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Re: [tlaplus] Getting all possible unique traces

On 10/12/21 11:37 PM, Vladislav Shpilevoy wrote:
Hi! I've just watched the TLA+ video course, and started writing my own specs. But almost immediately realized I have very view means to ensure that the spec actually checks the intended behaviour. As Leslie L. said, you should be afraid when it says the model is correct. So to see what the model actually checks I used 2 means so far. Both work, but have drawbacks. (I use command line tool.)

1) `-dump` option. It saves all reachable states into a file. But in my very simple model (FIFO) with just one possible trace it saves some states multiple times into the dump file. Which looks like they are repeating or even revert some variable and 'violate' my invariants. But when I dump into `-dump dot` file, it looks absolutely correct. No duplicates, no reverts. However with big number of states I expect it might look hard to read on a picture, even in .svg.

2) `-simulate` option. I found that it runs infinitely without any output if not given more args. If you specify `file=...`, it just generates infinite number of the same files (in my case they are all the same - the unique trace is just one). However if you limit their max number, you can't be sure you got all the possible traces before the max number was reached.

Is there a builtin way to inspect all possible unique traces which I missed somehow? It would also be very useful for writing tests for future more complicated models when you start coding them.



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