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From: Tomas <tomas@tomasvdw.nl>
To: Johnson Lau <jl2012@xbt.hk>,
	"bitcoin-dev" <bitcoin-dev@lists.linuxfoundation.org>
Subject: Re: [bitcoin-dev] Using a storage engine without UTXO-index
Date: Sat, 08 Apr 2017 21:56:18 +0200	[thread overview]
Message-ID: <1491681378.2454247.938587616.7199D633@webmail.messagingengine.com> (raw)
In-Reply-To: <6F1E6FB6-1342-4BD6-BF83-A160C1A7CD34@xbt.hk>


> I don’t fully understand your storage engine. So the following deduction
> is just based on common sense.
> 
> a) It is possible to make unlimited number of 1-in-100-out txs
> 
> b) The maximum number of 100-in-1-out txs is limited by the number of
> previous 1-in-100-out txs
> 
> c) Since bitcrust performs not good with 100-in-1-out txs, for anti-DoS
> purpose you should limit the number of previous 1-in-100-out txs. 
> 
> d) Limit 1-in-100-out txs == Limit UTXO growth
> 
> I’m not surprised that you find an model more efficient than Core. But I
> don’t believe one could find a model that doesn’t become more efficient
> with UTXO growth limitation.

My efficiency claims are *only* with regards to order validation. If we
assume all transactions are already pre-synced and verified, bitcrust's
order validation is very fast, and (only slightly) negatively effected
by input-counts.

Most total time is spend during base load script validation, and UTXO
growth is the definitely the limiting factor there, as the model here
isn't all that different from Core's.


> Maybe you could try an experiment with regtest? Make a lot 1-in-100-out
> txs with many blocks, then spend all the UTXOs with 100-in-1-out txs.
> Compare the performance of bitcrust with core. Then repeat with
> 1-in-1-out chained txs (so the UTXO set is always almost empty)
> 

Again, this really depends on whether we focus on full block validation,
in which case the 100-1, 1-100 distinction will be the similar to Core,
or only regard order validation, in which case Bitcrust will have this
odd reversal. 


> One more question: what is the absolute minimum disk and memory usage in
> bitcrust, compared with the pruning mode in Core?

As bitcrust doesn't support this yet, I cannot give accurate numbers,
but I've provided some numbers estimates earlier in the thread.


Rereading my post and these comments, I may have stepped on some toes
with regards to SegWit's model. I like SegWit (though I may have a
slight preference for BIP140), and I understand the reasons for the
"discount", so this was not my intention. I just think that the reversal
of costs during peak load order validation is a rather interesting
feature of using spend-tree  based validation. 

Tomas


  reply	other threads:[~2017-04-08 19:56 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-04-06 22:12 [bitcoin-dev] Using a storage engine without UTXO-index Tomas
2017-04-06 23:38 ` Eric Voskuil
2017-04-07  0:17   ` Tomas
2017-04-08 22:37     ` Eric Voskuil
2017-04-08 23:58       ` Tomas
2017-04-11  1:44         ` Eric Voskuil
2017-04-11  8:43           ` Tomas
2017-04-11  9:41             ` Eric Voskuil
2017-04-11 10:04               ` Tomas
     [not found] ` <CAAS2fgTEMCkDWdhCWt1EsUrnt3+Z_8m+Y1PTsff5Rc0CBnCKWQ@mail.gmail.com>
2017-04-07  0:48   ` Tomas
2017-04-07  1:09     ` Gregory Maxwell
2017-04-07  1:29       ` Tomas
2017-04-07 18:52         ` Tom Harding
2017-04-07 19:42           ` Gregory Maxwell
2017-04-08 18:27             ` Tom Harding
2017-04-08 19:23               ` Tomas
2017-04-07  7:55 ` Marcos mayorga
2017-04-07  8:47   ` Tomas
2017-04-07 14:14     ` Greg Sanders
2017-04-07 16:02       ` Tomas
2017-04-07 18:18 ` Gregory Maxwell
2017-04-07 18:39   ` Bram Cohen
2017-04-07 19:55     ` Eric Voskuil
2017-04-07 21:44       ` Tomas
2017-04-07 23:51         ` Eric Voskuil
2017-04-07 21:14     ` Tomas
2017-04-08  0:44       ` Gregory Maxwell
2017-04-08  7:28         ` Tomas
2017-04-08 19:23           ` Johnson Lau
2017-04-08 19:56             ` Tomas [this message]
2017-04-08 20:21               ` Johnson Lau
2017-04-08 20:42                 ` Tomas
2017-04-08 22:12                 ` Gregory Maxwell
2017-04-08 22:34                   ` Tomas
2017-04-08 21:22     ` Troy Benjegerdes

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