ceph/src/boost/libs/fiber/examples/hip/single_stream.cpp

   1
   2 //          Copyright Oliver Kowalke 2017.
   3 // Distributed under the Boost Software License, Version 1.0.
   4 //    (See accompanying file LICENSE_1_0.txt or copy at
   5 //          http://www.boost.org/LICENSE_1_0.txt)
   6
   7 #include <chrono>
   8 #include <cstdlib>
   9 #include <iostream>
  10 #include <memory>
  11 #include <random>
  12 #include <tuple>
  13
  14 #include <hip/hip_runtime.h>
  15
  16 #include <boost/assert.hpp>
  17 #include <boost/bind.hpp>
  18 #include <boost/intrusive_ptr.hpp>
  19
  20 #include <boost/fiber/all.hpp>
  21 #include <boost/fiber/hip/waitfor.hpp>
  22
  23 __global__
  24 void vector_add(hipLaunchParm lp, int * a, int * b, int * c, int size) {
  25     int idx = threadIdx.x + blockIdx.x * blockDim.x;
  26     if ( idx < size) {
  27         c[idx] = a[idx] + b[idx];
  28     }
  29 }
  30
  31 int main() {
  32     try {
  33         bool done = false;
  34         boost::fibers::fiber f1([&done]{
  35             std::cout << "f1: entered" << std::endl;
  36             try {
  37                 hipStream_t stream;
  38                 hipStreamCreate( & stream);
  39                 int size = 1024 * 1024;
  40                 int full_size = 20 * size;
  41                 int * host_a, * host_b, * host_c;
  42                 hipHostMalloc( & host_a, full_size * sizeof( int), hipHostMallocDefault);
  43                 hipHostMalloc( & host_b, full_size * sizeof( int), hipHostMallocDefault);
  44                 hipHostMalloc( & host_c, full_size * sizeof( int), hipHostMallocDefault);
  45                 int * dev_a, * dev_b, * dev_c;
  46                 hipMalloc( & dev_a, size * sizeof( int) );
  47                 hipMalloc( & dev_b, size * sizeof( int) );
  48                 hipMalloc( & dev_c, size * sizeof( int) );
  49                 std::minstd_rand generator;
  50                 std::uniform_int_distribution<> distribution(1, 6);
  51                 for ( int i = 0; i < full_size; ++i) {
  52                     host_a[i] = distribution( generator);
  53                     host_b[i] = distribution( generator);
  54                 }
  55                 for ( int i = 0; i < full_size; i += size) {
  56                     hipMemcpyAsync( dev_a, host_a + i, size * sizeof( int), hipMemcpyHostToDevice, stream);
  57                     hipMemcpyAsync( dev_b, host_b + i, size * sizeof( int), hipMemcpyHostToDevice, stream);
  58                     hipLaunchKernel( vector_add, dim3(size / 256), dim3(256), 0, stream, dev_a, dev_b, dev_c, size);
  59                     hipMemcpyAsync( host_c + i, dev_c, size * sizeof( int), hipMemcpyDeviceToHost, stream);
  60                 }
  61                 auto result = boost::fibers::hip::waitfor_all( stream);
  62                 BOOST_ASSERT( stream == std::get< 0 >( result) );
  63                 BOOST_ASSERT( hipSuccess == std::get< 1 >( result) );
  64                 std::cout << "f1: GPU computation finished" << std::endl;
  65                 hipHostFree( host_a);
  66                 hipHostFree( host_b);
  67                 hipHostFree( host_c);
  68                 hipFree( dev_a);
  69                 hipFree( dev_b);
  70                 hipFree( dev_c);
  71                 hipStreamDestroy( stream);
  72                 done = true;
  73             } catch ( std::exception const& ex) {
  74                 std::cerr << "exception: " << ex.what() << std::endl;
  75             }
  76             std::cout << "f1: leaving" << std::endl;
  77         });
  78         boost::fibers::fiber f2([&done]{
  79             std::cout << "f2: entered" << std::endl;
  80             while ( ! done) {
  81                 std::cout << "f2: sleeping" << std::endl;
  82                 boost::this_fiber::sleep_for( std::chrono::milliseconds( 1 ) );
  83             }
  84             std::cout << "f2: leaving" << std::endl;
  85         });
  86         f1.join();
  87         f2.join();
  88         std::cout << "done." << std::endl;
  89         return EXIT_SUCCESS;
  90     } catch ( std::exception const& e) {
  91         std::cerr << "exception: " << e.what() << std::endl;
  92     } catch (...) {
  93         std::cerr << "unhandled exception" << std::endl;
  94     }
  95         return EXIT_FAILURE;
  96 }