rocm-systems/projects/rdc/example/config_example.cc

#include <unistd.h>

#include <chrono>
#include <iostream>
#include <thread>

#include "rdc/rdc.h"

int main() {
  rdc_gpu_group_t group_id;
  rdc_status_t result;
  bool standalone = false;
  rdc_handle_t rdc_handle;
  uint32_t count = 0;
  rdc_config_setting_list_t settings_list;
  rdc_config_setting_t setting;
  uint64_t watts;

  char hostIpAddress[] = {"localhost:50051"};
  char group_name[] = {"group1"};

  // Select the embedded mode and standalone mode dynamically.
  std::cout << "Start rdci in: \n";
  std::cout << "0 - Embedded mode \n";
  std::cout << "1 - Standalone mode \n";
  while (!(std::cin >> standalone)) {
    std::cout << "Invalid input.\n";
    std::cin.clear();
    std::cin.ignore();
  }
  std::cout << std::endl;
  std::cout << (standalone ? "Standalone mode selected.\n" : "Embedded mode selected.\n");

  // Init the rdc
  result = rdc_init(0);

  if (result != RDC_ST_OK) {
    std::cout << "Error initializing RDC. Return: " << rdc_status_string(result) << std::endl;
    goto cleanup;
  } else {
    std::cout << "RDC Initialized.\n";
  }

  if (standalone) {  // standalone
    result = rdc_connect(hostIpAddress, &rdc_handle, nullptr, nullptr, nullptr);
    if (result != RDC_ST_OK) {
      std::cout << "Error connecting to remote rdcd. Return: " << rdc_status_string(result)
                << std::endl;
      goto cleanup;
    }
  } else {  // embedded
    result = rdc_start_embedded(RDC_OPERATION_MODE_AUTO, &rdc_handle);
    if (result != RDC_ST_OK) {
      std::cout << "Error starting embedded RDC engine. Return: " << rdc_status_string(result)
                << std::endl;
      goto cleanup;
    }
  }

  // Now we can use the same API for both standalone and embedded
  // Get the list of devices in the system
  uint32_t gpu_index_list[RDC_MAX_NUM_DEVICES];
  result = rdc_device_get_all(rdc_handle, gpu_index_list, &count);
  if (result != RDC_ST_OK) {
    std::cout << "Error to find devices on the system. Return: " << rdc_status_string(result);
    goto cleanup;
  }
  if (count == 0) {
    std::cout << "No GPUs find on the sytem ";
    goto cleanup;
  } else {
    std::cout << count << " GPUs found in the system.\n";
  }

  // Create the group
  result = rdc_group_gpu_create(rdc_handle, RDC_GROUP_EMPTY, group_name, &group_id);
  if (result != RDC_ST_OK) {
    std::cout << "Error creating group. Return: " << rdc_status_string(result);
    goto cleanup;
  }
  std::cout << "Created the GPU group " << group_id << std::endl;

  // Add all GPUs to the group
  for (uint32_t i = 0; i < count; i++) {
    result = rdc_group_gpu_add(rdc_handle, group_id, gpu_index_list[i]);  // Add GPU 0
    if (result != RDC_ST_OK) {
      std::cout << "Error adding group. Return: " << rdc_status_string(result);
      goto cleanup;
    }
    rdc_device_attributes_t attribute;
    result = rdc_device_get_attributes(rdc_handle, gpu_index_list[i], &attribute);
    if (result != RDC_ST_OK) {
      std::cout << "Error get GPU attribute. Return: " << rdc_status_string(result);
      goto cleanup;
    }
    std::cout << "Add GPU " << gpu_index_list[i] << ":" << attribute.device_name << " to group "
              << group_id << std::endl;
  }

  setting.type = RDC_CFG_POWER_LIMIT;
  // Our targeted value is 195 Watts, which will be converted into Microwatts inside of
  // rdc_config_set
  setting.target_value = 195;
  result = rdc_config_set(rdc_handle, group_id, setting);
  if (result != RDC_ST_OK) {
    std::cout << "Error set config RDC_CFG_POWER_LIMIT, Return: " << rdc_status_string(result)
              << std::endl;
    goto cleanup;
  }

  result = rdc_config_get(rdc_handle, group_id, &settings_list);
  if (result != RDC_ST_OK) {
    std::cout << "Error get config, Return: " << rdc_status_string(result) << std::endl;
    goto cleanup;
  }

  // Prompt user to change amd-smi to other value, and watch rdc config change it back

  std::cout << "Config before wait:" << std::endl;

  result = rdc_config_get(rdc_handle, group_id, &settings_list);
  if (result != RDC_ST_OK) {
    std::cout << "Error get config, Return: " << rdc_status_string(result) << std::endl;
    goto cleanup;
  }

  std::cout << "The config will keep the power limit to 195 Watts" << std::endl;
  std::cout << "You can change the power limit using amd-smi, the RDC config module should be able "
               "to detect it and set it back"
            << std::endl;
  std::cout << "Waiting 3 minutes before exit ..." << std::endl;
  std::this_thread::sleep_for(std::chrono::minutes(3));

  result = rdc_config_clear(rdc_handle, group_id);
  if (result != RDC_ST_OK) {
    std::cout << "Error clear config, Return: " << rdc_status_string(result) << std::endl;
    goto cleanup;
  }

//... clean up
cleanup:
  std::cout << "Cleaning up.\n";

  result = rdc_group_gpu_destroy(rdc_handle, group_id);
  if (result != RDC_ST_OK) {
    std::cout << "Error delete GPU group. Return: " << rdc_status_string(result);
  }
  std::cout << "Deleted the GPU group " << group_id << std::endl;

  if (standalone)
    rdc_disconnect(rdc_handle);
  else
    rdc_stop_embedded(rdc_handle);
  rdc_shutdown();
  return result;
}