Thanks for the response. I actually tried the SPV blockstore on the local
machine. Still compared to bitcoind, it's dramatically slower. I actually
linked it to the bitcoind running localhost (so technically no physical
networking takes place), yet still it takes like an hour to sync.
Is there a way I could find where the bottle-neck is coming from?
On Friday, January 5, 2018 at 4:27:09 PM UTC+1, Andreas Schildbach wrote:
>
> Could be an issue with storing the pruned chain in a database not
> scaling well. I don't know because I never used this mode ... maybe
> others can tell.
>
> I'd try SPVBlockStore temporarly to see if that is much faster (it
> should).
>
>
> On 12/21/2017 07:38 PM, Nasser G. wrote:
> > Hi Everyone,
> >
> > I have a bit of a dilemma here. I'm trying to download the full
> > blockchain and use it to generate checkpoint and wallet-restore files.
> > The problem is that when I start the whole thing,
> > the download-speed rarely reaches 1MB/s (in pulses, not consistently),
> > and the every 24 hours or so, the app crashes. The exception originally
> > given was "GC Overhead Limit Exceeded", then when I
> > increased the java memory to around 6GB, now it's "Java running out of
> > heap"ish. (Please note that MySQL query cache is set to 768MB).
> >
> >
> >
> > This is the code I'm running as we speak:
> >
> >
> > // This function starts the blockchain operation
> > public boolean StartOperation()
> > {
> > // Get the NetParamrs
> > this._netParamsForBitcoinJ = MainNetParams.get();
> >
> > // Create our BlockStore file
> > try
> > {
> > _ourBlockStore = new
> > MySQLFullPrunedBlockStore(_netParamsForBitcoinJ,
> > 1500,
> >
> "localhost",
> >
> > "<BLOCKSTORE-DB-NAME>",
> >
> > "<USERNAME>",
> >
> > "<PASSWORD>");
> > }
> > catch (BlockStoreException exc)
> > {
> > return false;
> > }
> >
> > try
> > {
> > _ourBlockChain = new
> > FullPrunedBlockChain(_netParamsForBitcoinJ, _ourBlockStore);
> > }
> > catch (BlockStoreException blockStoreException)
> > {
> > return false;
> > }
> >
> > // We launch our peer-group
> > _ourPeerGroup = new PeerGroup(_netParamsForBitcoinJ,
> > _ourBlockChain);
> > _ourPeerGroup.addPeerDiscovery(new
> > DnsDiscovery(_netParamsForBitcoinJ));
> > _ourPeerGroup.setMaxConnections(250);
> > _ourPeerGroup.setMaxPeersToDiscoverCount(250);
> >
> > // We start our peer-group
> > _ourPeerGroup.start();
> > _ourPeerGroup.startBlockChainDownload(new
> > PeerDataEventListenerEx(this)
> > {
> > @Override
> > public void onBlocksDownloaded(Peer peer, Block block,
> > FilteredBlock fb, int i)
> > {
> > // Call super...
> > super.onBlocksDownloaded(peer, block, fb, i);
> > }
> >
> > @Override
> > public void onChainDownloadStarted(Peer peer, int i)
> > {
> > // Call super...
> > super.onChainDownloadStarted(peer, i);
> > }
> >
> > @Override
> > public List<Message> getData(Peer peer, GetDataMessage
> gdm)
> > {
> > return null;
> > }
> > });
> >
> >
> >
> > // We do need to return something... which is 'true' in this
> > case
> > return true;
> > }
> >
> >
> >
> >
> > As a comparison, I ran "bitcoind" on the same machine, took seven hours
> > to fully synchronize, at a constant rate of 9MB/s (on a 100Mbps
> > connection).
> > The machine in question has an Intel i5 Quad-Core, with 8GB RAM and
> > 500GB SSD, running Ubuntu 16.
> >
> >
> > Thanks in advance,
> > Nasser
> >
> >
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