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The Million Users Challenge

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A feed API on Postgres, any language, on a 16-core box with Postgres on its own machine. The best server in the video held 665,000. Nobody has reached a million yet.

Oct 22, 202616-core app box + 16-core Postgres box, Ubuntu 24.046 implementations4 waiting to be benchmarked
Submit your implementation ↗GitHub repo ↗
RankLanguageBest scoreFastest implementationEntries
1
C#
665,000
csharp1
2
Node
587,000
node1
3
Rust
413,000
rust1
4
Java
321,000
java1
5
Go
248,000
go1
6
Python
213,000
python1

Every language's best is public. Implementations outside the top 10 (🔒) open with the newsletter.

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How it was run

The machine. A 16-core app server, with Postgres 18 on its own 16-core box, both on Ubuntu 24.04. Load comes from separate load-generator machines.

How each entry is scored. After a 3-minute warm-up, two-minute runs double the users until one fails, then narrow down to within 5%. A 5-minute hold confirms the number, stepping down 5% until one passes. The score is the most users held for 5 minutes with p95 under 500 ms, p99 under 1 s and under 1% errors.