Quickstart: Record traces on Linux
Perfetto can capture system traces on Linux. All ftrace-based data sources and most other procfs / sysfs-based data sources are supported.
Currently there are no packages or prebuilts for Linux. In order to run Perfetto on Linux you need to build it from source.
Check out the code:
git clone https://android.googlesource.com/platform/external/perfetto/ && cd perfetto
Download and extract build dependencies:
If the script fails with SSL errors, try invoking it as
python3 tools/install-build-deps, or upgrading your openssl libraries.
Generate all most common GN build configurations:
Build the Linux tracing binaries (On Linux it uses a hermetic clang toolchain, downloaded as part of step 2):
tools/ninja -C out/linux_clang_release traced traced_probes perfetto
This step is optional when using the convenience
Due to Perfetto's service-based architecture,
in order to capture a trace, the
traced (session daemon) and
(probes and ftrace-interop daemon) need to be running.
For a quick start, the tools/tmux script takes care of building, setting up and running everything. As an example, let's look at the process scheduling data, which will be obtained from the Linux kernel via the [ftrace] interface. [ftrace]: https://www.kernel.org/doc/Documentation/trace/ftrace.txt
Run the convenience script with an example tracing config (10s duration):
OUT=out/linux_clang_release CONFIG=test/configs/scheduling.cfg tools/tmux -n
This will open a tmux window with three panes, one per the binary involved in tracing:
Start the tracing session by running the pre-filled
perfettocommand in the down-most [consumer] pane.
Detach from the tmux session with
Ctrl-B D,or shut it down with
tmux kill-session -t demo. The script will then copy the trace to
/tmp/trace.protobuf, as a binary-encoded protobuf (see TracePacket reference).
We can now explore the captured trace visually by using a dedicated web-based UI.
Navigate to ui.perfetto.dev in a browser.
Click the Open trace file on the left-hand menu, and load the captured trace (by default at
Explore the trace by zooming/panning using WASD, and mouse for expanding process tracks (rows) into their constituent thread tracks. Press "?" for further navigation controls.
Alternatively, you can explore the trace contents issuing SQL queries through the trace processor.