Pernosco

Fast, fun, omniscient debugging.

Record failures anywhere: locally, QA, CI, or in production

Record your x86-64 Linux program using rr.
Submit those recordings to Pernosco for processing and Pernosco sends you a link to access the debugger that you can use from anywhere.
Once you've captured a recording (e.g. of an intermittent test failure) you don't need to reproduce the bug again.

Rapidly debug recordings using the revolutionary Pernosco omniscient debugger

Pernosco gives you instant access to the full details of any program state at any point in time.
Pernosco visualizes control flow and data flow history so you can quickly track effects back to causes.
Pernosco transcends the limitations of traditional debugger interfaces; but it also integrates traditional debugging approaches like gdb and printf debugging — enhanced with new superpowers.

Share your recordings and debugging state with other developers

Record your debugging progress in the Pernosco notebook.
Loop in other developers to collaborate.
Or, capture recordings of test failures (e.g. from fuzzing) and send Pernosco links directly to other developers for debugging.

What people are saying about Pernosco:

A typical bug is quashed about 5 times faster.

Despite not being comfortable debugging native code with an interactive debugger, Pernosco made me feel confident and gave me super powers.

I literally (as in 30 minutes ago) just fixed a bug in 10 minutes that I thought was going to take me 3 days to fix... This is a factor of speedup on the order of 100x+, not 10x.

It’s so fantastic... Pernosco traces are just faster to solve; the power of instant jumps through time, data flow analysis, and the notebook are all incredible.

The combination of Grizzly and Pernosco have had the added benefit of making infrequent, hard to reproduce issues, actionable.

@_pernosco_ is fantastic. Its dataflow analysis (how a value ended up in the location it did) made debugging a GC bug a lot less painful.

If you like the rr debugger, you'll *love* pernosco!

Hear from Pernosco customers:

Check out Pernosco on some examples: Node race condition walkthrough, gdb use-after-free walkthrough, libbcc, Firefox, Chromium JS

Why use Pernosco in your organization? Click here to find out.

Pernosco is now available to individual developers with a Github account. Every Github user gets 5 free submissions. See our pricing page for additional details.

Pernosco is available to debug Github Actions test failures — free for approved open source projects.

Pernoso is also available for hosted and on-premises deployment for teams and organizations. Contact us for a free trial and pricing. We can adapt to your technology, pricing and business needs.

Pernosco currently targets C, C++, Ada, Rust and V8 JS (e.g. node.js) applications that run on x86-64 Linux and work with rr.