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fps: filter out bogus actual-present times and ignore janks above PAUSE_LATENCY

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The PAUSE_LATENCY thing is in line with what Google do inside
SurfaceFlingerHelper.
This commit is contained in:
Sergei Trofimov
2015-08-06 11:20:58 +01:00
parent 5e92728d77
commit 75e4b7d2ae
1 changed files with 6 additions and 3 deletions
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9
wlauto/instrumentation/fps/__init__.py
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@@ -41,6 +41,7 @@ except ImportError:
VSYNC_INTERVAL = 16666667
PAUSE_LATENCY = 20
EPSYLON = 0.0001
@@ -180,9 +181,11 @@ class FpsInstrument(Instrument):
result.status = IterationResult.FAILED
result.add_event('Content crash detected (actual/expected frames: {:.2}).'.format(ratio))
def _update_stats(self, context, data):
def _update_stats(self, context, data): # pylint: disable=too-many-locals
vsync_interval = self.collector.refresh_period
actual_present_time_deltas = (data.actual_present_time - data.actual_present_time.shift()).drop(0) # pylint: disable=E1103
# fiter out bogus frames.
actual_present_times = data.actual_present_time[data.actual_present_time != 0x7fffffffffffffff]
actual_present_time_deltas = (actual_present_times - actual_present_times.shift()).drop(0) # pylint: disable=E1103
vsyncs_to_compose = (actual_present_time_deltas / vsync_interval).apply(lambda x: int(round(x, 0)))
# drop values lower than drop_threshold FPS as real in-game frame
# rate is unlikely to drop below that (except on loading screens
@@ -204,7 +207,7 @@ class FpsInstrument(Instrument):
vtc_deltas = filtered_vsyncs_to_compose - filtered_vsyncs_to_compose.shift()
vtc_deltas.index = range(0, vtc_deltas.size)
vtc_deltas = vtc_deltas.drop(0).abs()
janks = vtc_deltas.apply(lambda x: (x > 1.5) and 1 or 0).sum()
janks = vtc_deltas.apply(lambda x: (PAUSE_LATENCY > x > 1.5) and 1 or 0).sum()
not_at_vsync = vsyncs_to_compose.apply(lambda x: (abs(x - 1.0) > EPSYLON) and 1 or 0).sum()
context.result.add_metric('janks', janks)
context.result.add_metric('not_at_vsync', not_at_vsync)