USDT Python Tracing 範例

 Reference for USDT Tracepoint for Python

https://github.com/paulross/dtrace-py

https://www.collabora.com/news-and-blog/blog/2019/05/14/an-ebpf-overview-part-5-tracing-user-processes/

https://github.com/iovisor/bcc/pull/698

Install build tools and python prerequisites

sudo apt install systemtap-sdt-dev

sudo apt install build-essential libssl-dev zlib1g-dev libncurses5-dev libncursesw5-dev libreadline-dev libsqlite3-dev libgdbm-dev libdb5.3-dev libbz2-dev libexpat1-dev liblzma-dev tk-dev libffi-dev

Download and extract python

wget https://www.python.org/ftp/python/3.7.0/Python-3.7.0.tar.xz

tar xf Python-3.7.0.tar.xz

cd Python-3.7.0

curl -o Python-3.7.0.tgz https://www.python.org/ftp/python/3.7.0/Python-3.7.0.tgz

tar -xzf Python-3.7.0.tgz

cd Python-3.7.0

Build python

./configure --with-dtrace --enable-optimizations

make -j 8

# altinstall does not alter original system python install

sudo make altinstall

Run python3.7 when you type python3 ( update-alternatives )

sudo update-alternatives --install /usr/bin/python3 python3 /usr/local/bin/python3.7 1

sudo update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.6 2

sudo update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.8 1

Run below and select python3.7 from the list

sudo update-alternatives --config python3

or create a shortcut

sudo ln -s /usr/local/bin/python3.7 /usr/bin/py

Example:

~/git/ebpfKit/Examples/python$ python main3.py

~/git/bcc/tools/lib$ sudo ./uflow.py -M func -l python `pgrep python`

Tracing method calls in python process 5640... Ctrl-C to quit.

CPU PID TID TIME(us) METHOD

0 5640 5650 8.361 -> main3.py.func_danny

0 5640 5650 8.361 <- main3.py.func_danny

1 5640 5651 8.366 -> main3.py.func_danny

1 5640 5651 8.366 <- main3.py.func_danny

0 5640 5650 18.371 -> main3.py.func_danny

0 5640 5650 18.371 <- main3.py.func_danny

1 5640 5651 18.376 -> main3.py.func_danny

1 5640 5651 18.376 <- main3.py.func_danny

0 5640 5650 28.400 -> main3.py.func_danny

0 5640 5650 28.400 <- main3.py.func_danny

3 5640 5651 28.405 -> main3.py.func_danny

3 5640 5651 28.405 <- main3.py.func_danny

0 5640 5650 38.415 -> main3.py.func_danny

0 5640 5650 38.415 <- main3.py.func_danny

3 5640 5651 38.415 -> main3.py.func_danny

3 5640 5651 38.415 <- main3.py.func_danny

^Cliudanny@52-A90058-03:~/git/bcc/tools/lib$ sudo ./uflow.py -M put -l python `pgrep python3`

Tracing method calls in python process 3807... Ctrl-C to quit.

CPU PID TID TIME(us) METHOD

2 3807 3815 2.884 -> /usr/local/lib/python3.7/queue.py.put

2 3807 3815 2.884 <- /usr/local/lib/python3.7/queue.py.put

0 3807 3816 2.885 -> /usr/local/lib/python3.7/queue.py.put

0 3807 3816 2.885 <- /usr/local/lib/python3.7/queue.py.put

3 3807 3817 2.885 -> /usr/local/lib/python3.7/queue.py.put

3 3807 3817 2.885 <- /usr/local/lib/python3.7/queue.py.put

1 3807 3818 2.886 -> /usr/local/lib/python3.7/queue.py.put

1 3807 3818 2.886 <- /usr/local/lib/python3.7/queue.py.put