watch?v=AgFOJEkBVjg
• Sources - JCMD command - https://github.com/openjdk/jdk/blob/master/src/jdk.jfr/share/classes/jdk/jfr/internal/dcmd/DCmdStart.java
• Sources - JFR command - https://github.com/openjdk/jdk/blob/master/src/jdk.jfr/share/classes/jdk/jfr/internal/tool/Command.java
• Sources - ExecutionSample Event (algorithm) - https://github.com/openjdk/jdk/blob/master/src/hotspot/share/jfr/periodic/sampling/jfrThreadSampler.cpp

JVM JIT

• JIT thresholds - https://www.lmax.com/blog/staff-blogs/2016/03/05/observing-jvm-warm-effects/
• JIT print format - https://github.com/openjdk/jdk/blob/0cf1a558bacf18d9fc41e43fb5e9eba39dc51f2e/src/hotspot/share/compiler/compileTask.cpp#L410-L452
• JIT Directives - https://mostlynerdless.de/blog/2023/05/18/mastering-the-art-of-controlling-the-jit-unlocking-reproducible-profiler-tests/

Metaspace

• https://blogs.sap.com/2021/07/16/jep-387-elastic-metaspace-a-new-classroom-for-the-java-virtual-machine/?s=03

OpenJDK Common Info

• Hotspot Options - https://chriswhocodes.com/hotspot_options_openjdk18.html
• OpenJDK Standard Library DIFF - https://javaalmanac.io/
• All JEPS - https://chriswhocodes.com/jepsearch.html

Others

• Trusted final fields - https://github.com/openjdk/jdk/blob/126f2ace5d36c72a8fced27218a66e0b6f920f85/src/hotspot/share/ci/ciField.cpp#L219-L254
• Off-heap analysis - https://blog.arkey.fr/2020/11/30/off-heap-reconnaissance/
• Object Headers - https://bugs.openjdk.org/browse/JDK-8294992
• Heap Trimming -https://github.com/openjdk/jdk/pull/10085
• Enabling Huge Pages - https://wiki.openjdk.org/display/zgc#Main-EnablingLargePagesOnLinux