[emmelaich]

rr uses/enhances gdb, so I guess you mean faster than gdb alone?

(It wasn't clear to me until I followed a few links - I hadn't heard of rr.)

[lambda]

Yes, I meant faster than gdb's native record and replay feature.

The nice thing about rr is that you can still use it with gdb, so you have the full power of gdb along with close to native speed record and reply. Once the x86-64 support is ready, it'll probably be a common tool for me.