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 72 2018-05-06T05:50:03  <fanquake> Anyone want to throw an ACK onto #13093, pretty trivial backport to get 0.15 Qt depends building again on macOS
 73 2018-05-06T05:50:05  <gribble> https://github.com/bitcoin/bitcoin/issues/13093 | [0.15] backport: depends qt patches by fanquake · Pull Request #13093 · bitcoin/bitcoin · GitHub
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 99 2018-05-06T09:36:39  <murrayn> utACK, I'm not able to test it.
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104 2018-05-06T09:54:09  <promag> #13160 <- is this considered bug fix? also backport? needs release note?
105 2018-05-06T09:54:11  <gribble> https://github.com/bitcoin/bitcoin/issues/13160 | Unlock spent outputs by promag · Pull Request #13160 · bitcoin/bitcoin · GitHub
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160 2018-05-06T12:16:04  <bitcoin-git> [bitcoin] martinus opened pull request #13176: Improve CRollingBloomFilter performance: replace modulus with FastMod (master...optimize-CRollingBloomFilter) https://github.com/bitcoin/bitcoin/pull/13176
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221 2018-05-06T14:31:04  <booyah> -Copyright (C) 2009-2017 The Bitcoin developers
222 2018-05-06T14:31:05  <booyah> -Copyright (C) 2009-2017 The Bitcoin Core developers
223 2018-05-06T14:31:07  <booyah> +Copyright (C) 2009-2018 The Bitcoin developers
224 2018-05-06T14:31:16  <booyah> just fyi.  in other project. in  https://github.com/Bitcoin-ABC/bitcoin-abc/commit/d29d325e97eeff3feac456d1014e00d5d697fe9f#diff-9e9f66b5b2833c022b0408b81a17cfd9R516
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240 2018-05-06T15:15:51  <jojeyh> am i correct in assuming that the "bestblock" field in the output from `bitcoin-cli gettxout` is the block hash of the block that includes the "txid" passed into the argument ?
241 2018-05-06T15:16:09  <jojeyh> if i am, i think something is wrong
242 2018-05-06T15:18:55  <jojeyh> the block hash printed out does not match the block where the txid is
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255 2018-05-06T16:00:09  <provoostenator> fanquake: done. You may return the favor by testing #12404 :-)
256 2018-05-06T16:00:11  <gribble> https://github.com/bitcoin/bitcoin/issues/12404 | Prune more aggressively during IBD by Sjors · Pull Request #12404 · bitcoin/bitcoin · GitHub
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258 2018-05-06T16:01:18  <provoostenator> I also got the bright idea of making my ccache larger (~/.ccache/ccache.conf) and moving it to my SSD drive...
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265 2018-05-06T16:09:04  <bitcoin-git> [bitcoin] ken2812221 opened pull request #13177: GCC-7 and glibc-2.27 compat code (master...compat) https://github.com/bitcoin/bitcoin/pull/13177
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332 2018-05-06T19:14:44  <bitcoin-git> [bitcoin] donaloconnor opened pull request #13180: Fix re-declared scoped enum as unscoped (Causes issues with some compilers) (master...06052018_unscoped_enum) https://github.com/bitcoin/bitcoin/pull/13180
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337 2018-05-06T19:32:40  <provoostenator> Am I correct that during IBD the bulk of random read/write disk activity is for /blocks/index and /chainstate? Whereas /blocks gets written in larger batches?
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339 2018-05-06T19:34:52  <sipa> eh
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341 2018-05-06T19:35:08  <provoostenator> Totally wrong?
342 2018-05-06T19:35:17  <sipa> blocks are written to more frequently (every block), where index/chainstate only when the cache fills up
343 2018-05-06T19:35:40  <sipa> blocks and index are generally never read
344 2018-05-06T19:36:03  <sipa> (blocks are read for rescan and serving to peers; index is only read at startup)
345 2018-05-06T19:36:28  <sipa> chainstate is read/write and sorta random access, due to leveldb most of the writes are sequential
346 2018-05-06T19:38:12  <provoostenator> For context, I'm trying to figure what the ultimate IBD EC2 instance would look like, in order to produce a small pruned result, which I would then copy to a low-end machine. Particularly what needs a RAM drive.
347 2018-05-06T19:39:57  <sipa> much RAM
348 2018-05-06T19:40:16  <sipa> run with large dbcache
349 2018-05-06T19:40:47  <sipa> if your dbcache is 6G or so, there are no ransom access reads or weites at all
350 2018-05-06T19:41:20  <provoostenator> The x1e.2xlarge has 244 GB RAM, so I can store the whole chain. But if > 6 GB has extremely dimishing returns I'd rather get more CPU's probably.
351 2018-05-06T19:43:23  <sipa> yes
352 2018-05-06T19:43:29  <sipa> get 8G or so
353 2018-05-06T19:43:55  <sipa> storing the chain itself in RAM is useless
354 2018-05-06T19:43:55  <sipa> it's not accessed during sync
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356 2018-05-06T19:48:07  <provoostenator> Has anyone ever plotted IBD vs. number of CPU's? I assume that flattens off at some point. EC2 can do up 72 CPUs :-)
357 2018-05-06T19:48:40  <sipa> bitcoin core won't even use more than 16
358 2018-05-06T19:48:48  <sipa> lock contention because worse than the gains
359 2018-05-06T19:49:34  <sipa> i doubt it matters much if you use more than 8
360 2018-05-06T19:56:54  <provoostenator> And it doesn't use GPU, right?
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362 2018-05-06T19:57:23  <sipa> nope
363 2018-05-06T20:00:18  <provoostenator> But a local SSD drive might? Alright, I picked four machine with 8 CPU's each and some differences otherwise: t2.2xlarge, m5.2xlarge, c5.2xlarge and i3.2xlarge. I'll let them race eachother tonight...
