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Developer learning & discovery
Run the concept in your browser, then read the measurement behind it.
Editor's picks
30 articles
FeaturedDevOps Blog
Everyone treats screenshots as the expensive thing to hand an agent, so they reach for text instead. Across 25,457 measured tool results, a screenshot cost the same as reading one file at the median — and one fifth as much at the tail. Vision has a ceiling. Text does not.
FeaturedDevOps Blog
Raising the pool size is the reflex fix when a database feels slow, and past a certain point it makes things worse. I swept a PostgreSQL instance from 1 to 400 connections: throughput peaked at 48 and had lost 37% by 400, while latency multiplied by 13.
FeaturedDevOps Blog
The popular claim is that fanning out to subagents costs four to six times the tokens. Across 23,747 of my own billed turns, subagents were 12.8% of the turns and 4.6% of the bill. Both numbers are correct, and why they disagree is the whole story.
DevOps Blog
Every agent memory comparison I can find is a vendor listicle, and the token numbers inside them come from vendors arguing with each other. So I measured my own: a folder of markdown files, no vector database, and what one retrieval actually puts into the prompt.
FeaturedDevOps Blog
Everyone writes about agent cost by quoting a price per million tokens. I went through 166 real agent sessions — 23,968 billed turns — and measured where the money actually goes. The output tokens are a rounding error. The bill is the conversation being resent, over and over, and it grows with the square of the step count.
DevOps Blog
A rule written in a config file is a wish. I audited the rules I had given my coding agents and found that five of seven findings were the same failure: the rule existed, the thing that enforces it did not. Here are the four silent failure modes and the test runner that now catches them.
DevOps Blog
Daily impressions fell from 1,153 to 16 and average position went from 10 to 68 in a single day. The pages were still indexed, the site was up, and nothing had been deployed. The cause was a Cloudflare toggle that serves Googlebot a challenge page carrying noindex,nofollow.
DevOps Blog
I implemented FIFO, LRU, LFU and S3-FIFO from scratch and ran them over one million requests across three access patterns. LRU returned exactly zero hits on a cyclic scan. S3-FIFO led 8 of 12 tests, but not the ones you would guess. Code and raw output included.
DevOps Blog
S3 Standard-IA costs 45% less per GB than S3 Standard, but that is only one of four charges on the bill. This article works out the real crossover points for Standard-IA, Glacier Instant Retrieval and Intelligent-Tiering, with the formulas and live AWS prices behind every number.
DevOps Blog
Delivering 1,000 events costs 119 KB over a WebSocket and 885 KB over long polling. Measured wire bytes, delivery latency under a 50 ms round trip, and server memory for 500 connections, with the benchmark code included.
DevOps Blog
S3 is the one service that can show up in all four SAA-C03 domains, and the exam almost never asks what it is — it asks which storage class, which lifecycle rule, which endpoint. This guide covers those decisions, a phrase-to-answer cheatsheet, and the S3 defaults that changed in 2025 and 2026.
TrendingOpen Source
Self-host DeerFlow 2.0 with Docker in under 30 minutes. Step-by-step setup guide covering model configuration, sandbox architecture, and production trade-offs for ByteDance's open-source SuperAgent.
