Synchronization Checkpoints · Issue #9885 · Bitcoin

21/11/2018  · It was introduced as a necessity for implementing an optimization (skipping script validation) and an unrelated denial-of-service attack (the disk of a new node being filled with low-difficulty blocks during synchronization). Since some changes in the P2P protocol (headers based synchronization) we no longer need checkpoints to do these things safely.

I ran a full sync test on an EC2 c3.2xlarge instance (8 cores, 15GB RAM). The only configuration used with bitcoind was -dbcache=8000. Here are the results: 0.13.2: 4 hours 27 mins 0.14.0-rc3: 2 hours 59 mins What’s interesting is that after block 290000 (checkpoint) 0.13 would use all available cores for validation (400-800% cpu usage on top) while 0.14 only used 1 core and hovered around 80.

Bitcoin Core now uses ‘headers-first synchronization’. This means that we first ask peers for block headers (a total of 27 megabytes, as of December 2014) and validate those. In a second stage, when the headers have been discovered, we download the blocks. However, as we already know about the whole chain in advance, the blocks can be downloaded in parallel from all available peers.

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I’m also having problems with the synchronization. it begins, but then I get this message at the bottom and it stops the sync: WARNING: no two valid MoneroPulse DNS checkpoint records were received. ive never done this before, but I’m clicking on monerod – user2745 Jun 12 ’17 at 18:48

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