Add Garbage Collector about twemcache HOT 3 OPEN

We have given garbage collection some serious thoughts and I agree with you on the benefits it could bring. What stopped us from simply incorporate something similar already was the memory overhead, which is noticeable for smaller items.

I feel quite a few things could be done to make memory management better, unfortunately I have to shelf the development on Twemcache (other than bug fixes) due to lack of resources. Hopefully I can come back to this in the summer (Q3) and do an in-depth summary and planning about the memory management module as a whole.

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Cool, please let me know if I could help somehow in the process.

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I think the better approach, as Jamie suggested in the thread, is to use a background, latency oblivious thread to do the clean-ups. If you want to extend the current threading architecture of Twemcache, which uses background threads for various tasks, I'll be happy to review it and merge.

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