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has quit [Quit: https://www.randolfrichardson.com/] 09:25 -!- AaronvanW [~AaronvanW@unaffiliated/aaronvanw] has joined #bitcoin-core-dev 09:34 < gmaxwell> sipa: linked on your SHANI pr is an implementation where someone else noticed the throuput/latency relationship that I noticed.. they also do a 4way and it's faster (by a small amount) than 2-way. 09:34 -!- Chris_Stewart_5 [~chris@unaffiliated/chris-stewart-5/x-3612383] has quit [Ping timeout: 240 seconds] 09:34 < gmaxwell> they get 18% speedup for 2way over 1way, and 21% for 4-way over two-way. 09:35 < gmaxwell> I'm not sure if that difference is even worth it, though perhaps throughput might increase for later cpus. 09:37 < sipa> interesting, i'll try that too 09:37 < gmaxwell> Their implementation might be interesting to look at to see if they had some smarter way of dealing with register pressure. 09:38 < sipa> another remarkable thing i noticed: the speedup of 64-specialized shani over variable length shani was close to 2x 09:38 < sipa> far higher than the ratio observed elsewhere 09:38 < sipa> gmaxwell: from what i can see it's just interleaving 09:39 < gmaxwell> (presumably register churn is why their attempt at 8-way was slower 2/4 way) 09:40 < gmaxwell> sipa: The 64-specialized saves expander work, which I guess isn't as fast with shani? or maybe it's just that shani is faster so calling overhead (which the specialized reduces) matters more? 09:41 < provoostenator> Memory management is a pain. I have a device with 1 GB RAM, trying to squeeze as much as possible out of it during IBD. Without swap, if I set it slight too high, it crashes when dbcache gets too large. With swap, it starts using the swap, which presumably defeats the purpose. Is there any way to _have_ swap but prevent dbcache from using it? 09:42 < gmaxwell> provoostenator: I doubt swapping is actually defeating the purpose, at least if it isn't doing it heavily. 09:42 < gmaxwell> The data that gets swapped is infrequently used stuff first... 09:45 < sipa> gmaxwell: SHANI has special instructions both for expansion and transform 09:45 < provoostenator> It indeed didn't seem very slow, so maybe it's not too bad in practice then. 450 MB dbcache (with maxmempool=5) seems about the max without swap. 09:51 -!- jcohen [~jcohen@pool-68-132-228-60.nycmny.fios.verizon.net] has quit [Ping timeout: 264 seconds] 09:52 -!- jcohen [~jcohen@pool-68-132-228-60.nycmny.fios.verizon.net] has joined #bitcoin-core-dev 09:57 -!- laurentmt [~Thunderbi@185.94.189.189] has joined #bitcoin-core-dev 10:01 -!- Sinclair6 [sinclair6@gateway/vpn/privateinternetaccess/sinclair6] has joined #bitcoin-core-dev 10:01 -!- berndj [~berndj@197.242.93.82] has quit [Quit: ZNC - http://znc.in] 10:04 -!- berndj [~berndj@197.242.93.82] has joined #bitcoin-core-dev 10:09 < sipa> gmaxwell: 4-way seems a bit slower here, but that may be due to less than perfectly interleaved code being emitted 10:11 -!- laurentmt1 [~Thunderbi@62.112.9.237] has joined #bitcoin-core-dev 10:12 -!- laurentmt [~Thunderbi@185.94.189.189] has quit [Ping timeout: 265 seconds] 10:12 -!- laurentmt1 is now known as laurentmt 10:16 -!- laurentmt [~Thunderbi@62.112.9.237] has quit [Ping timeout: 240 seconds] 10:18 -!