JVM/Java profiling and tuning

Manuals

Async-profiler - manual by use cases

[2025.04] Java/JVM native memory leaks

[2022.11] Finding heap memory leaks with Async-profiler

[2022.08] Performance tuning of Hazelcast SQL engine

[2022.04] Tracing a Single Operation in Distributed Systems

[2022.03] Everybody lies, profilers too

[2022.03] JVM thread state changes by example

[2021.08] Continuous profiling with async-profiler - long time to safepoint - logs vs swap

[2021.08] Continuous profiling with async-profiler

[2021.05] Full GC every hour after deploying new application version

[2021.05] Spring Session JDBC + Apereo CAS = Heap memory leak, and it is a documented feature

[2021.04] Spring Boot + Spring Security + Apereo CAS + Concurrent Session Control = Heap memory leak

[2021.01] How can inefficient algorithm degrade performance with innocent G1GC in the middle? Humongous object strikes back

[2020.12] From one JDK bug to another?

[2020.11] Can G1GC cause outage?

[2020.11] Time to safepoint - finally there is a tool to find long ones, and yes it is the async-profiler

[2020.11] JVM internals basics - Stop-the-world phase (safepoints) - how it works?

[2020.11] To tune or not to tune? G1GC vs humongous allocation

[2020.11] Biased lock disabled, again

[Safepoints] Introduction and safepoints logs

[JIT] JIT logs

[Classloader] Classloader logs - can attaching the JFR (and other profilers) cause the outage?

[GC] Heap after GC - do I have a memory leak?

[GC] Allocation rate

[GC][G1GC] Heap before GC - is my heap wasted?

[GC][G1GC] G1GC Stop-the-world phases

[GC][G1GC] Efficiency of the old generation cleanup

I created some tools that help me with profiling big application with Async-profiler:

Here is my open source JVM and GC logs analyzer:

Krzysztof Ślusarski