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Jesús Espino
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Filter: Jesús Espino
Blog posts
How Linux readahead works, and the two ways to change it
The kernel reads your files before you ask for them, guessing from where your reads land. Here is how that guessing actually works (the window, the marker, the background fetch) and the two ways to influence it: read_ahead_kb on the device, and posix_fadvise from inside the program. Neither does quite what its name suggests.
PostgreSQL 19 interactive tour
An interactive tour of what’s new in PostgreSQL 19: property graph queries, REPACK, plan advice, temporal updates, and more, with short runnable SQL examples you can edit and run in the browser.
The Life of a Metric
Follow a single metric through its whole life inside VictoriaMetrics: born as a counter in your process, exported over the wire, given an identity and an inverted-index entry, written through an LSM tree, compressed into columnar blocks on disk, read back by a rate() query, downsampled as it ages, and finally deleted when retention runs out.
Go 1.27 interactive tour
An interactive tour of what’s new in Go 1.27: every notable language, runtime, and standard library change, with short runnable examples you can edit and run in the browser.