systrace command invokes the Systrace tool,
which allows you to collect and inspect timing information across all processes
running on your device at the system level.
This document explains how to generate Systrace reports from the command line. On devices running Android 9 (API level 28) or higher, you can also generate Systrace reports using the System Tracing system app.
In order to run
systrace, complete the following steps:
- From Android Studio, download and install the latest Android SDK Tools.
- Install Python and include it in your
PATHenvironment variable. This directory contains the Android Debug Bridge binary (adb), which is called by the
- Connect a device running Android 4.3 (API level 18) or higher to your development system using a USB debugging connection.
systrace command is provided in the Android SDK Tools package and is
To generate the HTML report for app, you need to run
systrace from the
command line using the following syntax:
python systrace.py [options] [categories]
For example, the following command calls
systrace to record device activity
and generate a HTML report named
mynewtrace.html. This list of categories is a
reasonable default list for most devices.
$ python systrace.py -o mynewtrace.html sched freq idle am wm gfx view \
binder_driver hal dalvik camera input res memory
Tip: If you want to see the names of tasks in
the trace output, you must include the
sched category in
your command parameters.
To view the list of categories that your connected device supports, run the following command:
$ python systrace.py --list-categories
If you don't specify any categories or options,
systrace generates a report
that includes all available categories and uses default settings. The categories
available depend on the connected device you're using.
-h | --help
|Show the help message.
-l | --list-categories
|Lists the tracing categories available to your connected device.
Commands and command options
|Commands and options
|Write the HTML trace report to the specified file. If
you don't specify this option,
systrace saves your report to the same
systrace.py and names it
-t N | --time=N
|Trace device activity for N seconds. If you don't specify
systrace prompts you to end the trace by pressing the
Enter key from the command line.
-b N | --buf-size=N
|Use a trace buffer size of N kilobytes. This option lets you limit the total size of the data collected during a trace.
|Trace the activity of specific kernel functions, specified in a comma-separated list.
|Enable tracing for apps, specified as a comma-separated list of
The apps must contain tracing instrumentation calls from the
Trace class. You should specify this option whenever you
profile your app—many libraries, such as
RecyclerView, include tracing
instrumentation calls that provide useful information when you enable
app-level tracing. For more information, see Define custom events.
To trace all apps on a device running Android 9 (API level 28) or higher,
pass the wildcard character
|Create an interactive HTML report from a file, such as TXT files that include raw trace data, instead of running a live trace.
|Conduct the trace on a specific connected device, identified by its device serial number.
|Include tracing information for the system processes you specify, such
gfx for system processes that render graphics. You
systrace with the
-l command to see a
list of services available to your connected device.
Recommended for you
- Capture a system trace on a device