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standard C/C++ I/O in benchmark

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This commit is contained in:
Antonin Portelli 2020-10-06 17:57:00 +01:00
parent ace9cd64bb
commit acac2d6938
2 changed files with 157 additions and 4 deletions
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30
benchmarks/Benchmark_IO.cc
View File

@ -19,6 +19,31 @@ int main (int argc, char ** argv)
int64_t threads = GridThread::GetThreads();
MSG << "Grid is setup to use " << threads << " threads" << std::endl;
MSG << SEP << std::endl;
MSG << "Benchmark std C++ write" << std::endl;
MSG << SEP << std::endl;
for (int l = 4; l <= BENCH_IO_LMAX; l += 2)
{
auto mpi = GridDefaultMpi();
std::vector<int> latt = {l*mpi[0], l*mpi[1], l*mpi[2], l*mpi[3]};
MSG << "-- Local volume " << l << "^4" << std::endl;
writeBenchmark<LatticeFermion>(latt, filestem(l), stdWrite<LatticeFermion>);
}
MSG << SEP << std::endl;
MSG << "Benchmark std C++ read" << std::endl;
MSG << SEP << std::endl;
for (int l = 4; l <= BENCH_IO_LMAX; l += 2)
{
auto mpi = GridDefaultMpi();
std::vector<int> latt = {l*mpi[0], l*mpi[1], l*mpi[2], l*mpi[3]};
MSG << "-- Local volume " << l << "^4" << std::endl;
readBenchmark<LatticeFermion>(latt, filestem(l), stdRead<LatticeFermion>);
}
MSG << SEP << std::endl;
MSG << "Benchmark Lime write" << std::endl;
MSG << SEP << std::endl;
@ -27,10 +52,11 @@ int main (int argc, char ** argv)
auto mpi = GridDefaultMpi();
std::vector<int> latt = {l*mpi[0], l*mpi[1], l*mpi[2], l*mpi[3]};
std::cout << "-- Local volume " << l << "^4" << std::endl;
MSG << "-- Local volume " << l << "^4" << std::endl;
writeBenchmark<LatticeFermion>(latt, filestem(l), limeWrite<LatticeFermion>);
}
MSG << SEP << std::endl;
MSG << "Benchmark Lime read" << std::endl;
MSG << SEP << std::endl;
for (int l = 4; l <= BENCH_IO_LMAX; l += 2)
@ -38,7 +64,7 @@ int main (int argc, char ** argv)
auto mpi = GridDefaultMpi();
std::vector<int> latt = {l*mpi[0], l*mpi[1], l*mpi[2], l*mpi[3]};
std::cout << "-- Local volume " << l << "^4" << std::endl;
MSG << "-- Local volume " << l << "^4" << std::endl;
readBenchmark<LatticeFermion>(latt, filestem(l), limeRead<LatticeFermion>);
}

