--- Day changed Sun Jun 10 2018 00:10 -!- ilufang [~ilufang@vpnpool-130-126-152-202.near.illinois.edu] has quit [Ping timeout: 240 seconds] 00:13 -!- vicenteH [~user@35.233.15.37.dynamic.jazztel.es] has quit [Ping timeout: 245 seconds] 00:17 -!- grafcaps [~haroldbr@50.90.83.229] has joined #bitcoin-core-dev 00:18 -!- ilufang [~ilufang@vpnpool-130-126-152-202.near.illinois.edu] has joined #bitcoin-core-dev 00:21 -!- grafcaps [~haroldbr@50.90.83.229] has quit [Ping timeout: 264 seconds] 00:37 < ilufang> quit 00:37 -!- ilufang [~ilufang@vpnpool-130-126-152-202.near.illinois.edu] has quit [Quit: WeeChat 2.0.1] 00:51 -!- schnerch- [~schnerchi@2a01:4f8:c0c:afe::2] has quit [Ping timeout: 256 seconds] 00:53 -!- schnerchi [~schnerchi@static.120.187.99.88.clients.your-server.de] has joined #bitcoin-core-dev 00:55 -!- promag [~promag@bl22-247-244.dsl.telepac.pt] has joined #bitcoin-core-dev 01:00 -!- promag [~promag@bl22-247-244.dsl.telepac.pt] has quit [Ping timeout: 268 seconds] 01:56 -!- promag [~promag@bl22-247-244.dsl.telepac.pt] has joined #bitcoin-core-dev 02:01 -!- promag [~promag@bl22-247-244.dsl.telepac.pt] has quit [Ping timeout: 256 seconds] 02:08 < provoostenator> sipa: thanks for the extra context. Maintaining a large dbcache is mainly useful during IBD, so can't the problem of reorgs be avoided by only doing the optimization for very deep blocks? 02:10 < provoostenator> And just in case, if during IBD an alternative set of headers is found that would trigger a deep reorg, you'd flush the cache and turn off the optimization, before switching to that new branch. 02:14 < provoostenator> Right now it seems that 500 MB < dbcache < 7000 MB is a performance dead zone. Though I can try tweaking #11658 to see where the diminishing returns are. 02:14 < gribble> https://github.com/bitcoin/bitcoin/issues/11658 | During IBD, when doing pruning, prune 10% extra to avoid pruning again soon after by luke-jr · Pull Request #11658 · bitcoin/bitcoin · GitHub 02:25 -!- Victorsueca [~Victorsue@unaffiliated/victorsueca] has quit [Read error: Connection reset by peer] 02:27 -!- Victorsueca [~Victorsue@unaffiliated/victorsueca] has joined #bitcoin-core-dev 02:30 -!- promag [~promag@bl22-247-244.dsl.telepac.pt] has joined #bitcoin-core-dev 02:43 -!- zivl [~zivl@2601:19a:837f:e4e1:f81f:eab6:8931:4be5] has joined #bitcoin-core-dev 02:43 -!- promag [~promag@bl22-247-244.dsl.telepac.pt] has quit [Remote host closed the connection] 02:49 -!- promag [~promag@bl22-247-244.dsl.telepac.pt] has joined #bitcoin-core-dev 02:58 -!- promag [~promag@bl22-247-244.dsl.telepac.pt] has quit [Remote host closed the connection] 02:58 -!- promag [~promag@bl22-247-244.dsl.telepac.pt] has 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#bitcoin-core-dev 08:37 -!- cryptapus [~cryptapus@jupiter.osmus.org] has joined #bitcoin-core-dev 08:37 -!- cryptapus [~cryptapus@jupiter.osmus.org] has quit [Changing host] 08:37 -!- cryptapus [~cryptapus@unaffiliated/cryptapus] has joined #bitcoin-core-dev 08:47 -!- Chris_Stewart_5 [~chris@unaffiliated/chris-stewart-5/x-3612383] has joined #bitcoin-core-dev 08:52 -!- d9b4bef9 [~d9b4bef9@web501.webfaction.com] has quit [Remote host closed the connection] 08:53 -!- d9b4bef9 [~d9b4bef9@web501.webfaction.com] has joined #bitcoin-core-dev 08:58 < provoostenator> Do I understand correctly that the only way for a coin cache entry to be dirty, is if the UTXO existed before the last flush and was spent since then? Would it be worth trying to bypass the cache in those cases and update the disk when spending a UTXO that's not in the cache? 