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Make the search benchmark start from a known screen, so all four measure

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The failure was not the app bar at all. Dumping the hierarchy at the point of failure showed a TextView whose text was 'Search this folder' and a desc='Clear search' beside it: the app was already in search mode, because the previous iteration left it there and CompilationMode.Ignore() reinstalls nothing between iterations. So the setup found a search field where it expected an action. openFixture now calls killProcess() before each iteration, and the test writes search-action-missing.xml into its external files directory when the action is missing, which is what turned this from a guess into a diagnosis.

With that, one run gives OK (4 tests): coldStart 531.6 ms median (475.6-552.0), opening a 1000-file folder 12 frames (12-17), scrolling it with four swipes 97 frames (92-100), and typing into search 39 frames (36-40). The run before it, same method, gave 519.5 ms / 14 / 94 / 38, so the numbers repeat. PERFORMANCE.md now carries both runs side by side and only lists what is genuinely still missing: larger folders, the photo grid, and any jank figure at all, since this phone reports frame counts and no frame durations.
This commit is contained in:
Hadrian Burkhardt
2026-10-17 15:58:03 +02:00
parent 7514676384
commit cbb36abfce
3 changed files with 52 additions and 28 deletions
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docs/PERFORMANCE.md
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@@ -18,11 +18,11 @@ Until this file existed, the app had **no performance number of any kind**.
The first is `./tools/measure-startup.sh 5` (`am start -W`, one warm-up start discarded because the first
launch after an install pays for dexopt). The second is `BrowserBenchmark#coldStart` in the `:benchmark`
module: `StartupTimingMetric`, five iterations, `CompilationMode.None()`, measured as time to initial
display — min 499 ms, median 532 ms, max 805 ms. Measured five times, on four different runs: 615 ms
display — min 499 ms, median 532 ms, max 805 ms. Measured six times, on five different runs: 615 ms
before the storage grant was in place (the app was showing the permission screen), 532 ms after it, 560 ms
(min 539, max 698), 574 ms (min 554, max 730), and 519.5 ms (min 503.6, max 544.7) on the first run that
used `CompilationMode.Ignore()`. They agree within a phone's patience; the 532 ms figure above is the middle
one, and the later runs are the ones whose method is worth copying.
(min 539, max 698), 574 ms (min 554, max 730), 519.5 ms (min 503.6, max 544.7) and 531.6 ms (min 475.6,
max 552.0) — the last two on the runs that used `CompilationMode.Ignore()` and measured all four
benchmarks. They agree within a phone's patience; the 532 ms figure above is the middle one.
Two caveats belong to that number rather than to a footnote. The tool itself warns *"Unable to clear
Runtime Image, subsequent launches/iterations may exhibit faster startup than production due to
@@ -77,15 +77,18 @@ needs the same module.
### What the module has measured
The run that first completed all four tests (MIUI's install dialog answered by
`tools/benchmark-watch-install.sh`, 5 iterations each, `CompilationMode.None()`):
The two runs that completed all four tests — same APK, `CompilationMode.Ignore()`, 5 iterations each, no
install during either run:
| benchmark | result | what it is |
|---|---|---|
| `coldStart` | **519.5 ms** median (min 503.6, max 544.7) | time to initial display — the fifth measurement of the same thing, alongside 615 / 532 / 560 / 574 ms |
| `openAFolderOfAThousandFiles` | **14 frames** median (min 11, max 17) | frames drawn from the folder tap until `file-0.txt` is on screen |
| `scrollAFolderOfAThousandFiles` | **94 frames** median (min 48, max 96) | frames drawn across four swipes through the folder |
| `searchInsideAFolderOfAThousandFiles` | **failed** | the app bar's search action is not in the accessibility tree within 20 s of the folder opening, although the same taps by hand find it immediately |
| benchmark | run 1 | run 2 | what it is |
|---|---|---|---|
| `coldStart` | **519.5 ms** (503.6–544.7) | **531.6 ms** (475.6–552.0) | time to initial display |
| `openAFolderOfAThousandFiles` | **14 frames** (11–17) | **12 frames** (12–17) | frames from the folder tap until `file-0.txt` is on screen |
| `scrollAFolderOfAThousandFiles` | **94 frames** (48–96) | **97 frames** (92–100) | frames across four swipes through the folder |
| `searchInsideAFolderOfAThousandFiles` | **38 frames** (33–44) | **39 frames** (36–40) | frames from opening search until `file-99.txt` is the result |
The two runs agree closely, which is the point of running them twice: the method is stable enough that a
change in the app would show up as a change in these numbers rather than as noise.