- laurentmt [~Thunderbi@62.112.9.237] has joined #bitcoin-core-dev 10:33 -!- ctrlbreak [~ctrlbreak@fctnnbsc38w-47-55-95-227.dhcp-dynamic.fibreop.nb.bellaliant.net] has joined #bitcoin-core-dev 10:36 -!- Guyver2 [AdiIRC@guyver2.xs4all.nl] has quit [Read error: Connection reset by peer] 10:37 -!- Guyver2 [AdiIRC@guyver2.xs4all.nl] has joined #bitcoin-core-dev 10:38 -!- laurentmt [~Thunderbi@62.112.9.237] has quit [Quit: laurentmt] 10:49 -!- grafcaps [~haroldbr@50.90.83.229] has quit [Ping timeout: 268 seconds] 10:51 -!- grafcaps [~haroldbr@50.90.83.229] has joined #bitcoin-core-dev 10:51 -!- ToURniQue [~ToURiQue@pool-72-90-249-67.nwrknj.east.verizon.net] has joined #bitcoin-core-dev --- Log closed Sat Jun 09 11:03:28 2018 --- Log opened Sat Jun 09 11:03:38 2018 11:03 -!- kanzure_ [~kanzure@unaffiliated/kanzure] has joined #bitcoin-core-dev 11:03 -!- Irssi: #bitcoin-core-dev: Total of 244 nicks [0 ops, 0 halfops, 0 voices, 244 normal] 11:04 -!- TheV01d [thev01d@btc.mining.ga] has quit [Ping timeout: 245 seconds] 11:04 -!- ula [~ula@b2b-78-94-9-226.unitymedia.biz] has quit [Ping timeout: 245 seconds] 11:04 -!- kanzure [~kanzure@unaffiliated/kanzure] has quit [Ping timeout: 245 seconds] 11:04 -!- belcher [~belcher@unaffiliated/belcher] has quit [Ping timeout: 245 seconds] 11:04 -!- jimmysong [~Jimmy@72-48-253-51.dyn.grandenetworks.net] has quit [Ping timeout: 245 seconds] 11:04 -!- TheV01d_ is now known as TheV01d 11:04 -!- belcher [~belcher@unaffiliated/belcher] has joined 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(www.adiirc.com)] 13:28 -!- joshb[m] [joshbmatri@gateway/shell/matrix.org/x-otqowxpbyjvwzgnj] has joined #bitcoin-core-dev 13:43 -!- justanotheruser [~justanoth@unaffiliated/justanotheruser] has quit [Ping timeout: 245 seconds] 13:44 -!- Victorsueca [~Victorsue@unaffiliated/victorsueca] has quit [Read error: Connection reset by peer] 13:45 -!- herzmeister[m] [herzmeiste@gateway/shell/matrix.org/x-mdbszqmnrzmtfznz] has joined #bitcoin-core-dev 13:45 -!- ajtowns[m] [ajtownsmat@gateway/shell/matrix.org/x-hlcgxtxnghrzivcd] has joined #bitcoin-core-dev 13:45 -!- kewde[m] [kewdematri@gateway/shell/matrix.org/x-smctrzmbmubdenxb] has joined #bitcoin-core-dev 13:45 -!- squarfed[m] [squarfedma@gateway/shell/matrix.org/x-mhpbxniircspbqkv] has joined #bitcoin-core-dev 13:45 -!- stepa[m] [stepamatri@gateway/shell/matrix.org/x-xkcyrhrwadzcdwjw] has joined #bitcoin-core-dev 13:46 -!- Victorsueca [~Victorsue@unaffiliated/victorsueca] has joined #bitcoin-core-dev 13:59 -!- justanotheruser [~justanoth@unaffiliated/justanotheruser] has joined #bitcoin-core-dev 14:04 < provoostenator> I have a new theory as to why my aggresive pruning IBD branch is _slower_ than master. Namely that dirty CCoinsCacheEntry read/write doesn't perform well for very large cache sizes. See See also https://github.com/bitcoin/bitcoin/pull/12404#issuecomment-395998702 14:05 < provoostenator> (theory, still have to measure this) 14:27 < phantomcircuit> provoostenator, aggressive pruning? 14:27 -!- You're now known as kanzure 14:27 < sipa> phantomcircuit: #12404 14:27 < gribble> https://github.com/bitcoin/bitcoin/issues/12404 | Prune more aggressively during IBD by Sjors · Pull Request #12404 · bitcoin/bitcoin · GitHub 14:28 < phantomcircuit> oh 14:30 -!