From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTPS id C40DE475 for ; Thu, 23 Jul 2015 17:14:33 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from mout.gmx.net (mout.gmx.net [212.227.15.18]) by smtp1.linuxfoundation.org (Postfix) with ESMTPS id C60271C8 for ; Thu, 23 Jul 2015 17:14:32 +0000 (UTC) Received: from [46.101.177.144] by 3capp-mailcom-bs04.server.lan (via HTTP); Thu, 23 Jul 2015 19:14:31 +0200 MIME-Version: 1.0 Message-ID: From: "Slurms MacKenzie" To: "Jameson Lopp" Content-Type: text/html; charset=UTF-8 Date: Thu, 23 Jul 2015 19:14:31 +0200 Importance: normal Sensitivity: Normal In-Reply-To: References: , X-UI-Message-Type: mail X-Priority: 3 X-Provags-ID: V03:K0:4n30EuvE34989VNyT+JGec9hSu4fttm3scQdtNtRQ66 Q6bX/s+irImg3FrmudZwYLAtLAjdF3iw/aHRu6QTleSgMeTzSD 6/ElVOdbRaomrYwOXYTkIoILUZV/ybcpgjIPMp7jEHteWGPE+P viGvWPmGFN7VnFvQWmfdnJ/9UGxC8meJzHXnX/SFvLq6zmEMZ/ zp1X0fkyVS/aJC/Dnwy5qGoi4QwXL8zRP0TbD3tKIkwcWGDiYj xly902IOgZg6i6V/lgnhQPk/xg4ykz3TZSfVxGh80O5RlhA4Oz 4h+tEhnP0+YypjE6Kgl8oJf1Uno X-UI-Out-Filterresults: notjunk:1;V01:K0:Xi5i4pf9fAY=:pIVYmEzZVDcZUmESJqPFqX Ypnbgps1yZ4UrNe8QMfkBY6DFHNqmUVwQ1sivTwrccWz0ZR3do9MYkBhEXAndbgxKZxTC5YuX SXmWzG0MO7t36xVdTP1UwKh/3SuzdUhBsp/4kt69Cq7vTUB1g9stKbcU7EBnnds1DwCmSRGaf mMW7sPDSsIXPpkATDiRFwtWf+V8XDoMsM0kNYQGX1aX0OKgd1upz7Idfg1E+0fiv/KUyOeO/A fUKz0Ee7EezeihDAw5cQh95R0pNlWxMujkdhuvRhce6vvI24byrhn+H3ea9Nbc7Tx/x5StuHM nN8tTbIeqNxEN7Qx5vwPnMMUIZ9Stq/l8HpwbtBzQGlnny7b3kR/u4C2jL4vFSvlURWuIE2/p E6x7P0ciSaKyOujhs3cL+WA5ayAoDKB29DDJ/B7tzefIJLPLWlXpc19wlctRdyvDKCWcVC7kh tClIZYj9tQ== X-Spam-Status: No, score=-1.2 required=5.0 tests=BAYES_00,FREEMAIL_FROM, HTML_MESSAGE, MIME_HTML_ONLY, RCVD_IN_DNSWL_NONE autolearn=no version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on smtp1.linux-foundation.org Cc: bitcoin-dev@lists.linuxfoundation.org Subject: Re: [bitcoin-dev] Bitcoin Node Speed Test X-BeenThere: bitcoin-dev@lists.linuxfoundation.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Bitcoin Development Discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 23 Jul 2015 17:14:33 -0000
The library used isn't open source, so unfortunately not. It shouldn't be too hard to replicate in python-bitcoinlib or bitcoinj though.
 
Sent: Thursday, July 23, 2015 at 6:55 PM
From: "Jameson Lopp" <jameson.lopp@gmail.com>
To: slurms@gmx.us
Cc: bitcoin-dev@lists.linuxfoundation.org
Subject: Re: [bitcoin-dev] Bitcoin Node Speed Test
Are you willing to share the code that you used to run the test?
 
- Jameson
 
On Thu, Jul 23, 2015 at 10:19 AM, slurms--- via bitcoin-dev <bitcoin-dev@lists.linuxfoundation.org> wrote:
On this day, the Bitcoin network was crawled and reachable nodes surveyed to find their maximum throughput in order to determine if it can safely support a faster block rate. Specifically this is an attempt to prove or disprove the common statement that 1MB blocks were only suitable slower internet connections in 2009 when Bitcoin launched, and that connection speeds have improved to the point of obviously supporting larger blocks.


The testing methodology is as follows:

 * Nodes were randomly selected from a peers.dat, 5% of the reachable nodes in the network were contacted.

 * A random selection of blocks was downloaded from each peer.

 * There is some bias towards higher connection speeds, very slow connections (<30KB/s) timed out in order to run the test at a reasonable rate.

 * The connecting node was in Amsterdam with a 1GB NIC.

 
Results:

 * 37% of connected nodes failed to upload blocks faster than 1MB/s.

 * 16% of connected nodes uploaded blocks faster than 10MB/s.

 * Raw data, one line per connected node, kilobytes per second http://pastebin.com/raw.php?i=6b4NuiVQ


This does not support the theory that the network has the available bandwidth for increased block sizes, as in its current state 37% of nodes would fail to upload a 20MB block to a single peer in under 20 seconds (referencing a number quoted by Gavin). If the bar for suitability is placed at taking only 1% of the block time (6 seconds) to upload one block to one peer, then 69% of the network fails for 20MB blocks. For comparison, only 10% fail this metric for 1MB blocks.
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