Maintenance release

v1.8.1

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

Converters

v1.8

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

LBR call stack support

v1.7.1

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

Method invocation profiling. Filters

v1.7

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

Usability and reliability improvements

v1.6

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

Wall-clock and timer-based profiling

v1.5

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

Tree view and JFR compatible output

v1.4

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

Native functions profiling and JDK 10 support

v1.3

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

Built-in SVG generator

v1.2

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)

Perf Events support

v1.1

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