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Author Topic: [ANN] Bitcoin blockchain data torrent  (Read 196761 times)
shorena
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January 14, 2016, 02:29:13 PM
 #421

-story-
Now my points:

 - there are computers with slower CPU. Keep this in mind. My case was extreme, but it's just proof, that CPU is also very important during downloading the blockchain, and people having problems with slow downloads perhaps have probelem with CPU, not network.

Yes, the overal speed depends on more than just bandwith.

- precomputation is just reasonable. Why everyone should compute the same blocks every time they start a new node?

You either used the "bootstrap.dat" in which case you did not safe any computation time, but rather wasted it by seperating download and verification. From the times you states and "precomputation" however I assume you downloaded a preverified blockchain. This is naturally faster, because you dont do all the work. Thus the comparisson is invalid and you need to trust the other party to not have messed with the blockchain.

You should verifiy the blocks to avoid this exact problem, trusting someone else. The same way you verify the binaries you download or the signed message you receive.

- if you prepare "certified" blockchain (can be GPG signed, etc.), you will show the people that you CARE about them, and about their time, and freedom of choice of downloading method. This is important for people that are hesitating about running a bitcoin daemon.

Thanks for reading.

Which will require you to trust that person and their ability to secure their PGP key. People are not hesitating to run a full node because of the initial time it takes, but because of the constant time it needs to download and verify data. If it would just be 1-3 days (relativly modern desktop/laptop computer) it would not be an issue.

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January 16, 2016, 09:37:59 PM
 #422


You either used the "bootstrap.dat" in which case you did not safe any computation time, but rather wasted it by seperating download and verification. From the times you states and "precomputation" however I assume you downloaded a preverified blockchain. This is naturally faster, because you dont do all the work. Thus the comparisson is invalid and you need to trust the other party to not have messed with the blockchain.

You should verifiy the blocks to avoid this exact problem, trusting someone else. The same way you verify the binaries you download or the signed message you receive.

That's exactly my point - why would I have needed trust someone else, if I had had the opportunity to download pre-verified blockchain as a package, certified by bitcoin.org ? That's just giving the people another way of getting bitcoin node up and running very fast. Precomputing means not only wasted CPU cycles, but also HDD operations, as there was reported that every block requires much more HDD transfer, than just size of the blocks.

There still will be option to run bitcoind from scratch, for any people that just want to "fire and forget", and that is good.
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January 16, 2016, 11:33:02 PM
 #423

January 11th 2016 blockchain full download
~~~~~~~~~~~~~~~~~~~~~~~~~
Here I report my most recent performance as it will help others to decide what hardware is sufficient. 
It was to a VBOX virtual machine in linux on a quad-core i5 throttled to <75% x 4cpu cores.
Download of the whole blockchain from block 1 to present took about 2 days.  /.bitcoin/ is now about 65GB
2009 to 2013 parts of the blockchain maxed out the 4x cpu usage.
After that it slowed down, with 4x cpu usage decreased from about 95% x 4 x 2.3 GHz to (4 x 2.3 GHz about 40% of the time).
I suspect that the most recent 40GB of the blockchain were synching at a rate limited by my HDD rw speed and seek time, so a faster HDD such as a SSD would be the best available speedup, and might get a full blockchain download down to less that 40 hours.  What have others been seeing?

I don't think that the original bootstrap.dat is much help now as it only does the "easy" third at the start of the blockchain.

I was considering running the bitcoin core of a hard drive on a raspbery pi and transferrring the data over afterward to my laptop.

Would this save power? It only has to power a hard drive, raspberry pi and WiFi adapter.

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January 17, 2016, 09:40:36 AM
 #424

Definitely no for BTC.

For the whole month of August I had my quad-core B2 raspberry pi trying to download and sort the whole blockchain to its compiled-from-src bitcoin-qt.  It crashed and required bitcoin-qt -reindex several times and in one month of usage never completed the necessary first -reindex task.  It seemed to get slower and slower as the number of weeks remaining decreased to 50 wk, (synched up to mid-2014) and eventually I started using a spare i5 instead, which overtook the rPi in a couple of days.

In 2016, I have this rPi being an unobtanium-qt node and a couple of other altcoins too.  They are all a bit underused but seem to have faster confirmation times than BTC and be better suited to (if my neighbours were to pay pocket money for mowing the lawn).  I've just tested an unobtanium electrum-uno lightweight wallet which showed "pending" within the same minute as sending a test transaction from the rPi node via the international UNO blockchain to .. the other PC across my desk. 

If you are serious about power saving then try something like this by all means, but read around to avoid the various scamcoins and proceeds-of-crime coins which are around.

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