timer_transmitter_rdma.cpp

/*
Copyright (c) 2024, Hammurabi Mendes.
All rights reserved.

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      may be used to endorse or promote products derived from this software without
      specific prior written permission.

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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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 */

#include <iostream>
#include <unistd.h>

#include <thread>
#include <mutex>

#include <array>

#include "networking.h"
#include "ibutils.hpp"

#include "utils/TimeHolder.hpp"

using std::thread;
using std::recursive_mutex;

using std::array;

using std::cin;
using std::cout;
using std::cerr;
using std::endl;

constexpr uint64_t number_operations = 100000;

IBContext context(0, 1);

char server_name[128];
bool server;

#define SYNC_PORT 50135

void server_or_client() {
    array<RDMAMemory *, 128> incoming_memory;
    array<RDMAMemory *, 128> outgoing_memory;

    for(int i = 0; i < incoming_memory.size(); i++) {
        incoming_memory[i] = new RDMAMemory(&context, 4096);
        outgoing_memory[i] = new RDMAMemory(&context, 4096);
    }

    IBQueuePair queue_pair(&context);
    IBTransmitter transmitter(&context, &queue_pair, 0);

    // Synchronize
    struct QPInfo {
        uint32_t number;
        uint16_t lid;
        RDMAMemoryLocator locator;
    };

    QPInfo qpinfo_outgoing;
    QPInfo qpinfo_incoming;

    qpinfo_outgoing.number = queue_pair.queue_pair->qp_num;
    qpinfo_outgoing.lid = context.port_information.lid;
    qpinfo_outgoing.locator = RDMAMemoryLocator(incoming_memory[0]);

    cout << "(Me) QP number = " << qpinfo_outgoing.number << " lid = " << qpinfo_outgoing.lid << endl;

    volatile uint64_t *incoming_data = reinterpret_cast<uint64_t *>(incoming_memory[0]->get_buffer());
    uint64_t *outgoing_data = reinterpret_cast<uint64_t *>(outgoing_memory[0]->get_buffer());
    RDMAMemoryLocator *remote_memory = &qpinfo_incoming.locator;

    *incoming_data = 0;

    if(server) {
        int server_socket = create_server(SYNC_PORT);

        int client_socket = accept_client(server_socket);

        send(client_socket, &qpinfo_outgoing, sizeof(struct QPInfo), 0);
        recv(client_socket, &qpinfo_incoming, sizeof(struct QPInfo), 0);
    }
    else {
        int server_socket = connect_server(server_name, SYNC_PORT);

        recv(server_socket, &qpinfo_incoming, sizeof(struct QPInfo), 0);
        send(server_socket, &qpinfo_outgoing, sizeof(struct QPInfo), 0);
    }

    cout << "(Other) QP number = " << qpinfo_incoming.number << " lid = " << qpinfo_incoming.lid << endl;

    queue_pair.setup(&context, qpinfo_incoming.number, qpinfo_incoming.lid);

    Synchronizer synchronizer{1};

    *outgoing_data = 0x0042;
    sprintf((char *) (outgoing_data + 1), "Hello %s!\n", server ? "client" : "server");

    transmitter.rdma_write(outgoing_memory[0], 0, 4096, remote_memory, IBV_SEND_SIGNALED, nullptr, &synchronizer);

    while(synchronizer.get_number_operations_left() > 0) {
        context.completion_queues->flush_send_completion_queue();
    }

    while(*incoming_data != 0x0042) {
    }

    cout << (char *) (incoming_data + 1) << endl;

    *incoming_data = 0;

    if(server) {
        // Wait for client's last message
        while(*incoming_data != 0xbeef) {
        }
    }
    else {
        TimeHolder timer;

        for(uint64_t iteration = 0; iteration < number_operations - 1; iteration++) {
            sprintf((char *) outgoing_memory[iteration % outgoing_memory.size()]->get_buffer(), "Hello world %lu!\n", iteration);

            transmitter.rdma_write(outgoing_memory[iteration % outgoing_memory.size()], 0, 4096, remote_memory);
        }

        // Send client's last message
        outgoing_data = reinterpret_cast<uint64_t *>(outgoing_memory[(number_operations - 1) % outgoing_memory.size()]->get_buffer());
        *outgoing_data = 0xbeef;

        synchronizer.reset(1);

        transmitter.rdma_write(outgoing_memory[(number_operations - 1) % outgoing_memory.size()], 0, 4096, remote_memory, IBV_SEND_SIGNALED, nullptr, &synchronizer);

        while(synchronizer.get_number_operations_left() > 0) {
            context.completion_queues->flush_send_completion_queue();
        }

        long nanosecond_difference = timer.tick();

        double message_rate = ((double) (number_operations * 1000000000ULL)) / nanosecond_difference;
        double bandwidth = ((double) (number_operations * 4096)) / (1024 * 1024) / (((double) nanosecond_difference) / 1000000000ULL);

        printf("Rate: %.2f messages/s\nBandwidth: %.2f MB/s\n", message_rate, bandwidth);
    }

    cout << "done" << endl;
}

int main(int argc, char **argv) {
    if(argc > 1) {
        cout << "Starting as client" << endl;
        server = false;

        strncpy(server_name, argv[1], 128);
    }
    else {
        cout << "Starting as server" << endl;
        server = true;
    }

    server_or_client();

    return 0;
}