async-profiler/CHANGELOG.md

Changelog

[1.7-ea] - In development

Features

• Profile invocations of an arbitrary Java method
• --cstack option to collect native stack traces for Java-level events

Improvements

• 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