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PyPI · #4209 most downloaded on PyPI
Austin - Frame Stack Sampler for CPython
Last release 11 months ago
01 Nov 2025
Ships on a steady schedule
a new release about every 13 months
Nearly every release is documented
notes for 5 of 5 stable releases
Nothing withdrawn
no release was ever pulled
4 years old
5 releases · first in 2023
One column per quarter.
Added support for CPython 3.14.
Added support for CPython 3.14.
Dropped support for CPython 3.8.
The MOJO binary output format is now the default. The augmented collapsed stack format is no longer supported.
The --sleepless/-s option has been replaced with the --cpu/-c option.
Removed the heap option.
Improved accuracy and performance by more than doubling the maximum attainable sampling rate.
Added support for the exec system call.
Fixed a bug that caused Austin to fail to attach to a MacOS process for a second time with CPython 3.13.
Fixed a bug that caused the sampling to halt if Austin failed to retrieve valid thread information.
Added support for CPython 3.13.
Added support for CPython 3.13.
Improve support for Python processes running in containers.
Removed the exclude-empty option.
Dropped support for CPython 2, 3.3, 3.4, 3.5, 3.6 and 3.7.
Support for CPython 3.12
Support for sub-interpreters.
Dropped support for CPython 2, 3.3, 3.4, 3.5, 3.6 and 3.7.
Improved interpreter detection and general stability on all supported platforms.
Ensure that threads are resumed by austinp when an error occurs during the sampling process.
Propagate the termination signal to the child process when launching a command with Austin to prevent it from running indefinitely in the background.
Added support for CPython 3.12
Added support for sub-interpreters.
Dropped support for CPython 2, 3.3, 3.4, 3.5, 3.6 and 3.7.
Improved interpreter detection and general stability on all supported platforms.
Bugfix: ensure that threads are resumed by austinp when an error occurs during the sampling process.
Bugfix: propagate the termination signal to the child process when launching a command with Austin to prevent it from running indefinitely in the background.
Added support for fine-grained, column-level location information when exporting samples in binary mode.
Added support for fine-grained, column-level location information when exporting samples in binary mode.
Improved multiprocess support.
Dropped the alternative output format.
Improved interpreter detection on all supported platforms.
Fixed a bug with the MOJO binary format.
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