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CHANGELOG.md

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Changelog

[2.7] - 2022-02-14

Features

  • Experimental support for OpenJ9 VM
  • DWARF stack unwinding

Improvements

  • Better handling of VM threads (fixed missing JIT threads)
  • More reliable recovery from not_walkable AGCT failures
  • Do not accept unknown agent arguments

[2.6] - 2022-01-09

Features

  • Continuous profiling; loop and timeout options

Improvements

  • Reliability improvements: avoid certain crashes and deadlocks
  • Smaller and faster agent library
  • Minor jfr and jfrsync enhancements (see the commit log)

[2.5.1] - 2021-12-05

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

[2.5] - 2021-10-01

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)

[2.0] - 2021-03-14

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

[1.8.4] - 2021-02-24

Improvements

  • Smaller and faster agent library

Bug fixes

  • Fixed JDK 7 crash during wall-clock profiling

[1.8.3] - 2021-01-06

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

[1.8.2] - 2020-11-02

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

[1.8.1] - 2020-09-05

Improvements

  • Possibility to specify application name instead of pid (contributed by @yuzawa-san)

Bug fixes

  • Fixed long attach time and slow class loading on JDK 8
  • UnsatisfiedLinkError during Java method profiling
  • Avoid reading /proc/kallsyms when --all-user is specified

[1.8] - 2020-08-10

Features

  • Converters between different output formats:
    • JFR -> nflx (FlameScope)
    • Collapsed stacks -> HTML 5 Flame Graph

Improvements

  • profiler.sh no longer requires bash (contributed by @cfstras)
  • Fixed long attach time and slow class loading on JDK 8
  • Fixed deadlocks in wall-clock profiling mode
  • Per-thread reverse Flame Graph and Call Tree
  • ARM build now works with ARM and THUMB flavors of JDK

Changes

  • Release package is extracted into a separate folder

[1.7.1] - 2020-05-14

Features

  • LBR call stack support (available since Haswell)

Improvements

  • --filter to profile only specified thread IDs in wall-clock mode
  • --safe-mode to disable selected stack recovery techniques

[1.7] - 2020-03-17

Features

  • Profile invocations of arbitrary Java methods
  • Filter stack traces by the given name pattern
  • Java API to filter monitored threads
  • --cstack/--no-cstack option

Improvements

  • Thread names and Java thread IDs in JFR output
  • Wall clock profiler distinguishes RUNNABLE vs. SLEEPING threads
  • Stable profiling interval in wall clock mode
  • C++ function names as events, e.g. -e VMThread::execute
  • check command to test event availability
  • Allow shading of AsyncProfiler API
  • Enable CPU profiling on WSL
  • Enable allocation profiling on Zing
  • Reduce the amount of unknown_Java samples

[1.6] - 2019-09-09

Features

  • Pause/resume profiling
  • Allocation profiling support for JDK 12, 13 (contributed by @rraptorr)

Improvements

  • Include all AsyncGetCallTrace failures in the profile
  • Parse symbols of JNI libraries loaded in runtime
  • The agent autodetects output format by the file extension
  • Output file name patterns: %p and %t
  • -g option to print method signatures
  • -j can increase the maximum Java stack depth
  • Allocaton sampling rate can be adjusted with -i
  • Improved reliability on macOS

Changes

  • -f file names are now relative to the current shell directory

[1.5] - 2019-01-08

Features

  • Wall-clock profiler: -e wall
  • -e itimer mode for systems that do not support perf_events
  • Native stack traces on macOS
  • Support for Zing runtime, except allocation profiling

Improvements

  • --all-user option to allow profiling with restricted perf_event_paranoid (contributed by @jpbempel)
  • -a option to annotate method names
  • Improved attach to containerized and chroot'ed JVMs
  • Native function profiling now accepts non-public symbols
  • Better mapping of Java thread names (contributed by @KirillTim)

Changes

  • Changed default profiling engine on macOS
  • Fixed the order of stack frames in JFR format

[1.4] - 2018-06-24

Features

  • Interactive Call tree and Backtrace tree in HTML format (contributed by @rpulle)
  • Experimental support for Java Flight Recorder (JFR) compatible output

Improvements

  • Added units: ms, us, s and multipliers: K, M, G for interval argument
  • API and command-line option -v for profiler version
  • Allow profiling containerized JVMs on older kernels

Changes

  • Default CPU sampling interval reduced to 10 ms
  • Changed the text format of flat profile

[1.3] - 2018-05-13

Features

  • Profiling of native functions, e.g. malloc

Improvements

  • JDK 9, 10, 11 support for heap profiling with accurate stack traces
  • root can now profile Java processes of any user
  • -j option for limiting Java stack depth

[1.2] - 2018-03-05

Features

  • Produce SVG files out of the box; flamegraph.pl is no longer needed
  • Profile ReentrantLock contention
  • Java API

Improvements

  • Allocation and Lock profiler now works on JDK 7, too
  • Faster dumping of results

Changes

  • total counter of allocation profiler now measures heap pressure (like JMC)

[1.1] - 2017-12-03

Features

  • Linux Perf Events profiling: CPU cycles, cache misses, branch misses, page faults, context switches etc.
  • Kernel tracepoints support
  • Contended monitor (aka intrinsic lock) profiling
  • Individual thread profiles

Improvements

  • Profiler can engage at JVM start and automatically dump results on exit
  • list command-line option to list supported events
  • Automatically find target process ID with jps tool
  • An option to include counter value in collapsed output
  • Friendly class names in allocation profile
  • Split allocations in new TLAB vs. outside TLAB

Changes

  • Replaced -m modes with -e events
  • Interval changed from int to long

[1.0] - 2017-10-09

Features

  • CPU profiler without Safepoint bias
  • Lightweight Allocation profiler
  • Java, native and kernel stack traces
  • FlameGraph compatible output