09:01 < provoostenator> I wonder if OS's make any effort to optimize a write to the same physical place on disk that you just read from. 09:02 < sipa> provoostenator: it can be dirty because it's created after the last flush, or spent after the last flush while ot was created before 09:03 < sipa> and of course we can bypass the cache... if we don't care about the performance it offers 09:04 < sipa> provoostenator: i guess we could only do the background flushing during IBD, but that's still very scary 09:07 < provoostenator> "dirty because it's created after the last flush" - how does that work? I thought they always get the FRESH flag in that case. 09:08 < provoostenator> (I meant DIRTY flag, not dirty in general db terminology) 09:09 < provoostenator> Of course I do care about the performance impact of such a change. My working theory is that too many DITRY entries slows things down to a state that's worse than a smaller cache. So perhaps preventing accumulation of DIRTY entries would prevent that. 09:10 < provoostenator> (my "aggresive" pruning branch is much slower than master, despite the cache growing much bigger) 09:11 < provoostenator> I'm currently running IBD from block 320,000 - 480,000 on my iMac several times with decreasing dbcache (and once from genesis without interrupting) to see what happens. 09:18 < provoostenator> My hypothesis, based on what I've seen so far, is that when running from genesis to with "infinite" cache, going from 320K to 480K will be fastest. Followed by starting at 320K with infinite cache. A 3 GB cache will be slower, but a 500 MB cache will _faster_ than a 3 GB cache. Possibly regardless of pruning. 09:19 < gmaxwell> I think that would be very surprising. 09:20 < provoostenator> Indeed 09:24 < bitcoin-git> [bitcoin] ken2812221 opened pull request #13426: [WIP, bugfix] Add u8path and u8string to boost to fix #13103 (master...u8path_u8string) https://github.com/bitcoin/bitcoin/pull/13426 09:24 -!- SopaXorzTaker [~SopaXorzT@unaffiliated/sopaxorztaker] has joined #bitcoin-core-dev 09:31 < sipa> provoostenator: FRESH implies DIRTY 09:31 < sipa> provoostenator: too many dirty entries slows things down... there may be a memory locality effect from just having many entries, but i don't see any way how dirtyness can impact that 09:32 < provoostenator> sipa: ah I see, so I should have said "DIRTY but not FRESH" 09:33 < provoostenator> Is there any sorting going on when entries are added? 09:33 -!- Victorsueca [~Victorsue@unaffiliated/victorsueca] has quit [Read error: Connection reset by peer] 09:34 < sipa> no 09:34 < sipa> it's a hash table 09:34 < sipa> provoostenator: i meant to say "about too many dirty entries slowing things doen" 09:34 < sipa> i don't believe that can be the case 09:35 -!- Victorsueca [~Victorsue@unaffiliated/victorsueca] has joined #bitcoin-core-dev 09:39 < sipa> provoostenator: the time to flush itself may be proportional or worse to the number of dirty entries, though 09:42 < provoostenator> From what I saw on my AWS nodes, the pruning (which usually coincided with a cache flash) took just minutes and happened just a dozen or so times, on a IBD measured in days. 09:43 < sipa> right 09:43 < sipa> that seems expected 09:43 < provoostenator> So if an entry is not found int he cache, it starts walking through the disk looking for it? But there's no reason to assume that would be slower than without cache. 