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Hi @wahern ,
recently I am learning your timeout module and found some problems, such as some slot will be check twice during carry, bit operation has redundancy, so i made some optimization based on your code. hash optimized method is more consistent with the description in your mentioned paper, These are the main changes:
At the same time, the performance is also improved, in "Time spent expiring timeouts" the new algorithm for the first 400,000 timeout significantly better than the legacy algorithm.