> In general, performance is good for relase now. The canonconsistent
> test completes in 30 seconds here. Converting cansmi-roundtrip.smi to
> can takes 16 seconds, to smi takes 8 so canonical coding takes about
> 50% of the total time when doing a file conversion.

I've added some revisions to the kekule.cpp code, including a timeout. If the 
timeout triggers, then the ring-fragment-based LSSR analysis kicks in, which is 
imperfect, but much faster.

At the moment, I'm using a 15-second timeout, since I mainly want to prevent 
"endless" recursion in graphene, nanotubes, big fullerenes, etc. I don't want 
to set it too short, since the LSSR analysis has some clear bugs on meaningful 
structures like c60, porphyrins, etc.

The "metallocene hack" sounds about right. I think the key test for Craig was:
C12[Pr]3456789%10%11%12%13(C1C3C%13C24)(C1C9C%10C7C%121)C1C5C%11C8C61

This has 3 identical rings, but I would think finding >8 neighbors with 
identical symmetry classes would trigger the optimization you discuss.

-Geoff

P.S. I can see that we've already fixed some of Craig's issues, e.g.:
c12=c(nn2)ssnc1S        6137697


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