09:44 < sipa> of course disk will be slower than cache 09:44 < sipa> is it possible you're running into swap space? 09:45 < provoostenator> Amazon Ubuntu images don't have swap on by default, so I don't think so, but I already deleted those machine. 09:45 -!- AaronvanW [~AaronvanW@unaffiliated/aaronvanw] has joined #bitcoin-core-dev 09:49 < provoostenator> At least I can rule that out in this current experiment, since I have 48 GB RAM 09:50 -!- promag [~promag@bl22-247-244.dsl.telepac.pt] has joined #bitcoin-core-dev 09:52 < provoostenator> When there's a cache, every time it calls CCoinsViewCache::FetchCoin it walks through the memory cache and if nothing is found walks through the disk cache. So there's potentially some duplicate effort, maybe that becomes a problem? 09:53 < provoostenator> Oh no, because it's a hash table, it's not walking, it just fetches it. 09:53 < provoostenator> The term "iterator" confused me there. 09:54 < sipa> yes 09:54 -!- Chris_Stewart_5 [~chris@unaffiliated/chris-stewart-5/x-3612383] has quit [Ping timeout: 264 seconds] 09:54 < sipa> and on disk, it just fetches from leveldb, which has indexes and other structure to guide the search - it's isn't really iterating either 09:56 < provoostenator> If a big cache causes a slowdown compared to a small cache, it has to be the in-memory stuff I would guess. 09:58 -!- promag [~promag@bl22-247-244.dsl.telepac.pt] has quit [Remote host closed the connection] 10:02 -!- promag [~promag@bl22-247-244.dsl.telepac.pt] has joined #bitcoin-core-dev 10:04 < sipa> how long does flushing take? 10:04 < sipa> it can be minutes even on high end systems for multi-gb caches 10:05 -!- Chris_Stewart_5 [~chris@unaffiliated/chris-stewart-5/x-3612383] has joined #bitcoin-core-dev 10:07 < provoostenator> Minutes as far as I know, let me upload the logs... 10:10 -!- Sinclair6 [sinclair6@gateway/vpn/privateinternetaccess/sinclair6] has joined #bitcoin-core-dev 10:11 -!- Guyver2 [AdiIRC@guyver2.xs4all.nl] has quit [Quit: Going offline, see ya! (www.adiirc.com)] 10:17 < provoostenator> https://ufile.io/tlvv3 (prune3000_sjors.log was the slowest, I gave up after 5 days) 10:20 -!- promag [~promag@bl22-247-244.dsl.telepac.pt] has quit [Remote host closed the connection] 10:20 < provoostenator> TIL about OnionShare, so here you go: http://4nzykwc37ncqcwhp.onion/recall-shiftless 10:29 -!- Chris_Stewart_5 [~chris@unaffiliated/chris-stewart-5/x-3612383] has quit [Ping timeout: 256 seconds] 10:32 -!- Krellan [~Krellan@2601:640:4000:9258:18ab:eec7:63e:b0fa] has quit [Read error: Connection reset by peer] 10:33 -!- Krellan [~Krellan@2601:640:4000:9258:18ab:eec7:63e:b0fa] has joined #bitcoin-core-dev 10:34 -!- ossifrage [~ossifrage@unaffiliated/ossifrage] has quit [Ping timeout: 260 seconds] 10:40 -!- AaronvanW [~AaronvanW@unaffiliated/aaronvanw] has quit [Remote host closed the connection] 10:42 -!- ossifrage [~ossifrage@unaffiliated/ossifrage] has joined #bitcoin-core-dev 10:44 -!- promag [~promag@bl22-247-244.dsl.telepac.pt] has 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seconds] 15:48 -!- nuke_bloodaxe [~davidck@101.100.144.173] has joined #bitcoin-core-dev 15:48 -!- AaronvanW [~AaronvanW@unaffiliated/aaronvanw] has quit [Ping timeout: 260 seconds] 15:49 -!