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722018-05-06T05:50:03 <fanquake> Anyone want to throw an ACK onto #13093, pretty trivial backport to get 0.15 Qt depends building again on macOS
732018-05-06T05:50:05 <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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992018-05-06T09:36:39 <murrayn> utACK, I'm not able to test it.
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1042018-05-06T09:54:09 <promag> #13160 <- is this considered bug fix? also backport? needs release note?
1052018-05-06T09:54:11 <gribble> https://github.com/bitcoin/bitcoin/issues/13160 | Unlock spent outputs by promag · Pull Request #13160 · bitcoin/bitcoin · GitHub
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1602018-05-06T12:16:04 <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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2212018-05-06T14:31:04 <booyah> -Copyright (C) 2009-2017 The Bitcoin developers
2222018-05-06T14:31:05 <booyah> -Copyright (C) 2009-2017 The Bitcoin Core developers
2232018-05-06T14:31:07 <booyah> +Copyright (C) 2009-2018 The Bitcoin developers
2242018-05-06T14:31:16 <booyah> just fyi. in other project. in https://github.com/Bitcoin-ABC/bitcoin-abc/commit/d29d325e97eeff3feac456d1014e00d5d697fe9f#diff-9e9f66b5b2833c022b0408b81a17cfd9R516
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2402018-05-06T15:15:51 <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 ?
2412018-05-06T15:16:09 <jojeyh> if i am, i think something is wrong
2422018-05-06T15:18:55 <jojeyh> the block hash printed out does not match the block where the txid is
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2552018-05-06T16:00:09 <provoostenator> fanquake: done. You may return the favor by testing #12404 :-)
2562018-05-06T16:00:11 <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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2582018-05-06T16:01:18 <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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2652018-05-06T16:09:04 <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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3322018-05-06T19:14:44 <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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3372018-05-06T19:32:40 <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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3392018-05-06T19:34:52 <sipa> eh
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3412018-05-06T19:35:08 <provoostenator> Totally wrong?
3422018-05-06T19:35:17 <sipa> blocks are written to more frequently (every block), where index/chainstate only when the cache fills up
3432018-05-06T19:35:40 <sipa> blocks and index are generally never read
3442018-05-06T19:36:03 <sipa> (blocks are read for rescan and serving to peers; index is only read at startup)
3452018-05-06T19:36:28 <sipa> chainstate is read/write and sorta random access, due to leveldb most of the writes are sequential
3462018-05-06T19:38:12 <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.
3472018-05-06T19:39:57 <sipa> much RAM
3482018-05-06T19:40:16 <sipa> run with large dbcache
3492018-05-06T19:40:47 <sipa> if your dbcache is 6G or so, there are no ransom access reads or weites at all
3502018-05-06T19:41:20 <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.
3512018-05-06T19:43:23 <sipa> yes
3522018-05-06T19:43:29 <sipa> get 8G or so
3532018-05-06T19:43:55 <sipa> storing the chain itself in RAM is useless
3542018-05-06T19:43:55 <sipa> it's not accessed during sync
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3562018-05-06T19:48:07 <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 :-)
3572018-05-06T19:48:40 <sipa> bitcoin core won't even use more than 16
3582018-05-06T19:48:48 <sipa> lock contention because worse than the gains
3592018-05-06T19:49:34 <sipa> i doubt it matters much if you use more than 8
3602018-05-06T19:56:54 <provoostenator> And it doesn't use GPU, right?
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3622018-05-06T19:57:23 <sipa> nope
3632018-05-06T20:00:18 <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...
3642018-05-06T20:00:36 <sipa> if your dbcache is big enough, disk doesn't matter at all
3652018-05-06T20:01:01 <sipa> you're configuring dbcache as large as possible on each?
3662018-05-06T20:01:20 <provoostenator> Oh ok, I'll stick to the first three then (with massive dbcache).
3672018-05-06T20:01:24 <sipa> it won't automatically use more than 450M unless instructed
3682018-05-06T20:01:46 <sipa> numbers would be interesting, though
3692018-05-06T20:02:05 <provoostenator> Any branch other than master you're interested in?
3702018-05-06T20:03:35 <sipa> if dbcache is not sufficiently large to fit the entire sync in ram, random access read speed of disk does start mattering
3712018-05-06T20:04:08 <provoostenator> These machines all have about 60 GB of RAM, so I'll set -dbcache=50000
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3732018-05-06T20:09:50 <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.
3742018-05-06T20:10:06 <gmaxwell> provoostenator: EC2 has terrible terrible terrible IO latency in general.
3752018-05-06T20:10:29 <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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3772018-05-06T20:10:36 <gmaxwell> (similar for most other VPS providers)
3782018-05-06T20:10:40 <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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3802018-05-06T20:12:02 <provoostenator> I used -dbcache=8000 back then https://medium.com/provoost-on-crypto/historical-bitcoin-core-client-performance-c5f16e1f8ccb
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3822018-05-06T20:12:28 <sipa> well verify that it isn't actually flushing
3832018-05-06T20:12:50 <provoostenator> How do I reduce the log output to only show flushes?
3842018-05-06T20:12:58 <sipa> (you'll see the cache size field in the UodateTip line drop to ~0)
3852018-05-06T20:13:03 <gmaxwell> you can tell from the updatetip lies.
3862018-05-06T20:13:08 <gmaxwell> er lines
3872018-05-06T20:13:16 <provoostenator> :-)
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3902018-05-06T20:15:39 <sipa> (sorrry for typos, in a plane, bad lag)
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3982018-05-06T20:37:36 <provoostenator> Clock started at 20:30 UTC. The t2.2xlarge just crossed the 200K block line and is slightly ahead of the other two.
3992018-05-06T20:38:20 <spudowiar> provoostenator: Do one with Bitcoin-ABC :P
4002018-05-06T20:38:39 <spudowiar> I would say do Ethereum but... :)
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4022018-05-06T20:40:50 <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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4042018-05-06T20:41:42 <spudowiar> Apparently Ethereum is validation-resistant
4052018-05-06T20:41:57 <spudowiar> I wonder how Anduck's sync is getting on
4062018-05-06T20:42:13 <sipa> he gave up afaik, but this is getting pretty off topic
4072018-05-06T20:42:41 * spudowiar is a bad influence :)
4082018-05-06T20:42:47 <provoostenator> Indeed, I'll post the result tomorrow morning.
4092018-05-06T20:45:33 <spudowiar> provoostenator: There's no networking difference between instances, is there?
4102018-05-06T20:47:32 <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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4152018-05-06T20:56:35 <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.
4162018-05-06T20:57:22 <spudowiar> nice
4172018-05-06T20:57:23 <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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4192018-05-06T21:02:08 <jojeyh> i had to stop running an eth node cuz it made my laptop completely unusable
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4412018-05-06T21:36:56 <phantomcircuit> provoostenator, you cant actually fully validate ethereum anymore
4422018-05-06T21:37:15 <phantomcircuit> there's a stretch of blocks which are effectively impossible to validate on anything
4432018-05-06T21:37:31 <phantomcircuit> besides they just make up the rules randomly anyways
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4462018-05-06T21:39:41 <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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4492018-05-06T21:43:30 <provoostenator> Just created #blockchain-sync, let's move there.
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4532018-05-06T21:49:52 <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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4552018-05-06T21:52:37 <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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