Allow barretenberg to use all cores

packages/noir-ethereum-api/src/main.ts

@@ -2,12 +2,15 @@ import { BarretenbergBackend, ProofData, type CompiledCircuit } from '@noir-lang
 import { Noir, WitnessMap } from '@noir-lang/noir_js';
 import { promises as fs } from 'fs';
 import toml from 'toml';
+import os from 'os';
 import noir_ethereum_history_api from '../../../circuit/target/noir_ethereum_history_api.json';
 import { type Oracles, defaultOracles } from './noir/oracles/oracles.js';
 import { decodeHexString, encodeHexString } from './noir/noir_js/encode.js';
 import { abiEncode, type InputMap } from '@noir-lang/noirc_abi';
 
 export const circuit = noir_ethereum_history_api as unknown as CompiledCircuit;
+const backend = new BarretenbergBackend(circuit, { threads: os.cpus().length });
+const noir = new Noir(circuit, backend);
 
 export interface MainInputs extends InputMap {
   block_no: number;
@@ -21,8 +24,6 @@ export async function recordStorageProof(
   oracles: Oracles = defaultOracles,
   name: string
 ): Promise<boolean> {
-  const backend = new BarretenbergBackend(circuit);
-  const noir = new Noir(circuit, backend);
   const proof = await noir.generateFinalProof(input, oracles);
 
   const proofHex = decodeHexString(proof.proof);
@@ -36,8 +37,6 @@ export async function recordStorageProof(
 }
 
 export async function verifyStorageProof(proof: ProofData): Promise<boolean> {
-  const backend = new BarretenbergBackend(circuit);
-  const noir = new Noir(circuit, backend);
   return await noir.verifyFinalProof(proof);
 }