Web3jSpeedTest.java

import org.web3j.protocol.Web3j;
import org.web3j.protocol.core.DefaultBlockParameterNumber;
import org.web3j.protocol.ipc.UnixIpcService;

import java.io.IOException;
import java.time.Duration;
import java.time.Instant;

public class Web3jSpeedTest {

    public static void main(String[] args) throws IOException {
        if (args.length != 3) {
            System.err.println("Give three arguments: IPC-PATH START-BLOCK END-BLOCK");
            return;
        }

        String path = args[0];
        Long start = Long.parseLong(args[1]);
        Long end = Long.parseLong(args[2]);

        UnixIpcService service = new UnixIpcService(path);
        Web3j web3j = Web3j.build(service);

        Instant started = Instant.now();
        int n = 0;

        for (Long block = start; block < end; block++) {
            System.out.print("" + block + " ");
            System.out.flush();

            web3j.ethGetBlockByNumber(new DefaultBlockParameterNumber(block), true).send();

            n++;
        }

        System.out.println(" done");

        Instant finished = Instant.now();
        double elapsed = Duration.between(started, finished).toMillis() / 1000.0;

        System.out.println("" + n + " blocks in " + elapsed + " seconds");
    }
}