- AaronvanW [~AaronvanW@unaffiliated/aaronvanw] has joined #bitcoin-core-dev 14:34 < phantomcircuit> sipa, does flushing the cache still remove everything? 14:35 < sipa> yes 14:36 -!- AaronvanW [~AaronvanW@unaffiliated/aaronvanw] has quit [Ping timeout: 264 seconds] 14:37 < phantomcircuit> sipa, and there's no way to flush "upto block x" right? 14:38 < sipa> phantomcircuit: indeed, because there may have been entries created before x, but spent after x, which wouldn't be present on disk 14:39 < sipa> it is possible with the non-atomic flushing since 0.15 (which writes to disk a range of blocks rather than a single up-to-x point) 14:39 < sipa> though it's pretty complicated to reason about 14:59 < phantomcircuit> sipa, so to enable that you'd need to keep around entries that are a record of an entry being deleted? 15:01 < sipa> phantomcircuit: you actually don't 15:02 < sipa> you just need to accurately keep track of (a) the block up to which you've flushed everything and (b) the block up to which effects may be present on disk, and at startup replay the blocks' UTXO effects between those 2 15:02 < sipa> that's already implemented even 15:02 < sipa> however, once you introduce partial flushing during reorgs which may overlap etc... it becomes far more complicated 15:03 < phantomcircuit> yeah wasn't thinking about reorgs 15:04 < sipa> all of this is doable, and i think i know all the algorithms necessary to implement it 15:05 < sipa> with the goal of being able to have a background process that just periodically (and asynchronously) flushes the oldest dirty UTXO entries (and wipes the oldest non-dirty ones) 15:05 < sipa> but it's a pretty big amount of work without knowing if it'll actually speed things up :) 15:06 < phantomcircuit> sipa, i had a patch which did this, but broke consensus across reorgs 15:06 < phantomcircuit> it was a substantial speed up 15:06 < phantomcircuit> but that was a while ago, so possibly it wouldn't be as large anymore? 15:06 < sipa> since per-txout in 0.15 performance profiles of such things may have shifted drastically 15:07 < sipa> it could be less or more of a speedup now :) 15:11 < phantomcircuit> yeah 15:11 < phantomcircuit> iirc it was really simple to do 15:38 -!- jhfrontz [~Adium@c-73-23-68-28.hsd1.fl.comcast.net] has quit [Ping timeout: 276 seconds] 15:38 -!- Chris_Stewart_5 [~chris@unaffiliated/chris-stewart-5/x-3612383] has quit [Ping timeout: 256 seconds] 15:52 -!- jhfrontz [~Adium@c-73-23-68-28.hsd1.fl.comcast.net] has joined #bitcoin-core-dev 15:56 -!- andytoshi [~apoelstra@wpsoftware.net] has joined #bitcoin-core-dev 15:56 -!- andytoshi [~apoelstra@wpsoftware.net] has quit [Client Quit] 15:59 -!- andytoshi [~apoelstra@wpsoftware.net] has joined #bitcoin-core-dev 15:59 -!- andytoshi [~apoelstra@wpsoftware.net] has quit [Changing host] 15:59 -!- andytoshi [~apoelstra@unaffiliated/andytoshi] has joined #bitcoin-core-dev 15:59 -!- andytoshi [~apoelstra@unaffiliated/andytoshi] has quit [Client Quit] 16:03 -!- andytoshi [~apoelstra@wpsoftware.net] has joined #bitcoin-core-dev 16:03 -!- andytoshi [~apoelstra@wpsoftware.net] has quit [Changing host] 16:03 -!