- promag [~promag@bl22-247-244.dsl.telepac.pt] has joined #bitcoin-core-dev 15:53 -!- globalchain [62cf85cd@gateway/web/freenode/ip.98.207.133.205] has joined #bitcoin-core-dev 15:53 -!- jimpo [~jimpo@ec2-34-211-143-113.us-west-2.compute.amazonaws.com] has joined #bitcoin-core-dev 15:57 -!- nullptr| [~nullptr|@ip-94-113-103-134.net.upcbroadband.cz] has joined #bitcoin-core-dev 15:58 -!- bitconner [~conner@136.24.175.89] has quit [Ping timeout: 260 seconds] 15:58 -!- bitconner [~conner@136.24.175.89] has joined #bitcoin-core-dev 16:03 -!- bitconner [~conner@136.24.175.89] has quit [Ping timeout: 265 seconds] 16:05 -!- drexl [~drexl@cpc130676-camd16-2-0-cust445.know.cable.virginm.net] has joined #bitcoin-core-dev 16:08 -!- Guest47913 is now known as eenoch 16:09 -!- eenoch is now known as Guest99396 16:10 -!- nullptr| [~nullptr|@ip-94-113-103-134.net.upcbroadband.cz] has quit [Ping timeout: 265 seconds] 16:19 -!- justanotheruser [~justanoth@unaffiliated/justanotheruser] has joined #bitcoin-core-dev 16:21 -!- bitconner [~conner@136.24.175.89] has joined #bitcoin-core-dev 16:27 -!- bitconner [~conner@136.24.175.89] has quit [Ping timeout: 264 seconds] 16:28 -!- AaronvanW [~AaronvanW@unaffiliated/aaronvanw] has joined #bitcoin-core-dev 16:29 -!- bitconner [~conner@136.24.175.89] has joined #bitcoin-core-dev 16:34 -!- OS-11936 [~OS-11936-@unaffiliated/os-11936] has quit [Ping timeout: 268 seconds] 16:34 -!- bitconner [~conner@136.24.175.89] has quit [Ping timeout: 240 seconds] 16:35 < sipa> gmaxwell: i win 16:35 < sipa> intel's SSE4 sha256 code, transliterated to sse4 intrinsics... is 8% faster than the asm version 16:35 < sipa> (on a Ryzen system) 16:38 -!- bitconner [~conner@136.24.175.89] has joined #bitcoin-core-dev 16:43 -!- promag [~promag@bl22-247-244.dsl.telepac.pt] has quit [Remote host closed the connection] 16:45 -!- nullptr| [~nullptr|@ip-94-113-103-134.net.upcbroadband.cz] has joined #bitcoin-core-dev 16:45 -!- globalchain [62cf85cd@gateway/web/freenode/ip.98.207.133.205] has quit [Quit: Page closed] 16:49 < sipa> on i7 the intrinsics version is slightly slower (0.7% slower for long hashes, 1.5% slower for double-SHA256, 4$ slower for 32-byte hashes) 16:49 -!- nullptr| [~nullptr|@ip-94-113-103-134.net.upcbroadband.cz] has quit [Ping timeout: 240 seconds] 16:54 -!- AaronvanW [~AaronvanW@unaffiliated/aaronvanw] has quit [Read error: Connection reset by peer] 16:55 -!- AaronvanW [~AaronvanW@unaffiliated/aaronvanw] has joined #bitcoin-core-dev 17:17 * luke-jr is not very surprised 17:18 -!- drexl [~drexl@cpc130676-camd16-2-0-cust445.know.cable.virginm.net] has quit [Quit: drexl] 17:22 -!- AaronvanW [~AaronvanW@unaffiliated/aaronvanw] has quit [Remote host closed the connection] 17:23 -!- AaronvanW [~AaronvanW@unaffiliated/aaronvanw] has joined 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nullptr| [~nullptr|@ip-94-113-103-134.net.upcbroadband.cz] has quit [Ping timeout: 240 seconds] 18:47 -!- nullptr| [~nullptr|@ip-94-113-103-134.net.upcbroadband.cz] has joined #bitcoin-core-dev 18:54 -!- nullptr| [~nullptr|@ip-94-113-103-134.net.upcbroadband.cz] has quit [Ping timeout: 260 seconds] 18:59 -!- nullptr| [~nullptr|@ip-94-113-103-134.net.upcbroadband.cz] has joined #bitcoin-core-dev 19:00 -!- Krellan [~Krellan@2601:640:4000:9258:18ab:eec7:63e:b0fa] has quit [Read error: Connection reset by peer] 19:00 -!