False sharing killed our performance. Data-oriented design saved it.

1 Prologue
A while ago, I took a flight from Canada back to Hong Kong - about 12 hours in total with Air Canada.
Interestingly, the plane actually had WiFi:














However, the WiFi had restrictions. For Aeroplan…

some notes on pleasure

A thorough review of a major cloud outage.

Last night, I caused something on X by saying that (most) transactional databases should be single-threaded and aggressively sharded:

hot take: databases should be single-threaded

someone a long time ago decided that database shards should be multi-threaded.…

CVE-2025-14847 allows attackers to read any arbitrary data from the database's heap memory. It affects all MongoDB versions since 2017, here's a simple explanation:

If childhood is half of our subjective life, how should that change how we live?