- andytoshi [~apoelstra@unaffiliated/andytoshi] has joined #bitcoin-core-dev 16:23 -!- Giszmo [~leo@pc-72-54-46-190.cm.vtr.net] has joined #bitcoin-core-dev 16:23 -!- Giszmo [~leo@pc-72-54-46-190.cm.vtr.net] has quit [Client Quit] 16:37 -!- Chris_Stewart_5 [~chris@unaffiliated/chris-stewart-5/x-3612383] has joined #bitcoin-core-dev 16:39 < phantomcircuit> sipa, the FRESH flag looks a bit confusing 16:41 < phantomcircuit> the idea is that if an entry is added and spent before a flush it's effectively a noop ? 16:41 < sipa> it just means "this entry does not exist in the parent cache, so if it is spent, we can just forget about it" 16:41 < sipa> phantomcircuit: it's *the* major performance gain our cache gives 16:41 < phantomcircuit> ok i get that 16:42 < phantomcircuit> yeah 16:43 < sipa> because it avoids entries ever hitting disk at all 16:45 -!- ToURniQue [~ToURiQue@pool-72-90-249-67.nwrknj.east.verizon.net] has quit [Quit: Leaving] 16:47 < phantomcircuit> sipa, yup i definitely get it 17:33 -!- AaronvanW [~AaronvanW@unaffiliated/aaronvanw] has joined #bitcoin-core-dev 17:38 -!- AaronvanW [~AaronvanW@unaffiliated/aaronvanw] has quit [Ping timeout: 268 seconds] 17:39 -!- unholymachine [~quassel@2601:8c:c003:9f16:e84a:2086:f1da:2b73] has joined #bitcoin-core-dev 17:40 -!- AaronvanW [~AaronvanW@unaffiliated/aaronvanw] has joined #bitcoin-core-dev 17:42 -!- promag [~promag@bl22-247-244.dsl.telepac.pt] has joined #bitcoin-core-dev 17:45 -!- AaronvanW [~AaronvanW@unaffiliated/aaronvanw] has quit [Ping timeout: 245 seconds] 18:01 -!- promag [~promag@bl22-247-244.dsl.telepac.pt] has quit [Remote host closed the connection] 18:03 -!- d9b4bef9 [~d9b4bef9@web501.webfaction.com] has quit [Remote host closed the connection] 18:04 -!- d9b4bef9 [~d9b4bef9@web501.webfaction.com] has joined #bitcoin-core-dev 18:23 -!- snickerfritz [~snickerfr@unaffiliated/snickerfritz] has quit [Quit: Leaving] 18:24 -!- snickerfritz [~snickerfr@184.75.213.134] has joined #bitcoin-core-dev 18:24 -!- snickerfritz [~snickerfr@184.75.213.134] has quit [Changing host] 18:24 -!- snickerfritz [~snickerfr@unaffiliated/snickerfritz] has joined #bitcoin-core-dev 18:40 -!- games_ [sid99242@gateway/web/irccloud.com/x-bqlfkxvxeoychbln] has joined #bitcoin-core-dev 18:46 -!- nmnkgl [~nmnkgl@c-98-234-64-218.hsd1.ca.comcast.net] has joined #bitcoin-core-dev 18:50 -!- nmnkgl [~nmnkgl@c-98-234-64-218.hsd1.ca.comcast.net] has quit [Ping timeout: 248 seconds] 18:53 -!- promag [~promag@bl22-247-244.dsl.telepac.pt] has joined #bitcoin-core-dev 18:58 -!- promag [~promag@bl22-247-244.dsl.telepac.pt] has quit [Ping timeout: 260 seconds] 19:05 -!- drexl [~drexl@cpc130676-camd16-2-0-cust445.know.cable.virginm.net] has quit [Remote host closed the connection] 19:29 -!- ohnx [notohnx@unaffiliated/ohnx] has quit [Ping timeout: 240 seconds] 19:37 -!- Randolf [~randolf@96.53.47.42] has joined #bitcoin-core-dev 19:41 -!- AaronvanW [~AaronvanW@unaffiliated/aaronvanw] has joined #bitcoin-core-dev 19:46 -!- AaronvanW [~AaronvanW@unaffiliated/aaronvanw] has quit [Ping timeout: 276 seconds] 19:48 < gmaxwell> sipa: did you look at their implementation? https://github.com/armfazh/flo-shani-aesni/blob/master/sha256/flo-shani.c 19:52 < sipa> gmaxwell: yes, just interleaving 19:54 -!