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00:00 < gmaxwell> lol     
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00:06 < jonasschnelli> heh     
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01:37 < emucode> what if... that was the deep learning that discovered asicboost? :o
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05:29 < bitcoin-git> [bitcoin] laanwj pushed 6 new commits to master: https://github.com/bitcoin/bitcoin/compare/1b25b6df0f08...342b9bc3907e
05:29 < bitcoin-git> bitcoin/master c21cbe6 Pieter Wuille: Introduce FastRandomContext::randbool()
05:29 < bitcoin-git> bitcoin/master 663fbae Pieter Wuille: FastRandom benchmark
05:29 < bitcoin-git> bitcoin/master e04326f Pieter Wuille: Add ChaCha20
05:29 < bitcoin-git> [bitcoin] laanwj closed pull request #9792: FastRandomContext improvements and switch to ChaCha20 (master...chacha) https://github.com/bitcoin/bitcoin/pull/9792
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05:52 < BlueMatt> wumpus: the same bottom-of-the-barrel buzzword bingo that came up with "using normal computers to simulate quantum computers to do bitcoin mining"
05:54 <@wumpus> BlueMatt: ah yes the "apply all the buzzwords to bitcoin mining, see what sticks" approach
05:54 < sipa> BlueMatt: i'm almost done splitting up pertxoutcache into more reasonable pieces... prepare to review 25 commits :)
05:54 <@wumpus> "bitcoin mining on mars"
05:55 < jtimon> uff, none of those are preparation commits that could be merged beforehand?
05:56 < BlueMatt> sipa: god damn it
05:56 < BlueMatt> jtimon: several already have been split out into separate prs, I think :)
05:57 < BlueMatt> sipa: anyway, you're gonna have to wait until i spend two days on morcos' fee estimation stuff first, I think
05:57 < jtimon> BlueMatt: what about using deep learning to come up with software optimizations that beat sha256d asics using gpgpu?
05:57 < BlueMatt> sipa: I keep getting distracted because your stuff is easier for me to review, and I need to spend a day figuring out wtf fee estimation does
05:57  * jtimon goes to read open PRs by sipa
05:58 < BlueMatt> jtimon: sounds good, lets raise 10 mill and then tell investors it didnt work out the next day?
05:58 < BlueMatt> can split the 5 even?
05:59 < BlueMatt> or is that kind of overt scam reserved for ICOs now? :/
06:00 < fanquake> Not sure what an ICO is, but I heard you could raise >10 times that just by building an internet connected juicer
06:01 < BlueMatt> fanquake: I figured they just got so used to squeezing investors for money all they knew how to build was something that squeezed the contents out of bags
06:01 < BlueMatt> *rimshot*
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06:03 <@wumpus> fanquake BlueMatt lol
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06:04 <@wumpus> the bags weren't even blockchain connected smart property :')
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06:09 < BlueMatt> wumpus: clearly we can further optimize their buzzword-compliance
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06:14 < fanquake> Since we seem to be giving Boost removal a good shot for 0.15, does anyone have suggestions for replacing GetNumCores? https://github.com/bitcoin/bitcoin/blob/master/src/util.cpp#L881
06:14 < fanquake> There is std::thread::hardware_concurrency(), but that seems to count virtual cores, which I don't think we want.
06:14 < BlueMatt> fanquake: I doubt we'll do boost removal for 0.15
06:14 < BlueMatt> shit like BOOST_FOREACH, sure
06:15 < BlueMatt> but all of boost? doubtful, there are still things we need
06:16 < fanquake> Yea sorry, not the whole lot, but we can remove a decent chunk. Just looking into what else needs to be done to replace some of the less involved Boost usage.
06:16 < BlueMatt> fair
06:17 <@wumpus> yes, it makes sense to plan ahead a bit, without immediately doing it
06:18 <@wumpus> right, don't count virtual cores, that used to be the case but it makes no sense for our usage
06:19 <@wumpus> it'd create a swarm of threads overwhelming any machine with hyperthreading (+accompanying thread stack overhead), for script validation, and there was no gain at all for that
06:20 < sipa> BlueMatt: don't worry, there is no hurry
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06:59 < morcos> wumpus: i don't think that is correct
06:59 < morcos> suppose you have 4 cores (8 virtual cores)
06:59 <@wumpus> fanquake: indeed seems that std has no equivalent to physical_concurrency, on any standard. That's annoying as it is non-trivial to implement
06:59 < morcos> i think running par=8 (if it let you) would be notably faster
06:59 < morcos> jeremyrubin and i discussed this at length a while back... i think i commented about it on irc at the time
07:00 <@wumpus> morcos: I think the conclusion at the time was that it made no difference, but sure would make sense to benchmark
07:00 < morcos> perhaps historical testing on the virtual vs actual cores was polluted by concurrency issues that have now improved
07:00 <@wumpus> I think there are not more ALUs, so there is not really a point in having more threads
07:01 <@wumpus> hyperthreads are basically just a stored register state right?