364 2018-05-06T20:00:36  <sipa> if your dbcache is big enough, disk doesn't matter at all
365 2018-05-06T20:01:01  <sipa> you're configuring dbcache as large as possible on each?
366 2018-05-06T20:01:20  <provoostenator> Oh ok, I'll stick to the first three then (with massive dbcache).
367 2018-05-06T20:01:24  <sipa> it won't automatically use more than 450M unless instructed
368 2018-05-06T20:01:46  <sipa> numbers would be interesting, though
369 2018-05-06T20:02:05  <provoostenator> Any branch other than master you're interested in?
370 2018-05-06T20:03:35  <sipa> if dbcache is not sufficiently large to fit the entire sync in ram, random access read speed of disk does start mattering
371 2018-05-06T20:04:08  <provoostenator> These machines all have about 60 GB of RAM, so I'll set -dbcache=50000
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373 2018-05-06T20:09:50  <provoostenator> When I did my benchmarking last year I never ticked the "allow burst above baseline" options, so I probably got nowhere near max CPU performance.
374 2018-05-06T20:10:06  <gmaxwell> provoostenator: EC2 has terrible terrible terrible IO latency in general.
375 2018-05-06T20:10:29  <gmaxwell> and it slaughters performance unless your dbcache is big enough for the whole UTXO set (perhaps around 6GB or so)
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377 2018-05-06T20:10:36  <gmaxwell> (similar for most other VPS providers)
378 2018-05-06T20:10:40  <provoostenator> Amazon seems to assume that most applications only need short CPU burst and so they make you "save" credits for these incidental burst. But obviously IBD is bit more intense.
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380 2018-05-06T20:12:02  <provoostenator> I used -dbcache=8000 back then https://medium.com/provoost-on-crypto/historical-bitcoin-core-client-performance-c5f16e1f8ccb
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382 2018-05-06T20:12:28  <sipa> well verify that it isn't actually flushing
383 2018-05-06T20:12:50  <provoostenator> How do I reduce the log output to only show flushes?
384 2018-05-06T20:12:58  <sipa> (you'll see the cache size field in the UodateTip line drop to ~0)
385 2018-05-06T20:13:03  <gmaxwell> you can tell from the updatetip lies.
386 2018-05-06T20:13:08  <gmaxwell> er lines
387 2018-05-06T20:13:16  <provoostenator> :-)
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390 2018-05-06T20:15:39  <sipa> (sorrry for typos, in a plane, bad lag)
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398 2018-05-06T20:37:36  <provoostenator> Clock started at 20:30 UTC. The t2.2xlarge just crossed the 200K block line and is slightly ahead of the other two.
399 2018-05-06T20:38:20  <spudowiar> provoostenator: Do one with Bitcoin-ABC :P
400 2018-05-06T20:38:39  <spudowiar> I would say do Ethereum but... :)
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402 2018-05-06T20:40:50  <provoostenator> Someone else is welcome to do that. Apparantly Etherehum is cloud resistant, according to a recent Noded podcast with Jameson Lopp. Due to relatively heavy I/O, if you fully validate.
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404 2018-05-06T20:41:42  <spudowiar> Apparently Ethereum is validation-resistant
405 2018-05-06T20:41:57  <spudowiar> I wonder how Anduck's sync is getting on
406 2018-05-06T20:42:13  <sipa> he gave up afaik, but this is getting pretty off topic
407 2018-05-06T20:42:41  * spudowiar is a bad influence :)
408 2018-05-06T20:42:47  <provoostenator> Indeed, I'll post the result tomorrow morning.
409 2018-05-06T20:45:33  <spudowiar> provoostenator: There's no networking difference between instances, is there?
410 2018-05-06T20:47:32  <provoostenator> I don't think networking is a bottleneck with these machines, but it could explain small differences in the beginning. Things don't get interesting until ~2015 when the UTXO set grows.
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415 2018-05-06T20:56:35  <Anduck> spudowiar: my machine ran out of space for non-pruned eth sync, got frustrated and haven't since done it again. it synced at some pace (my estimation is 4-5 weeks for full sync) with 3x ssd in raid0, with hdd would be impossible.
416 2018-05-06T20:57:22  <spudowiar> nice
417 2018-05-06T20:57:23  <Anduck> this is the 2nd test. initial one i gave up as it was clearly impossible to never get it synced
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419 2018-05-06T21:02:08  <jojeyh> i had to stop running an eth node cuz it made my laptop completely unusable
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441 2018-05-06T21:36:56  <phantomcircuit> provoostenator, you cant actually fully validate ethereum anymore
442 2018-05-06T21:37:15  <phantomcircuit> there's a stretch of blocks which are effectively impossible to validate on anything
443 2018-05-06T21:37:31  <phantomcircuit> besides they just make up the rules randomly anyways
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446 2018-05-06T21:39:41  <provoostenator> phantomcircuit: let's not go too far off topic. I'll post the result here, but unless there's a PR that can improve it, this is probably not the right place.
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449 2018-05-06T21:43:30  <provoostenator> Just created #blockchain-sync, let's move there.
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453 2018-05-06T21:49:52  <bitcoin-git> [bitcoin] donaloconnor closed pull request #13180: Fix re-declared scoped enum as unscoped (Causes issues with some compilers) (master...06052018_unscoped_enum) https://github.com/bitcoin/bitcoin/pull/13180
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455 2018-05-06T21:52:37  <bitcoin-git> [bitcoin] donaloconnor reopened pull request #13180: Fix re-declared scoped enum as unscoped (Causes issues with some compilers) (master...06052018_unscoped_enum) https://github.com/bitcoin/bitcoin/pull/13180
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