1da8754d45
**問題:**
- Larson 4T で 100% SEGV (1T は 2.09M ops/s で完走)
- System/mimalloc は 4T で 33.52M ops/s 正常動作
- SS OFF + Remote OFF でも 4T で SEGV
**根本原因: (Task agent ultrathink 調査結果)**
```
CRASH: mov (%r15),%r13
R15 = 0x6261 ← ASCII "ba" (ゴミ値、未初期化TLS)
```
Worker スレッドの TLS 変数が未初期化:
- `__thread void* g_tls_sll_head[TINY_NUM_CLASSES];` ← 初期化なし
- pthread_create() で生成されたスレッドでゼロ初期化されない
- NULL チェックが通過 (0x6261 != NULL) → dereference → SEGV
**修正内容:**
全 TLS 配列に明示的初期化子 `= {0}` を追加:
1. **core/hakmem_tiny.c:**
- `g_tls_sll_head[TINY_NUM_CLASSES] = {0}`
- `g_tls_sll_count[TINY_NUM_CLASSES] = {0}`
- `g_tls_live_ss[TINY_NUM_CLASSES] = {0}`
- `g_tls_bcur[TINY_NUM_CLASSES] = {0}`
- `g_tls_bend[TINY_NUM_CLASSES] = {0}`
2. **core/tiny_fastcache.c:**
- `g_tiny_fast_cache[TINY_FAST_CLASS_COUNT] = {0}`
- `g_tiny_fast_count[TINY_FAST_CLASS_COUNT] = {0}`
- `g_tiny_fast_free_head[TINY_FAST_CLASS_COUNT] = {0}`
- `g_tiny_fast_free_count[TINY_FAST_CLASS_COUNT] = {0}`
3. **core/hakmem_tiny_magazine.c:**
- `g_tls_mags[TINY_NUM_CLASSES] = {0}`
4. **core/tiny_sticky.c:**
- `g_tls_sticky_ss[TINY_NUM_CLASSES][TINY_STICKY_RING] = {0}`
- `g_tls_sticky_idx[TINY_NUM_CLASSES][TINY_STICKY_RING] = {0}`
- `g_tls_sticky_pos[TINY_NUM_CLASSES] = {0}`
**効果:**
```
Before: 1T: 2.09M ✅ | 4T: SEGV 💀
After: 1T: 2.41M ✅ | 4T: 4.19M ✅ (+15% 1T, SEGV解消)
```
**テスト:**
```bash
# 1 thread: 完走
./larson_hakmem 2 8 128 1024 1 12345 1
→ Throughput = 2,407,597 ops/s ✅
# 4 threads: 完走（以前は SEGV）
./larson_hakmem 2 8 128 1024 1 12345 4
→ Throughput = 4,192,155 ops/s ✅
```
**調査協力:** Task agent (ultrathink mode) による完璧な根本原因特定
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
97 lines
3.1 KiB
Bash
Executable File
97 lines
3.1 KiB
Bash
Executable File
#!/usr/bin/env bash
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set -euo pipefail
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# Defensive: ensure timeout exists; if not, best-effort shim
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if ! command -v timeout >/dev/null 2>&1; then
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echo "[warn] 'timeout' not found; runs may hang on bench bugs" >&2
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TIMEOUT() { "$@"; }
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else
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TIMEOUT() { timeout --kill-after=2s "$@"; }
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fi
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# Perf-annotated Larson runs for system/mimalloc/HAKMEM without LD_PRELOAD.
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# Writes results under scripts/bench_results/larson_perf_*.txt
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ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")"/.. && pwd)"
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cd "$ROOT_DIR"
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OUT_DIR="scripts/bench_results"
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mkdir -p "$OUT_DIR"
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dur=${DUR:-2}
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min=${MIN:-8}
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max=${MAX:-128}
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chunks=${CHUNKS:-1024}
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rounds=${ROUNDS:-1}
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seed=${SEED:-12345}
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threads_csv=${THREADS:-1,4}
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# Ensure builds
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[[ -x ./larson_system ]] || make -s larson_system >/dev/null
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MI_SO="${MIMALLOC_SO:-mimalloc-bench/extern/mi/out/release/libmimalloc.so}"
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have_mi=0
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if [[ -f "$MI_SO" ]]; then
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have_mi=1
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[[ -x ./larson_mi ]] || make -s larson_mi >/dev/null || have_mi=0
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fi
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[[ -x ./larson_hakmem ]] || make -s larson_hakmem >/dev/null
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IFS=',' read -ra ts <<<"$threads_csv"
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run_one() {
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local name=$1; shift
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local bin=$1; shift
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local thr=$1; shift
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local tag="${name}_${thr}T_${dur}s_${min}-${max}"
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local base="$OUT_DIR/larson_${tag}"
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local outfile="${base}.txt"
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local outlog="${base}.stdout"
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local errlog="${base}.stderr"
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: >"$outfile"; : >"$outlog"; : >"$errlog"
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echo "== $name threads=$thr ==" | tee -a "$outfile"
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# Warm-up quick run (avoid one-time inits skew). Always bounded by timeout.
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if [[ "$name" != "hakmem" ]]; then
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TIMEOUT "$((dur+2))"s "$bin" 1 "$min" "$max" "$chunks" "$rounds" "$seed" "$thr" \
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>>"$outlog" 2>>"$errlog" || true
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fi
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# Throughput run with timeout; capture both stdout/stderr to logs
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echo "[cmd] $bin $dur $min $max $chunks $rounds $seed $thr" | tee -a "$outfile"
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TIMEOUT "$((dur+3))"s "$bin" "$dur" "$min" "$max" "$chunks" "$rounds" "$seed" "$thr" \
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>>"$outlog" 2>>"$errlog" || true
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# Extract a single Throughput line from the captured stdout
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local tput_line
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if command -v rg >/dev/null 2>&1; then
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tput_line=$(rg -n "Throughput" -m 1 "$outlog" || true)
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else
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tput_line=$(grep -n "Throughput" "$outlog" | head -n1 || true)
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fi
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[[ -n "$tput_line" ]] && echo "$tput_line" | tee -a "$outfile" || echo "(no Throughput line)" | tee -a "$outfile"
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# perf stat (optional; if perf not present, skip gracefully)
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if command -v perf >/dev/null 2>&1; then
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TIMEOUT "$((dur+3))"s perf stat -o "$outfile" -a -d -d --append -- \
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"$bin" "$dur" "$min" "$max" "$chunks" "$rounds" "$seed" "$thr" \
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>>"$outlog" 2>>"$errlog" || true
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else
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echo "[warn] perf not found; skipping perf stat" | tee -a "$outfile"
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fi
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echo "[logs] stdout=$outlog stderr=$errlog" | tee -a "$outfile"
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}
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for t in "${ts[@]}"; do
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run_one system ./larson_system "$t"
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if (( have_mi == 1 )); then
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run_one mimalloc ./larson_mi "$t"
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fi
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HAKMEM_QUIET=1 HAKMEM_DISABLE_BATCH=1 HAKMEM_TINY_META_ALLOC=1 HAKMEM_TINY_META_FREE=1 \
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HAKMEM_TINY_USE_SUPERSLAB=${HAKMEM_TINY_USE_SUPERSLAB:-1} \
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HAKMEM_TINY_MUST_ADOPT=${HAKMEM_TINY_MUST_ADOPT:-1} \
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run_one hakmem ./larson_hakmem "$t"
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done
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echo "Written perf outputs under $OUT_DIR"
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