07:02 < sipa> wumpus: yes but it helps the scheduler
07:02 <@wumpus> in which case the only speedup using "number of cores" threads would give you is, possibly, excluding other software from running on the cores on the same time
07:02 < morcos> well this is where i get out of my depth
07:02 < sipa> if one of the threads is waiting on a read from ram, the other can use the arithmetic unit for example
07:02 < morcos> wumpus: i'm pretty sure though that the speed up is considerably more than what you might expect from that
07:02 <@wumpus> sipa: ok, I back down, I didn't want to argue this at all
07:03 < morcos> the reason i haven't tested it myself, is the machine i usually use has 16 cores... so not easy due to remaining concurrency issues to get much more speedup
07:03 <@wumpus> I'm fine with restoring it to number of virtual threads if that's faster
07:03 < morcos> we should have somene with 4 cores (and 8) actually test it though, i agree
07:03 < sipa> i would expect (but we should benchmark...) that if 8 scriot validation threads instead of 4 on a quadcore hyperthreading is not faster, it's due to lock contention
07:04 < morcos> sipa: yeah thats my point, i think lock contention isn't that bad with 8 now
07:04 <@wumpus> on 64-bit systems the additional thread overhead wouldn't be important at least
07:04 < gmaxwell> I previously benchmarked, a long time ago, it was faster.
07:04 < gmaxwell> (to use the HT core count)
07:04 <@wumpus> why was this changed at all then?
07:04 <@wumpus> I'm confused
07:05 < sipa> good question!
07:05 < gmaxwell> I had no idea we changed it.
07:05 <@wumpus> sigh :(
07:05 < gmaxwell> What PR changed it?
07:06 < gmaxwell> In any case, on 32-bit it's probably a good tradeoff... the extra ram overhead is worth avoiding.
07:07 <@wumpus> https://github.com/bitcoin/bitcoin/pull/6361
07:07 < gmaxwell> PR 6461 btw.
07:07 < gmaxwell> er lol at least you got it right.
07:07 <@wumpus> the complaint was that systems became unsuably slow when using that many thread
07:07 <@wumpus> so at least I got one thing right, woohoo
07:07 < sipa> seems i even acked it!
07:07 < BlueMatt> wumpus: there are more alus
07:08 < BlueMatt> but we need to improve lock contention first
07:08 < morcos> anywya, i think in the past the lock contention made 8 threads regardless of cores a bit dicey.. now that is much better (although more still to be done)
07:09 < BlueMatt> or we can just merge #10192, thats fee
07:09 < gribble> https://github.com/bitcoin/bitcoin/issues/10192 | Cache full script execution results in addition to signatures by TheBlueMatt · Pull Request #10192 · bitcoin/bitcoin · GitHub
07:09 < BlueMatt> s/fee/free/
07:09 < morcos> no, we do not need to improve lock contention first.   but we should probably do that before we increase the max beyond 16
07:09 < BlueMatt> then we can toss concurrency issues out the window and get more speedup anyway
07:09 < gmaxwell> wumpus: yea, well in QT I thought we also diminished the count by 1 or something?  but yes, if the motivation was to reduce how heavily the machine was used, thats fair.
07:09 < sipa> the benefit of using HT cores is certainly not a factor 2
07:09 <@wumpus> gmaxwell: for the default I think this makes a lot of sense, yes
07:10 < gmaxwell> morcos: right now on my 24/28 physical core hosts going beyond 16 still reduces performance.
