libera #monero-dev

16 Nov 2023

Official repo: github.com/monero-project/monero || Don’t ask to ask, just ask:) || Monero GUI dev is at #monero-gui || Monero website dev is at #monero-site || Non-dev questions -> #monero, please || No fork help, you’re on your own

• 00:48
  m-relay
  <k​eepemup:matrix.org> Thanks, sech1
• 15:26
  Kapun
  After mining a block I will pass it to monerod and got error:
• 15:26
  Kapun
  `{'code': -7, 'message': 'Block not accepted'}`
• 15:26
  Kapun
  Is any change to see the reason in logs or more debug information?
• 15:37
  moneromooo
  Yes, on log level 1.
• 15:37
  moneromooo
  If you can't repro it, then no.
• 15:38
  moneromooo
  Was this mined with the node's builtin miner ?
• 15:40
  Kapun
  No, by xmrig
• 15:41
  moneromooo
  I suppose you can restart monerod with --log-level 1 --fixed-difficulty 1000 and mine another block. If it fails again, you'll know why.
• 15:41
  moneromooo
  Of course that block will be invalid, but you can "pop_block N" when done and restart without --fixed-difficulty 1000 to resync to the network.
• 15:42
  moneromooo
  It might be a broken db. In which case it'll likely be repeatable, and likely need a full resync.
• 15:44
  Kapun
  I don't want to restart production node.
• 15:44
  Kapun
  So I will make a request:
• 15:44
  Kapun
  `curl 127.0.0.1:38081/set_log_categories -d '{"categories": "*:INFO,net.p2p.msg:WARNING,net.p2p.traffic:WARNING,"}' -H 'Content-Type: application/json'`
• 15:46
  Kapun
  btw is it bad to run production mining node with prune enabling? can be latency here for accept blocks / create templates?
• 15:47
  moneromooo
  It is not bad.
• 15:48
  moneromooo
  You're unlikely to find a block in a reasonable amount of time to test this fwiw. Hence fixed difficulty.
• 15:48
  moneromooo
  I guess you can mdb_copy the db elsewhere to run a node with --fixed-difficulty 1000 on the copy.
• 15:49
  moneromooo
  (and I do mean mdb_copy, not cp)
• 15:49
  Kapun
  its fine, I rent nh power to test it.
• 15:49
  Kapun
  Some blocks accepted and some is not due to code -7, and coming to be orphaned.
• 15:50
  Kapun
  Want to know why
• 16:06
  sech1
  There is testnet for this
• 16:06
  sech1
  What's the point to rent nh power to mine real blocks if you're not sure your setup works 100%?
• 16:32
  Kapun
  Yes, you are right.
• 16:35
  Kapun
  Is adding extra data to a coinbase transaction the only method to distribute unique work to miner by a mining pool ?
• 16:35
  Kapun
  In some cases, Monero blocks contain numerous transactions in candidate, and computing the Merkle tree and hashing for each of the thousands of miners can be time-consuming.
• 16:35
  Kapun
  Is there a way to optimize this process?
• 16:43
  sech1
  Updating the extra nonce can be done in O(logN)
• 16:44
  sech1
  Coinbase tx hash changes, then you need to calculate logN hashes to update the Merkle root
• 16:57
  Kapun
  I thought you need to recalculate full merkle for each coinbase change.
• 17:23
  sech1
  I said Merkle root
• 17:23
  sech1
  And you need to recalculate it because it's a part of the hashing blob
• 18:55
  selsta
  .merges
• 18:55
  xmr-pr
  9023
• 19:01
  selsta
  .merge+ 9060 9061 9059 9056 9052 9053
• 19:01
  xmr-pr
  Added
• 19:04
  Kapun
  What is the maximum length of a fork chain in Monero? Can it be something like 8 blocks before being reorganized into the longest chain?
• 19:08
  moneromooo
  I think it can go up to 500000000. It'd have to start at the genesis block though.
• 19:08
  moneromooo
  8 blocks is valid, yes.
• 19:14
  Kapun
  And how the net decide to which one is pick as the main?
• 19:16
  moneromooo
  The one with most cumulative work.
• 19:16
  moneromooo
  If there is a draw, keep the first one you see.
• 19:39
  selsta
  .merge+ 9049
• 19:39
  xmr-pr
  Added