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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