**Those frame counts are not a jank metric, and the difference matters.** `FrameTimingMetric` normally
publishes `frameDurationCpuMs` and `frameOverrunMs` — how long each frame took and how far past its
@@ -95,10 +98,15 @@ lasted. It says the interaction is short (14 frames is about a quarter of a seco
say whether any of those frames was slow. A device that reports frame durations — an emulator or any
non-MIUI phone — is what turns this into a jank number.
Two notes on provenance. The results JSON from that run was deleted by the next run's cleanup before it
could be copied a second time, so the figures above come from parsing it once, immediately after the run;
re-running on a device without an install gate is the way to confirm them. And the run still ends with a
failing `search` test, so its number is missing rather than zero.
One bug had to be fixed before `search` could be measured, and it is worth knowing about because it looked
like a UI problem and was a state problem: the search iteration ends with search mode open, and with
`Ignore()` nothing reinstalls the app between iterations, so the *next* iteration found a search field
where it expected an app bar — the assertion fired every time. The hierarchy dump taken at the point of
failure showed a `TextView` whose *text* was "Search this folder" and a `desc='Clear search'` beside it:
the app was already searching. `openFixture` now calls `killProcess()` before every iteration, so each one
starts on the roots screen. The dump itself stays: on a missing action it writes
`search-action-missing.xml` into the test app's external files directory, which is what made this
diagnosable instead of a guess.
### The install moved out of the test — that is the fix
@@ -181,20 +189,18 @@ instrumentation output itself, and the per-test JSON and Perfetto traces are lef
`/sdcard/Android/media/de.softwareapp_hb.filemanager.benchmark/` — they used to be deleted with the test app
when a run ended, which is why the earlier numbers had to be copied mid-run.
## Not measured yet, and why
## Still not measured
| number | status |
|---|---|
| Folder open with 1 000 files | **14 frames** median — measured, but as a frame *count*, not a jank figure |
| Folder open with 5 000 / 20 000 files | not measured: the fixture script counts to 1 000 |
| Scrolling that folder | **94 frames** median over four swipes — again a frame count |
| Typing into search | **failed** in the automated run: the app bar's search action is not in the accessibility tree within 20 s of the folder opening, although the same taps by hand find it immediately |
| Thumbnail paint while scrolling a photo grid | not measured: no test for it yet, and no frame durations on this device |
| Thumbnail paint while scrolling a photo grid | not measured: no test for it yet |
| Any jank figure at all | not measurable here: this phone's `FrameTimingMetric` output is `frameCount` only, with no `frameDurationCpuMs` or `frameOverrunMs` |
What the interaction numbers need is a device that reports frame durations; what the *repeated* runs need
is a device that installs unattended. This phone gives neither, and the two are independent: a
non-MIUI phone or an emulator with the system language set to English would answer both, and the fixture
is a folder of empty files, so nothing device-specific is being measured.
What the interaction numbers still need is a device that reports frame durations — an emulator or any
non-MIUI phone would do, and the fixture is a folder of empty files, so nothing device-specific is being
measured. The install side is solved: `CompilationMode.Ignore()` plus installing from the host means a run
touches the package manager zero times.
## What is measured instead, meanwhile