ActivityManagerPerfTests
Performance tests for various ActivityManager components, e.g. Services, Broadcasts
* These are only for tests that don't require a target package to test against
* Self-contained perf tests should go in frameworks/base/apct-tests/perftests
Command to run tests
* atest -v ActivityManagerPerfTests
Overview
* The numbers we are trying to measure are end-to-end numbers
* For example, the time it takes from sending an Intent to start a Service
to the time the Service runs its callbacks
* System.nanoTime() is monotonic and consistent between processes, so we use that for measuring time
* If the test app is involved, it will measure the time and send it back to the instrumentation test
* The time is sent back through a Binder interface in the Intent with the help of Utils.sendTime()
* Each sent time is tagged with an id since there can be multiple events that send back a time
* Each test will run multiple times to account for variation in test runs
Structure
* tests
* Instrumentation test which runs the various performance tests and reports the results
* test-app
* Target package which contains the Services, BroadcastReceivers, etc. to test against
* Sends the time it measures back to the test package
* utils
* Utilities that both the instrumentation test and test app can use
Adding tests
* Example
* Look at tests/src/com/android/frameworks/perftests/am/BroadcastPerfTest and
test-app/src/com/android/frameworks/perftests/amteststestapp/TestBroadcastReceiver
for simple examples using this framework
* Steps
* Add any components you will test against in the target package under
test-app/src/com/android/frameworks/perftests/amteststestapp/
* Add the test class under tests/src/com/android/frameworks/perftests/am/tests/
* The class should extend BasePerfTest
* Each test should call runPerfFunction() returning the elapsed time for a single iteration
* The test has access to a Context through mContext
* If you are measuring the time elapsed of something that either starts or ends in the target
package
* The target package can report the time it measures through an ITimeReceiverCallback passed
through an Intent through Utils.sendTime(intent, "tag")
(or however a Binder needs to be passed to the target package)
* The instrumentation test can collect that time by calling getReceivedTimeNs("tag") and
calculate the elapsed time
* Each timestamp sent to the instrumentation test is tagged with a tag since multiple timestamps
can be reported in an iteration
* If the target package should be running before your test logic starts, add startTargetPackage();
at the beginning of the iteration
* Reporting
* Look at internal documentation for how to add new tests to dashboards and receive notification
on regressions
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