public inbox for bitcoindev@googlegroups.com
 help / color / mirror / Atom feed
From: Johnson Lau <jl2012@xbt.hk>
To: Tomas <tomas@tomasvdw.nl>,
	bitcoin-dev <bitcoin-dev@lists.linuxfoundation.org>
Subject: Re: [bitcoin-dev] Using a storage engine without UTXO-index
Date: Sun, 9 Apr 2017 03:23:29 +0800	[thread overview]
Message-ID: <6F1E6FB6-1342-4BD6-BF83-A160C1A7CD34@xbt.hk> (raw)
In-Reply-To: <1491636528.2474173.938219072.54C44183@webmail.messagingengine.com>


> On 8 Apr 2017, at 15:28, Tomas via bitcoin-dev <bitcoin-dev@lists.linuxfoundation.org> wrote:
>> 
> 
> I think you are being a bit harsh here . I am also clearly explaining
> the difference only applies to peak load, and just making a suggestion.
> I simply want to stress the importance of protocol / implementation
> separation as even though you are correct UTXO data is always a resource
> cost for script validation (as I also state), the ratio of different
> costs are  not necessarily *identical* across implementation. 
> 
> Note that the converse also holds: In bitcrust, if the last few blocks
> contain many inputs, the peak load verification for this block is
> slower. This is not the case in Core.
> 
> Tomas
> 

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.

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)

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


  reply	other threads:[~2017-04-08 19:23 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 [this message]
2017-04-08 19:56             ` Tomas
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

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=6F1E6FB6-1342-4BD6-BF83-A160C1A7CD34@xbt.hk \
    --to=jl2012@xbt.hk \
    --cc=bitcoin-dev@lists.linuxfoundation.org \
    --cc=tomas@tomasvdw.nl \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox