v3.0.1

SAP interim release that works with JDK23.

Binary launcher and AsyncGetCallTrace replacement

v3.0

Features

• async-profiler#724: Binary launcher asprof
• async-profiler#751: Profile non-Java processes
• async-profiler#795: AsyncGetCallTrace replacement
• async-profiler#719: Classify execution samples into categories in JFR converter
• async-profiler#855: ctimer mode for accurate profiling without perf_events
• async-profiler#740: Profile CPU + Wall clock together
• async-profiler#736: Show targets of vtable/itable calls
• async-profiler#777: Show JIT compilation task
• async-profiler#644: RISC-V port
• async-profiler#770: LoongArch64 port

Improvements

• async-profiler#733: Make the same libasyncProfiler work with both glibc and musl
• async-profiler#734: Support raw PMU event descriptors
• async-profiler#759: Configure alternative profiling signal
• async-profiler#761: Parse dynamic linking structures
• async-profiler#723: --clock option to select JFR timestamp source
• async-profiler#750: --jfrsync may specify a list of JFR events
• async-profiler#849: Parse concatenated multi-chunk JFRs
• async-profiler#833: Time-to-safepoint JFR event
• async-profiler#832: Normalize names of hidden classes / lambdas
• async-profiler#864: Reduce size of HTML Flame Graph
• async-profiler#783: Shutdown asprof gracefully on SIGTERM
• Better demangling of C++ and Rust symbols
• DWARF unwinding for ARM64
• JfrReader can parse in-memory buffer
• Support custom events in JfrReader
• An option to read JFR file by chunks
• Record GCHeapSummary events in JFR

Bug fixes

• Workaround macOS crashes in SafeFetch
• Fixed attach to OpenJ9 on macOS
• Support UseCompressedObjectHeaders aka Lilliput
• Fixed allocation profiling on JDK 20.0.x
• Fixed context-switches profiling
• Prefer ObjectSampler to TLAB hooks for allocation profiling
• Improved accuracy of ObjectSampler in --total mode
• Make Flame Graph status line and search results always visible
• loop and timeout options did not work in some modes
• Restart interrupted poll/epoll_wait syscalls
• Fixed stack unwinding issues on ARM64
• Workaround for stale jmethodIDs
• Calculate ELF base address correctly
• Do not dump redundant threads in a JFR chunk
• check action prints result to a file
• Annotate JFR unit types with @ContentType

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