07:10 <@wumpus> gmaxwell: do we also restrict the maximum par using this? that'd make less sense
07:10 <@wumpus> if someone *wants* to use the virtual cores they should be able to by setting -par=
07:10  * sipa flies to US
07:10 < BlueMatt> sipa: sure, but the shared cache helps us get more out of it than some others, as morcos points out
07:11 < BlueMatt> (because it means our thread contention issues are less)
07:12 < morcos> gmaxwell: yeah i've been bogged down in fee estimation as well (and the rest of life) for a while now.. otherwise i would have put more effort into jeremy's checkqueue
07:12 < BlueMatt> morcos: heh, well now you can do other stuff while the rest of us get bogged down in understanding fee estimation enough to review it :p
07:12 <@wumpus> [to answer my own question: no, the limit for par is MAX_SCRIPTCHECK_THREADS, or 16]
07:12 < morcos> but to me optimizing for more than 16 cores is pretty valuable as miners could use beefy machines and be less concerned by block validation time
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07:14 < BlueMatt> morcos: i think you may be surprised by the number of mining pools that are on VPSes that do not have 16 cores :/
07:15 < gmaxwell> I assume right now most of the time block validation is bogged in the parts that are not as concurrent. simple because caching makes the concurrent parts so fast. (and soon to hopefully increase with bluematt's patch)
07:17 < gmaxwell> improving sha2 speed, or transaction malloc overhead are probably bigger wins now for connection at the tip than parallelism beyond 16 (though I'd like that too).
07:18 < BlueMatt> sha2 speed is big
07:18 < morcos> yeah lots of things to do actually... 
07:18 < gmaxwell> BlueMatt: might be a tiny bit less big if we didn't hash the block header 8 times for every block. :P 
07:21 < BlueMatt> ehh, probably, but I'm less rushed there
07:21 < BlueMatt> my new cache thing is about to add a bunch of hashing
07:21 < BlueMatt> 1 sha round per tx
07:22 < BlueMatt> and sigcache is obviously a ton
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07:47 < bitcoin-git> [bitcoin] laanwj pushed 7 new commits to master: https://github.com/bitcoin/bitcoin/compare/342b9bc3907e...fa1ac2881f2a
07:47 < bitcoin-git> bitcoin/master 71afe3c Wladimir J. van der Laan: wallet: Introduce database handle wrapper...
07:47 < bitcoin-git> bitcoin/master 071c955 Wladimir J. van der Laan: wallet: Get rid of fFileBacked...
07:47 < bitcoin-git> bitcoin/master be9e1a9 Wladimir J. van der Laan: wallet: Reduce references to global bitdb environment
07:47 < bitcoin-git> [bitcoin] laanwj closed pull request #9951: Wallet database handling abstractions/simplifications (master...2017_03_wallet_dbwrapper) https://github.com/bitcoin/bitcoin/pull/9951
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07:58 <@wumpus> fanquake: re: #10260, how is homebrew versioned? should the instructions always apply to only the latest version?
07:58 < gribble> https://github.com/bitcoin/bitcoin/issues/10260 | [doc] Minor corrections to osx dependencies by fanquake · Pull Request #10260 · bitcoin/bitcoin · GitHub
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13:00  * BlueMatt is still so confused as to why he has to manually build util.cpp without lto to get a full-bitcoind lto build to work
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13:37 < achow101> gmaxwell: any update on publishing that alert key?
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16:08 < bitcoin-git> [bitcoin] sipa pushed 3 new commits to master: https://github.com/bitcoin/bitcoin/compare/fa1ac2881f2a...c73af5416b66
16:08 < bitcoin-git> bitcoin/master 344a2c4 Pieter Wuille: Add support for std::unordered_{map,set} to memusage.h
16:08 < bitcoin-git> bitcoin/master e6756ad Pieter Wuille: Switch CCoinsMap from boost to std unordered_map
16:08 < bitcoin-git> bitcoin/master c73af54 Pieter Wuille: Merge #10249: Switch CCoinsMap from boost to std unordered_map...
16:08 < bitcoin-git> [bitcoin] sipa closed pull request #10249: Switch CCoinsMap from boost to std unordered_map (master...stdcoinmap) https://github.com/bitcoin/bitcoin/pull/10249
--- Log closed Mon Apr 24 16:26:25 2017
--- Log opened Mon Apr 24 16:38:48 2017
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--- Log closed Mon Apr 24 16:46:09 2017
--- Log opened Mon Apr 24 16:56:44 2017
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18:32 < bitcoin-git> [bitcoin] fanquake opened pull request #10270: Remove Clang workaround for Boost 1.46 (master...remove-boost-clang-workaround) https://github.com/bitcoin/bitcoin/pull/10270
18:40 < bitcoin-git> [bitcoin] fanquake opened pull request #10271: Use std::thread::hardware_concurrency, instead of Boost, to determine available cores (master...replace-boost-getnumcores) https://github.com/bitcoin/bitcoin/pull/10271
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23:49 < bitcoin-git> [bitcoin] paveljanik opened pull request #10272: [Tests] Prevent warning: variable 'x' is uninitialized (master...20170425_FastRandomContext_test_warnings) https://github.com/bitcoin/bitcoin/pull/10272
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