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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