[vchuravy]

We use RR a lot with Julia. It only gives you a GDB view of the system, but it can work with any interpreted or compiled language.

Things that don't work are drivers that update mapped addresses directly. An example of this is CUDA in order to replay one would need to model the driver interactions (and that's even before you get to UVM)

Another great thing is that RR records the process tree and so you can easily look at different processes spawned by your executable.

[greg_law]

Shameless plug: https://undo.io does everything rr can but can also work with drivers that update the process memory (or unrecorded processes or even hardware). If you need that kind of advanced usage, check it out.

(Unlike rr it's not open source though - sorry! We have lots of programmes working on it full time and they insist on getting paid every month :)