[roca]

Microsoft's TTD handles multiple threads on multiple cores, because they instrument reads. But that's high overhead.

I'd like to know more about what the embedded tools do. I see SourcePoint supports multicore x86, but the data volume looks high so I suspect they can't handle workloads that run for minutes or hours. Also it's not clear to me which of these tools can reproduce the state of memory at every point in the past.

Basically I don't think you can do low-overhead record and replay without hardware support like Intel's QuickRec project. "Capture all memory traffic" is not going to scale.