131
benchmarks/Benchmark_IO.hpp
View File

@ -14,13 +14,140 @@ using WriterFn = std::function<void(const std::string, Field &)> ;
template <typename Field>
using ReaderFn = std::function<void(Field &, const std::string)>;
// AP 06/10/2020: Standard C version in case one is suspicious of the C++ API
//
// template <typename Field>
// void stdWrite(const std::string filestem, Field &vec)
// {
// std::string rankStr = std::to_string(vec.Grid()->ThisRank());
// std::FILE *file = std::fopen((filestem + "." + rankStr + ".bin").c_str(), "wb");
// size_t size;
// uint32_t crc;
// GridStopWatch ioWatch, crcWatch;
// size = vec.Grid()->lSites()*sizeof(typename Field::scalar_object);
// autoView(vec_v, vec, CpuRead);
// crcWatch.Start();
// crc = GridChecksum::crc32(vec_v.cpu_ptr, size);
// std::fwrite(&crc, sizeof(uint32_t), 1, file);
// crcWatch.Stop();
// MSG << "Std I/O write: Data CRC32 " << std::hex << crc << std::dec << std::endl;
// ioWatch.Start();
// std::fwrite(vec_v.cpu_ptr, sizeof(typename Field::scalar_object), vec.Grid()->lSites(), file);
// ioWatch.Stop();
// std::fclose(file);
// size *= vec.Grid()->ProcessorCount();
// MSG << "Std I/O write: Wrote " << size << " bytes in " << ioWatch.Elapsed()
// << ", performance " << size/1024./1024./(ioWatch.useconds()/1.e6)
// << " MB/s" << std::endl;
// MSG << "Std I/O write: checksum overhead " << crcWatch.Elapsed() << std::endl;
// }
//
// template <typename Field>
// void stdRead(Field &vec, const std::string filestem)
// {
// std::string rankStr = std::to_string(vec.Grid()->ThisRank());
// std::FILE *file = std::fopen((filestem + "." + rankStr + ".bin").c_str(), "rb");
// size_t size;
// uint32_t crcRead, crcData;
// GridStopWatch ioWatch, crcWatch;
// size = vec.Grid()->lSites()*sizeof(typename Field::scalar_object);
// crcWatch.Start();
// std::fread(&crcRead, sizeof(uint32_t), 1, file);
// crcWatch.Stop();
// {
// autoView(vec_v, vec, CpuWrite);
// ioWatch.Start();
// std::fread(vec_v.cpu_ptr, sizeof(typename Field::scalar_object), vec.Grid()->lSites(), file);
// ioWatch.Stop();
// std::fclose(file);
// }
// {
// autoView(vec_v, vec, CpuRead);
// crcWatch.Start();
// crcData = GridChecksum::crc32(vec_v.cpu_ptr, size);
// crcWatch.Stop();
// }
// MSG << "Std I/O read: Data CRC32 " << std::hex << crcData << std::dec << std::endl;
// assert(crcData == crcRead);
// size *= vec.Grid()->ProcessorCount();
// MSG << "Std I/O read: Read " << size << " bytes in " << ioWatch.Elapsed()
// << ", performance " << size/1024./1024./(ioWatch.useconds()/1.e6)
// << " MB/s" << std::endl;
// MSG << "Std I/O read: checksum overhead " << crcWatch.Elapsed() << std::endl;
// }
template <typename Field>
void stdWrite(const std::string filestem, Field &vec)
{
std::string rankStr = std::to_string(vec.Grid()->ThisRank());
std::ofstream file(filestem + "." + rankStr + ".bin", std::ios::out | std::ios::binary);
size_t size, sizec;
uint32_t crc;
GridStopWatch ioWatch, crcWatch;
size = vec.Grid()->lSites()*sizeof(typename Field::scalar_object);
sizec = size/sizeof(char); // just in case of...
autoView(vec_v, vec, CpuRead);
crcWatch.Start();
crc = GridChecksum::crc32(vec_v.cpu_ptr, size);
file.write(reinterpret_cast<char *>(&crc), sizeof(uint32_t)/sizeof(char));
crcWatch.Stop();
MSG << "Std I/O write: Data CRC32 " << std::hex << crc << std::dec << std::endl;
ioWatch.Start();
file.write(reinterpret_cast<char *>(vec_v.cpu_ptr), sizec);
file.flush();
ioWatch.Stop();
size *= vec.Grid()->ProcessorCount();
MSG << "Std I/O write: Wrote " << size << " bytes in " << ioWatch.Elapsed()
<< ", performance " << size/1024./1024./(ioWatch.useconds()/1.e6)
<< " MB/s" << std::endl;
MSG << "Std I/O write: checksum overhead " << crcWatch.Elapsed() << std::endl;
}
template <typename Field>
void stdRead(Field &vec, const std::string filestem)
{
std::string rankStr = std::to_string(vec.Grid()->ThisRank());
std::ifstream file(filestem + "." + rankStr + ".bin", std::ios::in | std::ios::binary);
size_t size, sizec;
uint32_t crcRead, crcData;
GridStopWatch ioWatch, crcWatch;
size = vec.Grid()->lSites()*sizeof(typename Field::scalar_object);
sizec = size/sizeof(char); // just in case of...
crcWatch.Start();
file.read(reinterpret_cast<char *>(&crcRead), sizeof(uint32_t)/sizeof(char));
crcWatch.Stop();
{
autoView(vec_v, vec, CpuWrite);
ioWatch.Start();
file.read(reinterpret_cast<char *>(vec_v.cpu_ptr), sizec);
ioWatch.Stop();
}
{
autoView(vec_v, vec, CpuRead);
crcWatch.Start();
crcData = GridChecksum::crc32(vec_v.cpu_ptr, size);
crcWatch.Stop();
}
MSG << "Std I/O read: Data CRC32 " << std::hex << crcData << std::dec << std::endl;
assert(crcData == crcRead);
size *= vec.Grid()->ProcessorCount();
MSG << "Std I/O read: Read " << size << " bytes in " << ioWatch.Elapsed()
<< ", performance " << size/1024./1024./(ioWatch.useconds()/1.e6)
<< " MB/s" << std::endl;
MSG << "Std I/O read: checksum overhead " << crcWatch.Elapsed() << std::endl;
}
template <typename Field>
void limeWrite(const std::string filestem, Field &vec)
{
emptyUserRecord record;
ScidacWriter binWriter(vec.Grid()->IsBoss());
binWriter.open(filestem + ".bin");
binWriter.open(filestem + ".lime.bin");
binWriter.writeScidacFieldRecord(vec, record);
binWriter.close();
}
@ -31,7 +158,7 @@ void limeRead(Field &vec, const std::string filestem)
emptyUserRecord record;
ScidacReader binReader;
binReader.open(filestem + ".bin");
binReader.open(filestem + ".lime.bin");
binReader.readScidacFieldRecord(vec, record);
binReader.close();
}