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 32 2017-08-02T02:57:03  <warren> I'm putting together a presentation, trying to find a recent performance optimization PR that had hundreds of comments, anyone know which it was?
 33 2017-08-02T02:59:34  <warren> Wow so many PR's merged.  Clearly development is stagnant here.
 34 2017-08-02T03:00:00  <sipa> warren: eh
 35 2017-08-02T03:00:06  <sipa> could be many things
 36 2017-08-02T03:00:45  <gmaxwell> it's hard to tell how many comments there have been because github hides them
 37 2017-08-02T03:01:14  <arubi> can add comments:>100 to the search string
 38 2017-08-02T03:01:24  <warren> cool thanks
 39 2017-08-02T03:02:23  <gmaxwell> https://github.com/bitcoin/bitcoin/pull/10195  might be what you were looking for
 40 2017-08-02T03:02:32  <sipa> ah, yes
 41 2017-08-02T03:02:34  <warren> yes that's it!
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 43 2017-08-02T03:23:34  <bitcoin-git> [bitcoin] visvirial opened pull request #10974: Fix typo in sendcoinsdialog. (master...fix-typo-in-sendcoindialog) https://github.com/bitcoin/bitcoin/pull/10974
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 70 2017-08-02T06:55:10  <bitcoin-git> [bitcoin] laanwj pushed 2 new commits to master: https://github.com/bitcoin/bitcoin/compare/f66c59650527...f0579bfea1db
 71 2017-08-02T06:55:11  <bitcoin-git> bitcoin/master 7f121a0 Masahiko Hyuga: Fix typo in sendcoinsdialog.
 72 2017-08-02T06:55:11  <bitcoin-git> bitcoin/master f0579bf Wladimir J. van der Laan: Merge #10974: Fix typo in sendcoinsdialog....
 73 2017-08-02T06:55:50  <bitcoin-git> [bitcoin] laanwj closed pull request #10974: Fix typo in sendcoinsdialog. (master...fix-typo-in-sendcoindialog) https://github.com/bitcoin/bitcoin/pull/10974
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 75 2017-08-02T07:01:30  <bitcoin-git> [bitcoin] laanwj pushed 3 new commits to master: https://github.com/bitcoin/bitcoin/compare/f0579bfea1db...659c09613408
 76 2017-08-02T07:01:31  <bitcoin-git> bitcoin/master b13a68e Pieter Wuille: Squashed 'src/leveldb/' changes from 196962ff0..c521b3ac6...
 77 2017-08-02T07:01:31  <bitcoin-git> bitcoin/master 47f3e8c Pieter Wuille: Update LevelDB with latest Bitcoin-specific patches
 78 2017-08-02T07:01:32  <bitcoin-git> bitcoin/master 659c096 Wladimir J. van der Laan: Merge #10958: Update to latest Bitcoin patches for LevelDB...
 79 2017-08-02T07:01:56  <bitcoin-git> [bitcoin] laanwj closed pull request #10958: Update to latest Bitcoin patches for LevelDB (master...20170731_leveldb) https://github.com/bitcoin/bitcoin/pull/10958
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 95 2017-08-02T08:07:02  <bitcoin-git> [bitcoin] practicalswift opened pull request #10975: [script] Return early if no valid opcodes found in CountWitnessSigOps(...) (master...return-early-in-CountWitnessSigOps) https://github.com/bitcoin/bitcoin/pull/10975
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142 2017-08-02T10:50:38  <jonasschnelli> Got a request from a miner: what is the best document to figure out how to create segwit coinbase transactions?
143 2017-08-02T10:50:49  <jonasschnelli> https://github.com/bitcoin/bips/blob/master/bip-0141.mediawiki?
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148 2017-08-02T12:06:37  <bitcoin-git> [bitcoin] ryanofsky opened pull request #10976: [MOVEONLY] Move some static functions out of wallet.h/cpp (master...pr/wmove) https://github.com/bitcoin/bitcoin/pull/10976
149 2017-08-02T12:10:31  <bitcoin-git> [bitcoin] practicalswift opened pull request #10977: [net] Fix use of uninitialized value in getnetworkinfo(const JSONRPCRequest& request) (master...valgrind-getnetworkinfo) https://github.com/bitcoin/bitcoin/pull/10977
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268 2017-08-02T21:59:40  <gmaxwell> jnewbery: https://twitter.com/jfnewbery/status/892856516985991170  I think this is misleading. Retarget modified the difficulty from the prior block, so it's likely to double apply a dip, not undo it.
269 2017-08-02T22:00:09  <gmaxwell> Though it depends on when in the retarget window the crazy-change applies.
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272 2017-08-02T22:00:46  <gmaxwell> E.g. if 20 blocks before the retarget the 12h rule triggers, it will then drop the difficulty 73.7% (because when it triggers it triggers 6 times in a row...)
273 2017-08-02T22:01:22  <gmaxwell> then you'll get to the retarget, and the code will go "oh wow, took longer than expected for the last 2016 blocks, better lower the difficulty".
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275 2017-08-02T22:11:26  <gmaxwell> E.g. the worst case is probably something like you run at 1/11th the hashrate for a whole retarget interval, then just before the end, hit the magic rule. This drops your difficulty by 3.8, then the retarget will apply and drop the diffuclty by a factor of 11, resuting in blocks being about 4x too fast.
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283 2017-08-02T22:37:51  <jnewbery> thanks gmaxwell. Yes, makes sense
284 2017-08-02T22:38:08  <jnewbery> Having two difficulty readjustment algorithms is confusing :/
285 2017-08-02T22:39:05  <jnewbery> I assumed that normal retarget was based on the previous retarget nBits, not pindexLast
286 2017-08-02T22:39:28  <jnewbery> (which of course would be the same thing if you didn't change nBits within a retarget window)
287 2017-08-02T22:42:22  <gmaxwell> jnewbery: yea, more or less an accident of software construction that it uses the last rather than the last retarget.
288 2017-08-02T22:42:40  <gmaxwell> This actually creates a bug for testnet's diff1 rule, if it happens at the wrong block it'll warp testnet's difficulty back to 1.
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