rocm-systems/tests/featuretests/profiler/discretetests/api/multithreaded_test.cpp

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#include <hip/hip_runtime.h>
#include <rocprofiler.h>

#include <cassert>
#include <functional>
#include <iostream>
#include <thread>
#include <vector>

#include "utils/test_utils.h"

/** \mainpage ROC Profiler API Test
 *
 * \section introduction Introduction
 *
 * The goal of this test is to test ROCmTools APIs from multiple threads
 * and verify if each API succeeds and multiple contexts are collected and
 * printed.
 *
 * An empty kernel is launched on multiple threads and profiling context is
 * collected and printed from each thread.
 */


// function to check profiler API status
auto CheckApi = [](rocprofiler_status_t status) {
  if (status != ROCPROFILER_STATUS_SUCCESS) {
    std::cout << "ROCmTools API Error" << std::endl;
  }
  assert(status == ROCPROFILER_STATUS_SUCCESS);
};

// empty kernel
__global__ void kernel() { printf("empty kernel\n"); }

// callback function to dump profiler data
void FlushCallback(const rocprofiler_record_header_t* record,
                   const rocprofiler_record_header_t* end_record, rocprofiler_session_id_t session_id,
                   rocprofiler_buffer_id_t buffer_id) {
  while (record < end_record) {
    if (!record) break;
    if (record->kind == ROCPROFILER_PROFILER_RECORD) {
      const rocprofiler_record_profiler_t* profiler_record =
          reinterpret_cast<const rocprofiler_record_profiler_t*>(record);
      size_t name_length;
      CheckApi(rocprofiler_query_kernel_info_size(ROCPROFILER_KERNEL_NAME, profiler_record->kernel_id,
                                                &name_length));
      const char* kernel_name_c = static_cast<const char*>(malloc(name_length * sizeof(char)));
      CheckApi(rocprofiler_query_kernel_info(ROCPROFILER_KERNEL_NAME, profiler_record->kernel_id,
                                           &kernel_name_c));
      int gpu_index = profiler_record->gpu_id.handle;
      uint64_t start_time = profiler_record->timestamps.begin.value;
      uint64_t end_time = profiler_record->timestamps.end.value;
      printf(
          "Kernel Info:\n\tGPU Index: %d\n\tKernel Name: %s\n\tStart "
          "Time: "
          "%lu\n\tEnd Time: %lu\n",
          gpu_index, kernel_name_c, start_time, end_time);
    }
    CheckApi(rocprofiler_next_record(record, &record, session_id, buffer_id));
  }
}

// launches an empty kernel in profiler context
void KernelLaunch() {
  // run empty kernel
  kernel<<<1, 1>>>();
  hipDeviceSynchronize();
}

int main(int argc, char** argv) {
  // Get the system cores
  int num_cpu_cores = GetNumberOfCores();

  // create as many threads as number of cores in system
  std::vector<std::thread> threads(num_cpu_cores);

  // inititalize profiler by creating rocmtool object
  CheckApi(rocprofiler_initialize());

  // Counter Collection with timestamps
  rocprofiler_session_id_t session_id;
  std::vector<const char*> counters;
  counters.emplace_back("SQ_WAVES");

  CheckApi(rocprofiler_create_session(ROCPROFILER_KERNEL_REPLAY_MODE, &session_id));

  rocprofiler_buffer_id_t buffer_id;
  CheckApi(rocprofiler_create_buffer(session_id, FlushCallback, 0x9999, &buffer_id));

  rocprofiler_filter_id_t filter_id;
  rocprofiler_filter_property_t property = {};
  CheckApi(rocprofiler_create_filter(session_id, ROCPROFILER_COUNTERS_COLLECTION,
                                   rocprofiler_filter_data_t{.counters_names = &counters[0]},
                                   counters.size(), &filter_id, property));

  CheckApi(rocprofiler_set_filter_buffer(session_id, filter_id, buffer_id));

  // activating profiler session
  CheckApi(rocprofiler_start_session(session_id));

  // launch kernel on each thread
  for (int n = 0; n < num_cpu_cores; ++n) {
    threads[n] = std::thread(KernelLaunch);
  }

  // wait for all kernel launches to complete
  for (int n = 0; n < num_cpu_cores; ++n) {
    threads[n].join();
  }

  // deactivate session
  CheckApi(rocprofiler_terminate_session(session_id));

  // dump profiler data
  CheckApi(rocprofiler_flush_data(session_id, buffer_id));

  // destroy session
  CheckApi(rocprofiler_destroy_session(session_id));

  // finalize profiler by destroying rocmtool object
  CheckApi(rocprofiler_finalize());
  return 0;
}