Deslugging in Go with pprof: btcd

As btcd nears completion we decided to have at least one round of deslugging because we were much slower then bitcoind during chain download. Let me clarify that term for the ones that don’t know what that means. Deslugging is the art of measuring (or profiling) run times of individual functions, determining which ones are slugs and which ones could be optimized. Armed with that data one attacks said functions to see if there are some less then optimal algorithms. Surprisingly enough, this is often the case. An industry truism is “measuring is knowing” and attacking functions based on gut feeling often does not yield satisfying results. As always with these exercises, some things work and some don’t. Throughout this blog I’d like to walk our readers through some optimizations that succeeded, and one, objectively, failed attempt.

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btcwallet and btcgui: Wallet handling for btcd

Today Conformal is announcing alpha releases of btcwallet and btcgui, the wallet components of btcd, written in Go. We announced in a recent blog post that btcd, our full node Bitcoin implementation, was ready for public testing. We also announced that wallet functionality was being implemented separately and would be coming in the near future. Although our wallet daemon and GUI interface are not yet ready for production use, we feel they have progressed to the point where early adopters can begin testing their functionality on the Bitcoin Testnet network.

Our btcd blog post briefly discussed why wallet functionality is not a part of btcd. It highlighted various reasons why we believe separating wallet handling from blockchain handling improves on the integrated wallet design used by bitcoind and bitcoin-qt. This post will continue on that topic, further exploring the details of why a multiprocess wallet design was chosen, how such a design is beneficial to the Bitcoin community as a whole, and the implementation details this design.
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