← Sunday, October 11, 2026Performance & OSTool

Culpert profiles Rust heap allocations by tracing span

github.com 8 min read Editor score 7/10

Culpert samples allocations and attributes them to tracing spans, exports pprof-compatible profiles, and provides CI-friendly diffs; geometric sampling with Bernstein correction aims for unbiased estimates. It could help teams find allocation regressions in Rust services.

What: Culpert is a sampled heap-allocation profiler for Rust that attributes allocations to spans and exports pprof-compatible profiles and CI-friendly diffs.
How: A global allocator wrapper uses geometric sampling with Bernstein correction for unbiased estimates, and the CLI provides per-span reports and diffs.
Why it matters: Engineers can use span-level profiles and CI/PR diffs to catch allocation regressions before release.

Culpert attributes sampled allocations to spans, exports profiles and supports CLI reports. Sketched from the article's own text.

Read on github.com → Lobsters

Discussion

Discussion is not switched on yet. Use Note above to keep your own thoughts on this story.

Headline, summary, brief and diagram are written by a model from the source's own text; the link, byline and numbers come from the source. Read the original before relying on a claim.