1) How does the step backward functionality work? Do you take snapshots every so often of the Javascript environment? How do you handle destructive assignments?
2) Does Replay record actual syscalls made by the browser, or is it recording calls to the browser APIs by the javascript code (which I guess are effectively syscalls from the javascript code's perspective)?
3) The ordered lock technique described in https://medium.com/replay-io/recording-and-replaying-d6102af... makes sure that threads access a given resource in the same order, but what about threads accessing different resources in the same order? e.g. when recording, thread 1 accesses resource A before thread 2 accesses resource B. It seems like the ordered lock technique doesn't help you maintain that ordering in the replay. Is maintaining that kind of ordering across resources not actually necessary most of the time?
1) How does the step backward functionality work? Do you take snapshots every so often of the Javascript environment? How do you handle destructive assignments?
2) Does Replay record actual syscalls made by the browser, or is it recording calls to the browser APIs by the javascript code (which I guess are effectively syscalls from the javascript code's perspective)?
3) The ordered lock technique described in https://medium.com/replay-io/recording-and-replaying-d6102af... makes sure that threads access a given resource in the same order, but what about threads accessing different resources in the same order? e.g. when recording, thread 1 accesses resource A before thread 2 accesses resource B. It seems like the ordered lock technique doesn't help you maintain that ordering in the replay. Is maintaining that kind of ordering across resources not actually necessary most of the time?