优化日循环对象查找并加入 profiling 工具

2026-08-29 18:51:20 +08:00
parent 70d72d5d02
commit 82fec0ff10
4 changed files with 240 additions and 14 deletions
@@ -0,0 +1,97 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+usage() {
+  cat <<'EOF'
+Usage: profile-daily-loop.sh --pid PID [--seconds N] [--output-dir DIR] [--flamegraph-dir DIR]
+
+Attaches perf to an existing FIDC runner process. It never starts, stops, or
+restarts a service. The allocation report is a CPU-sample proxy for allocator
+pressure; it is not an allocation count or byte-accurate heap profile.
+EOF
+}
+
+pid=""
+seconds=15
+output_dir=""
+flamegraph_dir=""
+
+while [[ $# -gt 0 ]]; do
+  case "$1" in
+    --pid)
+      pid="${2:-}"
+      shift 2
+      ;;
+    --seconds)
+      seconds="${2:-}"
+      shift 2
+      ;;
+    --output-dir)
+      output_dir="${2:-}"
+      shift 2
+      ;;
+    --flamegraph-dir)
+      flamegraph_dir="${2:-}"
+      shift 2
+      ;;
+    -h|--help)
+      usage
+      exit 0
+      ;;
+    *)
+      echo "unknown argument: $1" >&2
+      usage >&2
+      exit 2
+      ;;
+  esac
+done
+
+if [[ "${EUID}" -ne 0 ]]; then
+  echo "run as root so perf can attach to the runner" >&2
+  exit 2
+fi
+if [[ ! "${pid}" =~ ^[1-9][0-9]*$ ]]; then
+  echo "--pid must be a positive process id" >&2
+  exit 2
+fi
+if [[ ! "${seconds}" =~ ^[1-9][0-9]*$ ]]; then
+  echo "--seconds must be a positive integer" >&2
+  exit 2
+fi
+if ! kill -0 "${pid}" 2>/dev/null; then
+  echo "process is not running: ${pid}" >&2
+  exit 1
+fi
+if ! command -v perf >/dev/null 2>&1; then
+  echo "perf is required" >&2
+  exit 2
+fi
+
+if [[ -z "${output_dir}" ]]; then
+  output_dir="$(pwd)/profile-$(date +%Y%m%d-%H%M%S)-${pid}"
+fi
+mkdir -p "${output_dir}"
+
+perf record --quiet --call-graph dwarf -g -e cycles:P -p "${pid}" \
+  -o "${output_dir}/perf.data" -- sleep "${seconds}"
+perf report --stdio --no-children --sort symbol --percent-limit 0.5 \
+  -i "${output_dir}/perf.data" > "${output_dir}/perf-report.txt"
+
+grep -E 'malloc|calloc|realloc|free|cfree|drop_glue' "${output_dir}/perf-report.txt" \
+  > "${output_dir}/allocation-samples.txt" || true
+
+if [[ -n "${flamegraph_dir}" ]]; then
+  if [[ ! -x "${flamegraph_dir}/stackcollapse-perf.pl" || ! -x "${flamegraph_dir}/flamegraph.pl" ]]; then
+    echo "flamegraph tools not found under ${flamegraph_dir}" >&2
+    exit 2
+  fi
+  perf script -i "${output_dir}/perf.data" > "${output_dir}/perf.script"
+  "${flamegraph_dir}/stackcollapse-perf.pl" "${output_dir}/perf.script" \
+    > "${output_dir}/daily-loop.folded"
+  "${flamegraph_dir}/flamegraph.pl" \
+    --title="FIDC engine daily loop CPU samples" \
+    "${output_dir}/daily-loop.folded" > "${output_dir}/daily-loop-flamegraph.svg"
+fi
+
+printf '%s\n' "profile complete: ${output_dir}"