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PR Review: docs: fix hardcoded metrics mismatches and tutorial narrative gaps

• Read all changed files and compare with origin/main
• Review README.md changes
• Review getting-started docs (installation, quickstart, tutorial)
• Review guide docs (cluster, kv-cache, latency-models, routing, workloads)
• Post review feedback

Overall Assessment

Good PR — the core mission (updating stale metrics after the blackbox→roofline default switch) is well-executed. The measured metrics table in the PR description is helpful, and the tutorial rewrite with the 200 req/s scenario tells a much more compelling story than the old 20 req/s version. The added admonitions (HF fetch note, multi-JSON output, --rate semantics) address real user pain points.

Issues Found

1. cluster.md: All example excess rates are positive — no sub-saturation example (Minor)

docs/guide/cluster.md:59-63 — The old version showed a meaningful contrast: 4 instances were overloaded (excess=67.6) while 8 instances were barely queuing (excess=5.1). The new version at rate=500 has all three cases heavily overloaded:

4 instances:  excess = 108 req/s   → rapid queue growth
8 instances:  excess = 45.5 req/s  → heavy queueing
12 instances: excess = 24.7 req/s  → moderate queueing

None of these examples actually show the "sub-saturation" regime the next line references. The old version had 8 instances at excess=5.1 which was genuinely near equilibrium. Consider either: (a) adding a 4th line showing ~30 instances where excess goes negative, or (b) using a lower rate (e.g., rate=200) where 12 instances crosses the threshold (200/12 - 17 ≈ -0.3, essentially balanced). The "~8x" improvement claim also isn't self-evident from the numbers since both 4 and 8 instances are deeply overloaded — the reader can't verify it from the excess rates alone.

Fix this →

2. tutorial.md: Step 3 comment says "moderate headroom" for 8 instances, but body says it's overloaded (Minor)

docs/getting-started/tutorial.md:49 — The inline comment says # 8 instances (~136 req/s capacity → moderate headroom) but the explanation below (line 61) says TTFT p99 is ~60ms due to per-instance rate (25 req/s) exceeding single-request capacity. "Moderate headroom" suggests comfortable margin; the text describes near-saturation behavior. Consider changing to something like → still overloaded but manageable or → near capacity with batching.

Fix this →

3. tutorial.md: Capacity math in Step 3 comments could confuse readers (Nit)

docs/getting-started/tutorial.md:42-55 — The inline comments calculate capacity as 17 * N (e.g., ~68 req/s, ~136 req/s, ~204 req/s), but this is the throughput at saturation where continuous batching is fully engaged. A reader who ran Step 1 might think each instance can handle 17 independent req/s regardless of batching. The tutorial body correctly explains this nuance (lines 60-62), but the comments could be clearer — e.g., # 4 instances (saturated throughput ~68 req/s, needs 200).

4. quickstart.md: jq --slurp pipeline is fragile (Nit)

docs/getting-started/quickstart.md:67 — The suggested command ./blis run ... 2>/dev/null | tail -n +2 | jq --slurp '.[-1]' assumes the first line of stdout is the metrics header. If the output format changes (e.g., header removed or extra lines), tail -n +2 silently produces wrong results. Consider using jq -s with a filter on instance_id == "cluster" instead: jq --slurp '.[] | select(.instance_id == "cluster")' which is format-resilient.

5. README.md: "PP, EP" dropped from vLLM config feature line (Nit)

README.md:24 — Changed from (TP, PP, EP, batch limits) to (TP, chunk size, batch limits), dropping pipeline parallelism (PP) and expert parallelism (EP). If BLIS genuinely doesn't model PP/EP, this is correct. But if it does (even partially), mentioning them in the features list is useful for discoverability.

What Looks Good

• Tutorial narrative flow: The progression from "measure capacity under load" → "why batching matters" → "scale up" → "identify bottleneck" → "compare routing" is pedagogically sound. The new admonitions ("Why measure at high load?", "--rate is total arrival rate") preempt real FAQ questions.
• Honest routing claims: The old tutorial implied routing always makes a big difference; the new version correctly states routing differentiation needs heterogeneous workloads (tutorial.md:107). This is more accurate and avoids setting false expectations.
• Consistent HF_TOKEN messaging: The HF token note is now surfaced early in quickstart, installation, and README with consistent wording and a link to Llama-2 as the canonical gated model example.
• README structure improvements: Collapsing the directory tree behind <details> and splitting features into Core/Advanced are good UX improvements for the landing page.
• Guide metric fixes (kv-cache.md, routing.md, workloads.md, cluster.md): All single-line metric corrections look correct against the measured values in the PR description.

Summary

The PR achieves its stated goal of fixing stale metrics and improving the tutorial narrative. The issues above are all minor/nit — the only one worth addressing before merge is #1 (cluster.md excess rate examples) since it undermines the pedagogical point about sub-saturation. The rest are suggestions that could be addressed in follow-up.

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Addressed all review comments:

1. cluster.md excess rates — switched to rate=200 so the examples show a real transition: 4 instances (excess=33, overloaded) → 8 instances (excess=8, near saturation) → 12 instances (excess=-0.3, balanced/sub-saturation). The closing line now explains that TTFT converges to baseline when excess ≤ 0.

2. tutorial.md "moderate headroom" mismatch — rewrote all three inline comments to show per-instance arrival rate vs saturated capacity (e.g., 50 req/s per instance vs ~17 saturated capacity → heavily overloaded), consistent with the explanation below.

3. tutorial.md capacity math clarity — same fix as Init commit #2; comments now make it clear these are per-instance arrival rates compared against saturated throughput, not standalone capacity numbers.

4. quickstart.md jq pipeline — replaced fragile tail -n +2 | jq --slurp '.[-1]' with format-resilient jq --slurp '.[] | select(.instance_id == "cluster")'.

5. README.md PP/EP — no change needed. Confirmed BLIS has no --pp or --ep CLI flags (grepped cmd/), so the original (TP, PP, EP, batch limits) was aspirational. Current (TP, chunk size, batch limits) accurately reflects what BLIS models today.

@claude Are all the review comments addressed? See comment above: #632 (comment)

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Review comment verification

All 5 review comments have been addressed. Here's the verification:

• Fix Init commit #1: cluster.md excess rates — Switched to rate=200. Now shows a real transition: 4 instances (excess=33, overloaded) → 8 instances (excess=8, near saturation) → 12 instances (excess=-0.3, sub-saturation). Line 65 adds: "At sub-saturation (excess ≤ 0): TTFT converges to the baseline." ✅
• Fix Init commit #2: tutorial.md "moderate headroom" — All three inline comments rewritten to show per-instance arrival rate vs saturated capacity (e.g., 50 req/s per instance vs ~17 saturated capacity → heavily overloaded). No more "moderate headroom" mismatch. ✅
• Fix getting started instructions #3: tutorial.md capacity math clarity — Same fix as Init commit #2. Comments now clearly compare arrival rate against saturated throughput, not standalone capacity. ✅
• Fix Naming Conventions #4: quickstart.md jq pipeline — Replaced tail -n +2 | jq --slurp '.[-1]' with format-resilient jq --slurp '.[] | select(.instance_id == "cluster")'. ✅
• Fix Simplify kv cache (by removing matched variable) #5: README.md PP/EP — No change needed. Confirmed (TP, chunk size, batch limits) accurately reflects what BLIS models (no --pp or --ep flags exist). ✅

LGTM — all review feedback has been addressed and the changes look correct.