E Christopher Lewis discusses replay debugging which allows the debugging of non-deterministic and difficult to reproduce bugs.
Replay debugging is non-invasive. The developer need not worry that debug mode will change the scheduling of threads, the order in which locks are acquired, or the timing out of connections with external processes/machines.
In addition, replay debugging supports reverse execution which allows developers to move backwards from the manifestation of a bug to its origin.
http://www.youtube.com/watch?v=RvMlihjqlhY
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