- Krellan [~Krellan@2601:640:4000:9258:18ab:eec7:63e:b0fa] has joined #bitcoin-core-dev 19:04 < echeveria> 2018-06-11 02:03:03.384975 Verifying last 3 blocks at level 3 19:04 < echeveria> 2018-06-11 02:03:23.676793 No coin database inconsistencies in last 4 blocks (6564 transactions) 19:04 < echeveria> off by one? 19:23 -!- d9b4bef9 [~d9b4bef9@web501.webfaction.com] has quit [Remote host closed the connection] 19:24 -!- d9b4bef9 [~d9b4bef9@web501.webfaction.com] has joined #bitcoin-core-dev 19:34 < sipa> echeveria: possibly! 19:40 -!- marc_pango [~marc_pang@111.198.237.144] has joined #bitcoin-core-dev 19:42 -!- Chris_Stewart_5 [~chris@unaffiliated/chris-stewart-5/x-3612383] has joined #bitcoin-core-dev 19:45 -!- Sinclair6 [sinclair6@gateway/vpn/privateinternetaccess/sinclair6] has quit [Ping timeout: 260 seconds] 20:03 -!- justanotheruser [~justanoth@unaffiliated/justanotheruser] has quit [Ping timeout: 245 seconds] 20:04 -!- Chris_Stewart_5 [~chris@unaffiliated/chris-stewart-5/x-3612383] has quit [Ping timeout: 260 seconds] 20:21 -!- ula [~ula@b2b-78-94-11-194.unitymedia.biz] has quit [Quit: KVIrc 4.2.0 Equilibrium http://www.kvirc.net/] 20:27 -!- AaronvanW [~AaronvanW@unaffiliated/aaronvanw] has joined #bitcoin-core-dev 20:31 -!- AaronvanW [~AaronvanW@unaffiliated/aaronvanw] has quit [Ping timeout: 248 seconds] 21:01 -!- grafcaps [~haroldbr@50.90.83.229] has quit [Ping timeout: 240 seconds] 21:05 -!- justanotheruser [~justanoth@unaffiliated/justanotheruser] has joined #bitcoin-core-dev 21:08 -!- Krellan [~Krellan@2601:640:4000:9258:18ab:eec7:63e:b0fa] has quit [Read error: Connection reset by peer] 21:09 -!- Krellan [~Krellan@2601:640:4000:9258:18ab:eec7:63e:b0fa] has joined #bitcoin-core-dev 21:14 -!- grafcaps [~haroldbr@50.90.83.229] has joined #bitcoin-core-dev 21:18 < kallewoof> Looks like it checks one more block than suggested. `if (pindex->nHeight < chainActive.Height()-nCheckDepth) break;` should probably be `<=`. 21:20 -!- Emcy [~Emcy@unaffiliated/emcy] has quit [Read error: Connection reset by peer] 21:36 -!- Empact [~empact@192-195-80-238.PUBLIC.monkeybrains.net] has quit [] 21:45 -!- Empact [~empact@192-195-80-238.PUBLIC.monkeybrains.net] has joined #bitcoin-core-dev 21:46 -!- nullptr| [~nullptr|@ip-94-113-103-134.net.upcbroadband.cz] has quit [Ping timeout: 245 seconds] 21:52 < sipa> kallewoof: agree 21:53 -!- nullptr| [~nullptr|@ip-94-113-103-134.net.upcbroadband.cz] has joined #bitcoin-core-dev 22:21 -!- grafcaps [~haroldbr@50.90.83.229] has quit [Ping timeout: 256 seconds] 22:27 -!- AaronvanW [~AaronvanW@unaffiliated/aaronvanw] has joined #bitcoin-core-dev 22:28 < bitcoin-git> [bitcoin] kallewoof opened pull request #13428: validation: check the specified number of blocks (off-by-one) (master...validation-off-by-one) https://github.com/bitcoin/bitcoin/pull/13428 22:29 < bitcoin-git> [bitcoin] Empact opened pull request #13429: Return the script type from Solver (master...solver-return) https://github.com/bitcoin/bitcoin/pull/13429 22:29 -!- victorSN [~victorSN@ipc-hosting.de] has quit [Remote host closed the connection] 22:29 -!- rockhouse [~rockhouse@unaffiliated/rockhouse] has quit [Remote host closed the connection] 22:32 -!- AaronvanW [~AaronvanW@unaffiliated/aaronvanw] has quit [Ping timeout: 260 seconds] 22:50 < gmaxwell> sipa: you created a 32-byte version of the specialized 1-way SSE4 asm? 23:07 -!- Emcy [~Emcy@unaffiliated/emcy] has joined 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