- promag [~promag@bl22-247-244.dsl.telepac.pt] has joined #bitcoin-core-dev 19:58 -!- promag [~promag@bl22-247-244.dsl.telepac.pt] has quit [Ping timeout: 240 seconds] 20:30 -!- zivl_ [~zivl@2601:19a:837f:e4e1:7c31:f28f:990f:eac8] has quit [Ping timeout: 276 seconds] 20:50 -!- Chris_Stewart_5 [~chris@unaffiliated/chris-stewart-5/x-3612383] has quit [Ping timeout: 260 seconds] 20:55 -!- promag [~promag@bl22-247-244.dsl.telepac.pt] has joined #bitcoin-core-dev 20:59 -!- promag [~promag@bl22-247-244.dsl.telepac.pt] has quit [Ping timeout: 256 seconds] 21:03 -!- snickerfritz [~snickerfr@unaffiliated/snickerfritz] has quit [Quit: Leaving] 21:11 -!- unholymachine [~quassel@2601:8c:c003:9f16:e84a:2086:f1da:2b73] has quit [Remote host closed the connection] 21:40 -!- Krellan [~Krellan@2601:640:4000:9258:18ab:eec7:63e:b0fa] has joined #bitcoin-core-dev 21:42 -!- AaronvanW [~AaronvanW@unaffiliated/aaronvanw] has joined #bitcoin-core-dev 21:46 -!- AaronvanW [~AaronvanW@unaffiliated/aaronvanw] has quit [Ping timeout: 248 seconds] 21:51 -!- d9b4bef9 [~d9b4bef9@web501.webfaction.com] has quit [Remote host closed the connection] 21:52 -!- d9b4bef9 [~d9b4bef9@web501.webfaction.com] has joined #bitcoin-core-dev 21:53 -!- d9b4bef9 [~d9b4bef9@web501.webfaction.com] has quit [Remote host closed the connection] 21:53 -!- dongcarl [~dongcarl@c-24-5-70-69.hsd1.ca.comcast.net] has joined #bitcoin-core-dev 21:54 -!- d9b4bef9 [~d9b4bef9@web501.webfaction.com] has joined #bitcoin-core-dev 21:54 -!- promag [~promag@bl22-247-244.dsl.telepac.pt] has joined #bitcoin-core-dev 21:55 -!- d9b4bef9 [~d9b4bef9@web501.webfaction.com] has quit [Remote host closed the connection] 21:56 -!- d9b4bef9 [~d9b4bef9@web501.webfaction.com] has joined #bitcoin-core-dev 21:57 -!- d9b4bef9 [~d9b4bef9@web501.webfaction.com] has quit [Remote host closed the connection] 21:59 -!- promag [~promag@bl22-247-244.dsl.telepac.pt] has quit [Ping timeout: 268 seconds] 22:00 -!- d9b4bef9 [~d9b4bef9@web501.webfaction.com] has joined #bitcoin-core-dev 22:01 -!- d9b4bef9 [~d9b4bef9@web501.webfaction.com] has quit [Remote host closed the connection] 22:02 -!- d9b4bef9 [~d9b4bef9@web501.webfaction.com] has joined #bitcoin-core-dev 22:07 -!- grafcaps [~haroldbr@50.90.83.229] has quit [Ping timeout: 260 seconds] 22:46 -!- ilufang [~ilufang@vpnpool-130-126-152-202.near.illinois.edu] has joined #bitcoin-core-dev 23:08 -!- bitconner [~conner@136.24.175.89] has joined #bitcoin-core-dev 23:26 -!- ctrlbreak [~ctrlbreak@fctnnbsc38w-47-55-95-227.dhcp-dynamic.fibreop.nb.bellaliant.net] has quit [Ping timeout: 248 seconds] 23:42 -!- AaronvanW [~AaronvanW@unaffiliated/aaronvanw] has joined #bitcoin-core-dev 23:44 -!- ctrlbreak [~ctrlbreak@142.162.42.47] has joined #bitcoin-core-dev 23:47 -!- AaronvanW [~AaronvanW@unaffiliated/aaronvanw] has quit [Ping timeout: 240 seconds] 23:50 -!- Krellan [~Krellan@2601:640:4000:9258:18ab:eec7:63e:b0fa] has quit [Read error: Connection reset by peer] 23:51 -!- Krellan [~Krellan@2601:640:4000:9258:18ab:eec7:63e:b0fa] has joined #bitcoin-core-dev 23:55 -!- promag [~promag@bl22-247-244.dsl.telepac.pt] has joined #bitcoin-core-dev 23:59 -!- promag [~promag@bl22-247-244.dsl.telepac.pt] has quit [Ping timeout: 245 seconds]