Downvoted: Because the OP stated that his non-threaded version works fine; and he's trying to use threading to speed it up.
How could moving from his two memory-based hashes, to disk-based tied hashes "speed things up", when they are at least 1000 times slower.
With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
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Upvotes all around, sirs ... (as BrowserUK excellently describes)
Downvotes all around you, sir ...
for being obsequious.
Eew'd.
“--”
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