Greg Pomerantz
d38dcd3495
One-shot: install release APK, verify thread priorities (thumb-* nice 2, slint vsync nice 0), then two 30 s user-scroll windows — real textures vs grey 1x1 images — with SCRDBG cadence analysis (on-grid %, stalls, p95, worst). Decisive fork: real-janky+grey-smooth -> texture/GPU path; both janky -> base render/present path; both smooth -> priority fix worked. Dry-run tested on the emulator (grey knob detection, priority readback).
86 lines
3.2 KiB
Bash
Executable File
86 lines
3.2 KiB
Bash
Executable File
#!/usr/bin/env bash
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# One-shot jank A/B for the phone (usage: ADB_SERIAL=10.0.0.5:5555 ./scripts/jank_ab.sh)
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#
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# What it does:
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# 1. Installs the release APK (build with ./scripts/build.sh aarch64 first).
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# 2. Verifies thread priorities (thumb-* at nice 2, slint vsync at 0).
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# 3. Runs TWO 30-second scroll windows — real textures, then grey 1x1
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# images — with logcat capture + cadence analysis in between.
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# THE USER MUST SCROLL WITH A FINGER during each window
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# (moderate drag, no fling — the reported repro).
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# 4. Prints a comparison: % of scroll events on the 8.3 ms grid,
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# stall count (gap > 16 ms), worst gaps.
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#
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# Interpretation:
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# real janky + grey smooth -> texture/GPU path is the culprit
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# both janky -> base render/present/event path
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# both smooth -> the priority fix worked; ship it
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set -u
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E="adb ${ADB_SERIAL:+-s $ADB_SERIAL}"
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APK=target/release/apk/gallery.apk
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PKG=wow.gmp.gallery
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CMD=/sdcard/Download/.gallery_cmd
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GREY=/sdcard/Download/.gallery_grey
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[ -f "$APK" ] || { echo "build first: ./scripts/build.sh aarch64"; exit 1; }
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scroll_window() { # $1 = label, $2 = tag, $3 = seconds
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local out="/tmp/jank_$2.txt"
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$E logcat -c
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echo "### $1 — scroll now (moderate drag, no fling)..."
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$E logcat 2>/dev/null | grep -m 2000 "SCRDBG\|TICK \|APLY \|raised\|not found\|panic" > "$out" &
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local LP=$!
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sleep "$3"
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kill "$LP" 2>/dev/null
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python3 - "$out" << 'EOF'
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import re, sys
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ev = []
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for line in open(sys.argv[1], errors="ignore"):
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m = re.search(r"SCRDBG Instant \{ tv_sec: (\d+), tv_nsec: (\d+) \}", line)
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if m: ev.append(int(m.group(1))*1000 + int(m.group(2))/1e6)
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if len(ev) < 10:
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print(f" {sys.argv[1]}: only {len(ev)} scroll events — not enough data"); sys.exit()
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gaps = [ev[i+1]-ev[i] for i in range(len(ev)-1)]
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on_grid = sum(1 for g in gaps if 7.5 <= g <= 10.5)
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stalls = [g for g in gaps if g > 16]
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print(f" events={len(ev)} on 8.3ms grid={100*on_grid/len(gaps):.0f}% "
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f"stalls(>16ms)={len(stalls)} p95={sorted(gaps)[int(len(gaps)*0.95)]:.1f}ms "
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f"worst={max(gaps):.1f}ms")
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EOF
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}
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check_prios() {
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local pid; pid=$($E shell pidof $PKG)
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echo "### thread priorities (pid $pid)"
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$E shell "for t in /proc/$pid/task/*; do c=\$(cat \$t/comm 2>/dev/null); case \$c in slint*|thumb*) n=\$(awk -F')' '{print \$2}' \$t/stat | awk '{print \$17}'); echo \" \$c nice=\$n\";; esac; done"
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}
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install_and_start() { # $1 = "grey" to enable the grey knob before launch
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$E install -r "$APK" >/dev/null
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if [ "$1" = grey ]; then $E shell "touch $GREY"; else $E shell "rm -f $GREY"; fi
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$E shell am force-stop $PKG
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$E shell am start -n $PKG/android.app.NativeActivity >/dev/null
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sleep 8
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}
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echo "=== installing $APK ==="
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install_and_start
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check_prios
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echo
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echo "=== window 1: REAL textures (30 s) ==="
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scroll_window "real" real 30
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echo
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echo "=== restarting with grey 1x1 images ==="
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install_and_start grey
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check_prios
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echo
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echo "=== window 2: GREY images (30 s) ==="
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$E logcat -d 2>/dev/null | grep "grey images ON" || echo " WARNING: grey knob not active!"
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scroll_window "grey" grey 30
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$E shell "rm -f $GREY $CMD"
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echo
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echo "done. Compare the two summaries above."
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echo " (raw captures: /tmp/jank_real.txt /tmp/jank_grey.txt)"
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