iter1 phase3: archive helper scripts used during baseline measurement

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
2026-05-16 07:24:25 +00:00
parent b5fdb5e854
commit 6aef03df8d
5 changed files with 224 additions and 0 deletions
@@ -0,0 +1,63 @@
+#!/bin/bash
+# C1 + C2 + C6 instrumentation: per-codec decode with strace (ioctl) + lsof (fds) + dmesg before/after.
+# Decodes 30 frames into a tmp file to verify HW engagement; doesn't measure FPS.
+set -u
+OUT=$HOME/measurements/p3
+mkdir -p $OUT
+codecs=("h264:rkvdec:h264.mp4" "vp8:hantro:vp8.webm" "mpeg2:hantro:mpeg2.ts")
+
+# C6 pre: dmesg snapshot
+sudo dmesg --time-format=ctime > $OUT/dmesg.pre.txt
+
+for spec in "${codecs[@]}"; do
+  codec=${spec%%:*}; route=$(echo $spec | cut -d: -f2); ext=${spec##*:}
+  cf=$HOME/measurements/encoded/bbb_60s_720p.${ext}
+  log=$OUT/engage_${codec}
+  rm -f $log.{strace,lsof,stderr,nv12} 2>/dev/null
+
+  echo "=== $codec ($route) ===" | tee $log.summary
+
+  # Launch in background, track PID; lsof+strace alongside
+  LIBVA_DRIVER_NAME=v4l2_request strace -ff -o $log.strace -e trace=ioctl,openat \
+      ffmpeg -hide_banner -loglevel error \
+      -hwaccel vaapi -hwaccel_output_format vaapi \
+      -i "$cf" -vf "hwdownload,format=nv12" -frames:v 30 \
+      -f rawvideo -pix_fmt nv12 -y $log.nv12 \
+      > $log.stderr 2>&1 &
+  pid=$!
+
+  # Wait briefly then lsof
+  sleep 0.6
+  if kill -0 $pid 2>/dev/null; then
+    lsof -p $pid 2>/dev/null | grep -E "/dev/(video|media|dri)" > $log.lsof
+  fi
+  wait $pid; rc=$?
+
+  # Aggregate
+  size=$(stat -c%s $log.nv12 2>/dev/null || echo 0)
+  expected=$((30 * 1280 * 720 * 3 / 2))  # 30 frames yuv420p 720p
+  size_ok=$([ "$size" = "$expected" ] && echo "ok" || echo "MISMATCH (expected=$expected)")
+
+  vidioc=$(grep -h "VIDIOC_S_EXT_CTRLS\|VIDIOC_QUERYCAP\|VIDIOC_QBUF\|VIDIOC_DQBUF" $log.strace.* 2>/dev/null | wc -l)
+  media_q=$(grep -h "MEDIA_REQUEST_IOC_QUEUE\|MEDIA_REQUEST_IOC_REINIT" $log.strace.* 2>/dev/null | wc -l)
+  fd_count=$(wc -l < $log.lsof 2>/dev/null || echo 0)
+
+  {
+    echo "  rc=$rc  size=$size  size_ok=$size_ok"
+    echo "  ioctl V4L2 (S_EXT_CTRLS+Q/DQBUF+QUERYCAP)=$vidioc"
+    echo "  ioctl MEDIA_REQUEST_*=$media_q"
+    echo "  open V4L2/media/DRI fds=$fd_count"
+    if [ -s $log.lsof ]; then
+      echo "  fds:"
+      awk '{print "    " $9}' $log.lsof | sort -u
+    fi
+  } | tee -a $log.summary
+done
+
+# C6 post
+sudo dmesg --time-format=ctime > $OUT/dmesg.post.txt
+echo
+echo "=== dmesg diff (new lines since pre) ==="
+diff $OUT/dmesg.pre.txt $OUT/dmesg.post.txt | head -20
+
+echo "=== done $(date -Iseconds) ==="