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Ethereum clients initial sync benchmark
Syncing Ethereum blockchain head-on by fetching every block and replaying every transaction is impractical. That’s why different full nodes utilize clever techniques to speed up the initial sync and get up to speed in a reasonable time.
According to Ethernodes, Etherum mainnet is dominated by Geth (55.7%), Parity Ethereum (31.5%), so we’ll discuss these two. All tests are done in October 2018 on a $30/mo dedicated server with the following config:
2.4 GHz CPU with 8 cores
16 GB of RAM
250 GB SSD
1 Gbit network
Geth (also known as go-ethereum) is written in golang and uses Google’s LevelDB as a storage backend. The default sync mode is called fast, it downloads all the needed data in parallel:
A few hours into the sync, a message saying “Database compacting, degraded performance” starts to appear. The first one is at 4 hours 13 minutes mark and it gets worse after that. Geth ends up spending 4 hours 19 minutes (¹⁄₈ of the total time) completely halted by LevelDB compaction. After headers and receipts have finished downloaded, state sync finished without interruptions.
A few minutes after the last state entry was downloaded, the node appeared fully synced.
The final time is 1 day 10 hours. The database size is 130.9 GB.
Parity syncs in warp mode by default, which works like this:
This makes the node usable after about 4 hours. You can interact with the blockchain and query the recent state and blocks that came after the snapshot with the older blocks unavailable until they are processed.
The final time is 1 day 6 hours 32 minutes. The database size is 125.6 GB.
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