第43讲 Perfetto 自动化之Camera前后切换性能自动化分析

本讲是Android Camera性能分析专题的第43讲，我们介Perfetto 自动化之Camera前后切换性能自动化分析。

更多资源：

Camera前后摄切换性能拆解

Camera前后摄切换性能自动化分析代码

代码见视频讲解

#!/usr/bin/env python3
from perfetto.trace_processor import TraceProcessor
from perfetto.trace_processor import TraceProcessorConfig

tp = TraceProcessor(trace=r'switch_camera.perfetto-trace', config=TraceProcessorConfig(
    bin_path=r'trace_processor_shell_v3.7.exe',
    verbose=False))

### Click switch camera icon
click_app_icon = tp.query('SELECT (slice.ts+slice.dur)/1e6 '
                          'FROM slice '
                          'WHERE ts <(SELECT ts FROM slice WHERE name == "connectDevice" LIMIT 1) '
                          'AND name like "%deliverInputEvent%" '
                          'ORDER BY ts DESC '
                          'LIMIT 1')
click_app_icon_ms = click_app_icon.as_pandas_dataframe().values[0][0]

### closCamera
closecamera_sql = """SELECT ts/1e6, dur/1e6 FROM
                slice
                JOIN thread_track ON slice.track_id = thread_track.id
                JOIN thread USING(utid)
                JOIN process USING(upid)
                WHERE slice.name='disconnectImpl' AND process.name='/system/bin/cameraserver'
                LIMIT 1"""
close_camera_df = tp.query(closecamera_sql).as_pandas_dataframe()
close_camera_begin = close_camera_df.values[0][0]
close_camera_dur = close_camera_df.values[0][1]

### openCamera
open_session = tp.query('SELECT (slice.ts/1e6), (slice.dur/1e6) '
                        'FROM slice '
                        'WHERE slice.name like "%CameraHal::openSession%"')
open_session_df = open_session.as_pandas_dataframe()
open_session_begin_ms = open_session_df.values[0][0]
open_session_duration_ms = open_session_df.values[0][1]

### beginConfigure
begin_configure = tp.query('SELECT (slice.ts/1e6) '
                          'FROM slice '
                          'WHERE slice.name like "%beginConfigure%" '
                          'LIMIT 1')
begin_configure_df = begin_configure.as_pandas_dataframe()
begin_configure_ms = begin_configure_df.values[0][0]

### endConfigure
end_configure = tp.query('SELECT (slice.ts/1e6), (slice.dur/1e6) '
                          'FROM slice '
                          'WHERE slice.name like "%endConfigure%" '
                          'LIMIT 1')
end_configure_df = end_configure.as_pandas_dataframe()
end_configure_begin_ms = end_configure_df.values[0][0]
end_configure_duration_ms = end_configure_df.values[0][1]

### submitRequestList
submit_request_list = tp.query('SELECT (slice.ts/1e6) '
                          'FROM slice '
                          'WHERE ts >(SELECT ts FROM slice WHERE name == "endConfigure" LIMIT 1) '
                          'AND slice.name like "%submitRequestList%" '
                          'ORDER BY slice.ts ASC '
                          'LIMIT 1')
submit_request_list_df = submit_request_list.as_pandas_dataframe()
submit_request_list_begin_ms = submit_request_list_df.values[0][0]

### CameraServer queue first frame
first_full_buffer = tp.query('SELECT (slice.ts/1e6), (slice.dur/1e6) '
                        'FROM slice '
                        'WHERE slice.name like "%first full buffer%"')
first_full_buffer_df = first_full_buffer.as_pandas_dataframe()
first_full_buffer_queued_ms = first_full_buffer_df.values[0][0] + first_full_buffer_df.values[0][1]

### print results
print("Total Switch Camera time:" + str(round((first_full_buffer_queued_ms - click_app_icon_ms), 2)) + " ms, break down as following:")
print("    [App] Click                     -->                  closCamera: " +
      str(round((close_camera_begin - click_app_icon_ms), 2)) + " ms")
print("    [HAL]                           -->                  closCamera: " +
      str(round((close_camera_dur), 2)) + " ms")
print("    [App] closCamera                -->      CameraHal::openSession: " +
      str(round((open_session_begin_ms - close_camera_begin - close_camera_dur), 2)) + " ms")
print("    [HAL]                                    CameraHal::openSession: " +
      str(round((open_session_duration_ms), 2)) + " ms")
print("    [App] CameraHal::openSession    -->              beginConfigure: " +
      str(round((begin_configure_ms - open_session_duration_ms - open_session_begin_ms), 2)) + " ms")
print("    [HAL] beginConfigure            -->                endConfigure: " +
      str(round((end_configure_begin_ms + end_configure_duration_ms - begin_configure_ms), 2)) + " ms")
print("    [App] endConfigure              -->           submitRequestList: " +
      str(round((submit_request_list_begin_ms - end_configure_begin_ms - end_configure_duration_ms), 2)) + " ms")
print("    [HAL] submitRequestList         --> Stream x: first full buffer: " +
      str(round((first_full_buffer_queued_ms - submit_request_list_begin_ms), 2)) + " ms")

输出

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