Maintenance release

v2.5.1

Bug fixes

• Prevent early unloading of libasyncProfiler.so
• Read kernel symbols only for perf_events
• Escape backslashes in flame graphs
• Avoid duplicate categories in jfrsync mode
• Fixed stack overflow in RedefineClasses
• Fixed deadlock when flushing JFR

Improvements

• Support OpenJDK C++ Interpreter (aka Zero)
• Allow reading incomplete JFR recordings

macOS/ARM64 port and many JFR improvements

v2.5

Features

• macOS/ARM64 (aka Apple M1) port
• PPC64LE port (contributed by @ghaug)
• Profile low-privileged processes with perf_events (contributed by @Jongy)
• Raw PMU events; kprobes & uprobes
• Dump results in the middle of profiling session
• Chunked JFR; support JFR files larger than 2 GB
• Integrate async-profiler events with JDK Flight Recordings

Improvements

• Use RDTSC for JFR timestamps when possible
• Show line numbers and bci in Flame Graphs
• jfr2flame can produce Allocation and Lock flame graphs
• Flame Graph title depends on the event and --total
• Include profiler logs and native library list in JFR output
• Lock profiling no longer requires JVM symbols
• Better container support
• Native function profiler can count the specified argument
• An option to group threads by scheduling policy
• An option to prepend library name to native symbols

Notes

• macOS build is provided as a fat binary that works both on x86-64 and ARM64
• 32-bit binaries are no longer shipped. It is still possible to build them from sources
• Dropped JDK 6 support (may still work though)

Maintenance release

v1.8.7

Bug fixes

• Workaround for JDK-8173361
• Backported fix for "Accept timed out" exception

Maintenance release

v1.8.6

Improvements

• log=none option to suppress warnings about missing JVM symbols
• Sign macOS binaries

Bug fixes

• Workaround for JDK-8212160

macOS/AArch64 support

This is an Early Access release of async-profiler with the native support for Apple silicon.

Maintenance release

v1.8.5

Improvements

• Backported JFR to FlameGraph converter

Bug fixes

• Stricter safemode to avoid stack walking in suspicious cases

Multievent profiling. JFR v2 compatible output

v2.0

Features

• Profile multiple events together (cpu + alloc + lock)
• HTML 5 Flame Graphs: faster rendering, smaller size
• JFR v2 output format, compatible with FlightRecorder API
• JFR to Flame Graph converter
• Automatically turn profiling on/off at --begin/--end functions
• Time-to-safepoint profiling: --ttsp

Improvements

• Unlimited frame buffer. Removed -b option and 64K stack traces limit
• Additional JFR events: OS, CPU, and JVM information; CPU load
• Record bytecode indices / line numbers
• Native stack traces for Java events
• Improved CLI experience
• Better error handling; an option to log warnings/errors to a dedicated stream
• Reduced the amount of unknown stack traces

Changes

• Removed non-ASL code. No more CDDL license

Maintenance release

v1.8.4

Improvements

• Smaller and faster agent library

Bug fixes

• Fixed JDK 7 crash during wall-clock profiling

Maintenance release

v1.8.3

Improvements

• libasyncProfiler.dylib symlink on macOS

Bug fixes

• Fixed possible deadlock on non-HotSpot JVMs
• Gracefully stop profiler when terminating JVM
• Fixed GetStackTrace problem after RedefineClasses

Maintenance release

v1.8.2

Improvements

• AArch64 build is now provided out of the box
• Compatibility with JDK 15 and JDK 16

Bug fixes

• More careful native stack walking in wall-clock mode
• resume command is not compatible with JFR format
• Wrong allocation sizes on JDK 8u262