74194e660a
Add v4 sweep results and post-mortem analysis showing:
- direct-to-D path: 54.3% (1P7D) / 58.0% (2P6D) of requests now use
KVC cleanly. P50=0.5s and TTFT P50=0.043s; this path beats baseline
8DP across the board (P50 -24%, TTFT P50 -54%, TTFT P90 -79%).
- Overall vs baseline (errors+truncated excluded):
v4 2P6D P50=0.85s vs baseline 0.66s (28% slower).
Reason is not errors -- 35% of requests still hit
fallback-large-append-session-cap, where capacity-based
cap = usable_tokens / target_tokens evaluates to 1-2 (not 16)
for large agentic inputs.
- 9-10% errors on KVC variants are mooncake TCP transfer timeouts,
not SGLang logic bugs. Prefill log shows
"Failed to send kv chunk ... 32s timeout ... session not alive".
Errors concentrate in turn>=31 (large inputs) after run >44.8%.
Track:
- docs/KVC_DEBUG_JOURNEY_V1_TO_V4.md: append v4 results table,
per-mode breakdown, and error root cause.
- scripts/analysis/{analyze_v3,analyze_v4,analyze_errors,compare_no_error}.py
- outputs/qwen3-30b-tp1-v{3,4}*/exp*_summary.json (force-added,
small JSON; metrics.jsonl excluded due to size).
- outputs/qwen3-30b-tp1-v{3,4}*/sweep_results.txt
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
85 lines
2.2 KiB
JSON
85 lines
2.2 KiB
JSON
{
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"actual_output_tokens_stats": {
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"count": 4440.0,
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"mean": 225.87972972972972,
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"p50": 86.0,
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"p90": 576.0,
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"p99": 1347.0
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},
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"cache_hit_request_count": 4201,
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"cached_tokens_stats": {
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"count": 4449.0,
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"mean": 24345.55787817487,
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"p50": 21504.0,
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"p90": 48792.0,
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"p99": 69120.0
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},
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"decode_request_priorities": {},
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"error_count": 9,
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"execution_modes": {
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"kvcache-centric": 9,
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"kvcache-direct-to-d-session": 1358,
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"pd-router-d-session-reseed": 12,
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"pd-router-fallback-d-backpressure": 2,
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"pd-router-fallback-large-append-seed-filter-early-turn": 52,
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"pd-router-fallback-large-append-session-cap": 2902,
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"pd-router-fallback-session-cap": 25,
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"pd-router-large-append-reseed": 34,
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"pd-router-large-append-reseed-after-eviction": 4,
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"pd-router-turn1-d-backpressure": 1,
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"pd-router-turn1-seed": 30,
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"pd-router-turn1-session-cap": 20
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},
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"latency_stats_s": {
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"count": 4440.0,
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"mean": 3.582334662846558,
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"p50": 1.517257746309042,
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"p90": 9.225348330102861,
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"p99": 18.70269925892353
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},
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"mechanisms": {
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"kvcache-centric": 4449
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},
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"per_decode_load": {
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"decode-0": 710,
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"decode-1": 630,
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"decode-2": 763,
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"decode-3": 737,
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"decode-4": 879,
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"decode-5": 730
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},
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"per_prefill_load": {
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"prefill-0": 2225,
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"prefill-1": 2224
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},
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"prefill_request_priorities": {
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"-100": 80,
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"100": 3002
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},
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"re_prefill_count": 0,
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"request_count": 4449,
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"reuse_expected_count": 4397,
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"reuse_observed_count": 4397,
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"router_url": "http://127.0.0.1:8000",
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"session_reset_count": 0,
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"session_reused_count": 1358,
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"total_actual_kv_transfer_blocks": 78979,
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"total_cached_tokens": 108313387,
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"total_kv_transfer_blocks": 105235,
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"tpot_stats_s": {
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"count": 4440.0,
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"mean": 0.005882534704321737,
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"p50": 0.005807478777200416,
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"p90": 0.00712956755887717,
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"p99": 0.008372141476720572
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},
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"trace_path": "outputs/qwen3-30b-tp1-v3-kvaware/kvcache-centric-kv-aware-worker-admission-20260428T104343Z/sampled-trace.jsonl",
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"truncated_request_count": 42,
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"ttft_stats_s": {
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"count": 4440.0,
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"mean": 2.2045287611873334,
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"p50": 0.32809355948120356,
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"p90": 6.947275545448065,
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"p99": 16.705802395939827
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}
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} |