(No I am not sharing the link as I was downvoted for it before - search for it. Hint: built with vibe)

PEEK controller, 56K modem, Verizon telco lines, rodents - all included in one cabinet

We built this system at the UofT WIRLab back in 2018-19 https://youtu.be/lTOUBUhC0Cg

And link to paper https://arxiv.org/pdf/2001.05842

1. Physical/Hardware Layer At the very bottom is the GPU silicon and its associated high-bandwidth VRAM. The model weights are partitioned, compiled, and efficiently placed so that each GPU chip and its VRAM are used to the fullest (ideally). This is where low-level kernel optimizations, fused operations, and memory access patterns matter so that everything above the chip level tries to play nice with the lowest level.

2. Intra-Node Coordination Layer Inside a single server, multiple GPUs are connected via NVLink (or equivalent high-speed interconnect). Here you use tensor parallelism (splitting matrices across GPUs), pipeline parallelism (splitting model layers across GPUs), or expert parallelism (only activating parts of the model per request) to make the model fit and run faster. The key is minimizing cross-GPU communication latency while keeping all GPUs running at full load - many low level software tricks here.

3. Inter-Node Coordination Layer When the model spans multiple servers, high-speed networking like InfiniBand comes into play. Techniques like data parallelism (replicating the model and splitting requests), hybrid parallelism (mixing tensor/pipeline/data/expert parallelism), and careful orchestration of collectives (all-reduce, all-to-all) keep throughput high while hiding model communication (slow) behind model computation (fast).

4. Request Processing Layer Above the hardware/multi-GPU layers is the serving logic: batching incoming prompts together to maximize GPU efficiency and mold them into ideal shapes to max out compute, offloading less urgent work to background processes, caching key/value attention states (KV cache) to avoid recomputing past tokens, and using paged caches to handle variable-length sequences.

5. User-Facing Serving Layer At the top are optimizations users see indirectly — multi-layer caching for common or repeated queries, fast serialization protocols like gRPC or WebSockets for minimal overhead, and geo-distributed load balancing to route users to the lowest-latency cluster.

Like the OSI model, each “layer” solves its own set of problems but works together to make the whole system scale. That’s how you get from “this model barely runs on a single high-end GPU” to “this service handles hundreds of millions of users per week with low latency.”

Thank you !

She slammed her coffee cup down one morning with the conviction of an Old Testament prophet and declared: “Exploding rabbits.”

“Excuse me?” I said, wiping marmalade off my chin.

“Exploding. Rabbits. Stuff ‘em with quarter pound of C4, or maybe just enough tannerite to surprise the neighbors but not call down the FAA, and set them loose in the Everglades. Pythons love rabbits. Boom. Problem solved. You’re welcome, America.”

Now I’ve heard my share of madcap schemes. Once she tried to compost credit card offers. But this time she looked me square in the eye with the righteous glow of a woman who had just solved two ecological crises and accidentally founded a billion-dollar startup in the process.

“We’ll call it Hare Trigger™,” she added, deadpan. “It’s got product-market fit and explosive growth potential.”

She even sketched out a logo involving a jackrabbit with aviator goggles and a plunger.

I asked if this might attract some sort of federal attention.

“Good,” she said. “That’s called buzz. Besides, the pythons started it.”

And just like that, I found myself wondering how far true it is that behind every successful man stands an even more genius woman. Waiting for Elon to offer Series A.

It’s a process of continuous uncovering, and unless you have visibility across the whole stack — from kernel to cluster — you’ll spend all your time slicing through surface layers with lots of tears being shed.

Fortunately, there are software automation solutions to this.