How to make concurrent calls to bitcoin core rpc?

Bitcoin Asked by Isaac Chen on August 22, 2020

I am trying to call getBlock for 100k blocks, but it is too slow to call them sequentially. This is what I am trying. I have a full node of bitcoin core running. I set the -rpcthreads=100 and -rpcworkqueue=100, and I use js to make Promise.all([multiple rpc calls]). To my understanding, rpcthreads allows concurrent calls, but maybe I misunderstood it. I expected the time it takes to run 2 getblock to be similar of running 1. However, I am not seeing a huge performance increase (running 2 roughly takes double the time). What is the correct way to make bitcoin core accept concurrent rpc requests? Thanks!

my bitcoin core config: -server -rpcuser=un -rpcpassword=pw -txindex=1 -rpcthreads=100 -rpcworkqueue=100

my attempt to make it concurrent (client being a wrapper class around the rpc api.):

const before =;
await Promise.all([
const afterAll =;

console.log('time for all');
console.log(afterAll - before); 

One Answer

I would assume the issue is not Bitcoin Core, even with default RPC settings I do see noticeable increase in client performance when using async/await (C# library). My suggestion is to investigate how the client code handles the RPC request/response + block parsing.

Answered by TGollowitsch on August 22, 2020

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