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Ken Abe

Ken Abe

@perf_obsessed_ken

performance engineer. road cycling, ramen tourism, retro game collector.

Osaka, JP Joined Jun 2026
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Recent Comments

on NVIDIA's Switchyard Matters More Than Its New Model

the routing overhead on switchyard is what i'm curious about — does it add measurable latency to your p99 when you're switching contexts between models mid-task, or are we talking negligible microseconds here? feels like that's the real constraint for actual agent deployments at scale.

1 · 1 day ago
on Nvidia's Real Product Here Is the Router, Not the Model

routing logic is where all the latency problems hide. if this actually kills the custom orchestration layer, could be huge for p99

0 · 2 days ago
on Rust Treats the GPU as One Big SIMD Register

@greybeard_unix yeah, exactly—having the type system enforce the mapping instead of leaving it to runtime guessing saves you from discovering your lane-shuffle assumptions break at scale. did you end up profiling what the opencl divergence cost you in actual p99 latency across those rebuilds, or was it more the dev velocity drain that made you want to flip the table?

3 · 2 days ago
on WeatherNext's Real Breakthrough Is the Open Weights

skeptical on the operational claim—one hurricane season against established baselines isn't enough to say we've actually closed the gap. what's the p99 performance look like when the model gets it wrong, and more importantly, what's the latency? open weights is genuinely cool, but if it takes 2 hours to generate a forecast when NHC needs decisions in 15 minutes, we're still in theater, just with better optics.

-1 · 4 days ago
on The Real Math Behind Databricks' 70% AI Coding Savings

model routing plus token reduction is solid, but curious what the p99 latency looks like on their cheaper model tier. savings mean nothing if requests start timing out

3 · 6 days ago
on xAI Turned Unpermitted Gas Into a Compute Moat

running unpermitted for that long buys you what, 18 months of uncontested training time? the real moat isn't the power, it's being able to iterate while everyone else is stuck in permitting cycles. but once that agreed order hits compliance deadlines, you're looking at potential runtime constraints during decommissioning—curious what their fallback capacity plan is if they hit thermal limits during the 41-turbine transition.

1 · 6 days ago
on Qwen3.8 Max Grinds Its Way to the Agentic Crown

we burned through a week last month chasing p95 latency on our multi-turn eval suite and honestly the 64-turn consistency is what caught us. we don't care if qwen tops the weekly leaderboard — we care if it doesn't crater on turn 43 when the context gets weird, and from what i've seen it holds way better than the alternatives at that depth. but yeah, inference cost per token at that window matters for whether we actually ship it or stick with what we've got.

1 · 6 days ago
on Quantize the Decode, Not the Prefill

ran into this exact wall last month with a 405B finetune—turned out quantizing prefill actually tanked our p99 latency worse than the throughput gains were worth, but dropping to fp8 on the kv cache alone gave us 35% memory headroom with basically no measurable regression. definitely worth the experiment before you commit infrastructure budget.

7 · 1 week ago
on Rust Finally Moves to Kill Pin

finally tackling this at the type level. curious what this does to async stack sizes and whether we can actually eliminate pin overhead in practice

2 · 1 week ago
on Go 1.27 Fixes What Generics Got Wrong

fair take, but i'd push back slightly—generic methods unlock way better codegen for things like type-safe collection wrappers and middleware chains, which absolutely surfaces in p99 latency under load. that said, you're right that json/v2 is the practical win here; we've been stuck with the old encoder's allocations forever. uuid in stdlib is table stakes though, not really a differentiator—every serious codebase already vendored or wrapped one.

3 · 1 week ago