Async-profiler binaries published automatically from the latest sources in master upon a successful build.

v4.0

Features

• #895, #905: jfrconv binary and numerous converter enhancements
• #944: Interactive Heatmap
• #1064: Native memory leak profiler
• #1002: An option to display instruction addresses
• #1007: Optimize wall clock profiling
• #1073: Productize VMStructs-based stack walker: --cstack vm/vmx
• #1169: C API for accessing thread-local profiling context

Improvements

• #923: Support JDK 23+
• #952: Solve musl and glibc compatibility issues; link libstdc++ statically
• #955: --libpath option to specify path to libasyncProfiler.so in a container
• #1018: --grain converter option to coarsen flame graphs
• #1046: --nostop option to continue profiling outside --begin/--end window
• #1178: --inverted option to flip flame graphs vertically
• #1009: Allows collecting allocation and live object traces at the same time
• #925: An option to accumulate JFR events in memory instead of flushing to a file
• #929: Load symbols from debuginfod cache
• #982: Sample contended locks by overflowing interval bucket
• #993: Filter native frames in allocation profile
• #896: FlameGraph: Alt+Click to remove stacks
• #1097: FlameGraph: N/Shift+N to navigate through search results
• #1182: Retain by-thread grouping when reversing FlameGraph
• #1167: Log when no samples are collected
• #1044: Fall back to ctimer for CPU profiling when perf_events are unavailable
• #1068: Count missed samples when estimating total CPU time in ctimer mode
• #1142: Use counter-timer register for timestamps on ARM64
• #1123: Support clock=tsc without a JVM
• #1070: Demangle Rust v0 symbols
• #1007: Use ExecutionSample event for CPU profiling and WallClockSample for Wall clock profiling
• #1011: Obtain can_generate_sampled_object_alloc_events JVMTI capability only when needed
• #1013: Intercept java.util.concurrent locks more efficiently
• #759: Discover available profiling signal automatically
• #884: Record event timestamps early
• #885: Print error message if JVM fails to load libasyncProfiler
• #892: Resolve tracepoint id in asprof
• Suppress dynamic attach warning on JDK 21+

Bug fixes

• #1143: Crash on macOS when using thread filter
• #1125: Fixed parsing concurrently loaded libraries
• #1095: jfr print fails when a recording has empty pools
• #1084: Fixed Logging related races
• #1074: Parse both .rela.dyn and .rela.plt sections
• #1003: Support both tracefs and debugfs for kernel tracepoints
• #986: Profiling output respects loglevel
• #981: Avoid JVM crash by deleting JNI refs after GetMethodDeclaringClass
• #934: Fix crash on Zing in a native thread
• #843: Fix race between parsing and concurrent unloading of shared libraries
• #1147, #1151: Deadlocks with jemalloc and tcmalloc profilers
• Stack walking fixes for ARM64
• Converter fixes for jfrsync profiles
• Fixed parsing non-PIC executables and shared objects with non-standard section layout
• Fixed recursion in pthread_create when using native profiling API
• Fixed crashes on Alpine when profiling native apps
• Fixed warnings with -Xcheck:jni
• Fixed "Unsupported JVM" on OpenJ9 JDK 21
• Fixed DefineClass crash on OpenJ9
• JfrReader should handle custom events properly
• Handle truncated JFRs

Project Infrastructure

• Restructure and update documentation
• Implement test framework; add new integration tests
• Unit test framework for C++ code
• Run CI on all supported platforms
• Test multiple JDK versions in CI
• Add GHA to validate license headers
• Add Markdown checker and formatter
• Add Issue and Pull Request templates
• Add Contributing Guidelines and Code of Conduct
• Run static analyzer and fix found issues (#1034, #1039, #1049, #1051, #1098)
• Provide Dockerfile for building async-profiler release packages
• Publish nightly builds automatically

v3.0

Features

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

Improvements

• #733: Make the same libasyncProfiler work with both glibc and musl
• #734: Support raw PMU event descriptors
• #759: Configure alternative profiling signal
• #761: Parse dynamic linking structures
• #723: --clock option to select JFR timestamp source
• #750: --jfrsync may specify a list of JFR events
• #849: Parse concatenated multi-chunk JFRs
• #833: Time-to-safepoint JFR event
• #832: Normalize names of hidden classes / lambdas
• #864: Reduce size of HTML Flame Graph
• #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

v2.9

Features

• Java Heap leak profiler
• meminfo command to print profiler's memory usage
• Profiler API with embedded agent as a Maven artifact

Improvements

• --include/--exclude options in the FlameGraph converter
• --simple and --dot options in jfr2flame converter
• An option for agressive recovery of [unknown_Java] stack traces
• Do not truncate signatures in collapsed format
• Display inlined frames under a runtime stub

Bug fixes

• Profiler did not work with Homebrew JDK
• Fixed allocation profiling on Zing
• Various jfrsync fixes
• Symbol parsing fixes
• Attaching to a container on Linux 3.x could fail

v1.8.8

Bug fixes

• Could not find NativeLibrary_load on JDK 11.0.15

v2.8.3

Improvements

• Support virtualized ARM64 macOS
• A switch to generate auxiliary events by async-profiler or FlightRecorder in jfrsync mode

Bug fixes

• Could not recreate perf_events after the first failure
• Handle different versions of Zing properly
• Do not call System.loadLibrary, when libasyncProfiler is preloaded

v2.8.2

Bug fixes

• The same .so works with glibc and musl
• dlopen hook did not work on Arch Linux
• Fixed JDK 7 crash
• Fixed CPU profiling on Zing

Changes

• Mark interpreted frames with _[0] in collapsed output
• Double click selects a method name on a flame graph

v2.8.1

Improvements

• JFR to pprof converter (contributed by @NeQuissimus)
• JFR converter improvements: time range, collapsed output, pattern highlighting
• %n pattern in file names; limit number of output files
• --lib to customize profiler library path in a container
• profiler.sh list command now works without PID

Bug fixes

• Fixed crashes related to continuous profiling
• Fixed Alpine/musl compatibility issues
• Fixed incomplete collapsed output due to weird locale settings
• Workaround for JDK-8185348

v2.8

Features

• Mark top methods as interpreted, compiled (C1/C2), or inlined
• JVM TI based allocation profiling for JDK 11+
• Embedded HTTP management server

Improvements

• Re-implemented stack recovery for better reliability
• Add loglevel argument
• Do not mmap perf page in --all-user mode
• Distinguish runnable/sleeping threads in OpenJ9 wall-clock profiler
• --cpu converter option to extract CPU profile from the wall-clock output