void ConductExperiment(uint64_t bytes, int iterations, api::Context& ctx1, api::Context& ctx2, const std::string& type_as_string) {
auto data = generate<Type>(bytes, 1, 100);
common::ThreadPool pool;
for (int i = 0; i < iterations; i++) {
StatsTimer<true> write_timer;
pool.Enqueue([&data, &ctx1, &write_timer]() {
auto stream = ctx1.GetNewCatStream();
auto writers = stream->OpenWriters();
assert(writers.size() == 2);
write_timer.Start();
auto& writer = writers[1];
for (auto& s : data) {
writer(s);
}
writer.Close();
writers[0].Close();
write_timer.Stop();
});
StatsTimer<true> read_timer;
pool.Enqueue([&ctx2, &read_timer]() {
auto stream = ctx2.GetNewCatStream();
auto readers = stream->OpenReaders();
assert(readers.size() == 2);
auto& reader = readers[0];
read_timer.Start();
while (reader.HasNext()) {
reader.Next<Type>();
}
read_timer.Stop();
});
pool.LoopUntilEmpty();
std::cout << "RESULT"
<< " datatype=" << type_as_string
<< " size=" << bytes
<< " write_time=" << write_timer
<< " read_time=" << read_timer
<< std::endl;
}
}
void ExperimentAllPairs(
api::Context& ctx, const std::string& type_as_string) {
for (size_t src = 0; src < ctx.num_workers(); ++src) {
for (size_t tgt = 0; tgt < ctx.num_workers(); ++tgt) {
// transmit data from worker src -> tgt: only send data if we are
// tgt, but as tgt receive from all.
auto stream = ctx.GetNewCatStream();
// write phase
StatsTimer<true> write_timer(true);
{
auto writers = stream->OpenWriters();
if (ctx.my_rank() == src) {
auto data = Generator<Type>(g_bytes);
auto& writer = writers[tgt];
while (data.HasNext()) {
writer(data.Next());
}
}
}
write_timer.Stop();
// read phase
StatsTimer<true> read_timer(true);
{
auto reader = stream->OpenCatReader(true);
while (reader.HasNext()) {
reader.Next<Type>();
}
}
read_timer.Stop();
size_t read_microsecs = read_timer.Microseconds();
read_microsecs =
ctx.AllReduce(read_microsecs, common::maximum<size_t>());
size_t write_microsecs = write_timer.Microseconds();
write_microsecs =
ctx.AllReduce(write_microsecs, common::maximum<size_t>());
if (ctx.my_rank() == 0) {
std::cout
<< "RESULT"
<< " datatype=" << type_as_string
<< " size=" << g_bytes
<< " src=" << src << " tgt=" << tgt
<< " write_time=" << write_microsecs
<< " read_time=" << read_microsecs
<< " write_speed_MiBs="
<< (g_bytes / write_microsecs * 1000000 / 1024 / 1024)
<< " read_speed_MiBs="
<< (g_bytes / read_microsecs * 1000000 / 1024 / 1024)
<< std::endl;
}
}
}
}
void ExperimentFull(
api::Context& ctx, const std::string& type_as_string) {
// transmit data to all workers.
auto stream = ctx.GetNewCatStream();
// write phase
StatsTimer<true> write_timer(true);
{
auto writers = stream->OpenWriters();
auto data = Generator<Type>(g_bytes);
while (data.HasNext()) {
Type value = data.Next();
for (size_t tgt = 0; tgt < ctx.num_workers(); ++tgt) {
writers[tgt](value);
}
}
}
write_timer.Stop();
// read phase
StatsTimer<true> read_timer(true);
{
auto reader = stream->OpenCatReader(true);
while (reader.HasNext()) {
reader.Next<Type>();
}
}
read_timer.Stop();
size_t read_microsecs = read_timer.Microseconds();
read_microsecs =
ctx.AllReduce(read_microsecs, common::maximum<size_t>());
size_t write_microsecs = write_timer.Microseconds();
write_microsecs =
ctx.AllReduce(write_microsecs, common::maximum<size_t>());
uint64_t host_volume = ctx.num_workers() * g_bytes;
uint64_t total_volume = ctx.num_workers() * ctx.num_workers() * g_bytes;
if (ctx.my_rank() == 0) {
std::cout
<< "RESULT"
<< " datatype=" << type_as_string
<< " size=" << g_bytes
<< " write_time=" << write_microsecs
<< " read_time=" << read_microsecs
<< " write_speed_MiBs="
<< (g_bytes / write_microsecs * 1000000 / 1024 / 1024)
<< " read_speed_MiBs="
<< (g_bytes / read_microsecs * 1000000 / 1024 / 1024)
<< " host_write_speed_MiBs="
<< (host_volume / write_microsecs * 1000000 / 1024 / 1024)
<< " host_read_speed_MiBs="
<< (host_volume / read_microsecs * 1000000 / 1024 / 1024)
<< " total_write_speed_MiBs="
<< (total_volume / write_microsecs * 1000000 / 1024 / 1024)
<< " total_read_speed_MiBs="
<< (total_volume / read_microsecs * 1000000 / 1024 / 1024)
<< std::endl;
}
}
void ConductExperiment(uint64_t bytes, int iterations,
api::Context& ctx0, api::Context& ctx1, api::Context& ctx2,
const std::string& type_as_string) {
// prepare file with random data
auto data0 = generate<Type>(bytes / 2, 1, 100);
auto data1 = generate<Type>(bytes / 2, 1, 100);
std::vector<data::File> files;
files.reserve(3);
{
files.emplace_back(ctx0.GetFile());
auto writer0 = files[0].GetWriter();
for (auto& d : data0)
writer0(d);
files.emplace_back(ctx1.GetFile());
auto writer1 = files[1].GetWriter();
for (auto& d : data1)
writer1(d);
files.emplace_back(ctx2.GetFile());
auto writer2 = files[2].GetWriter();
}
// worker 0 and worker 1 hold 50% each
// worker 0 keeps 2/3 of his data, sends 1/3 to worker 1
// worker 1 keeps first 1/3 of his data, sends 2/3 to worker 2
// worker 2 receives 2/3 from worker 1
// afterwards everybody holds 33% of the data
std::vector<std::vector<size_t> > offsets;
offsets.push_back({ (size_t)(2 * data0.size() / 3), data0.size(), data0.size() });
offsets.push_back({ 0, (size_t)(data1.size() / 3), data1.size() });
offsets.push_back({ 0, 0, 0 });
std::vector<std::shared_ptr<data::CatStream> > streams;
streams.push_back(ctx0.GetNewCatStream());
streams.push_back(ctx1.GetNewCatStream());
streams.push_back(ctx2.GetNewCatStream());
std::vector<StatsTimer<true> > read_timers(3);
std::vector<StatsTimer<true> > write_timers(3);
common::ThreadPool pool;
for (int i = 0; i < iterations; i++) {
for (int id = 0; id < 3; id++) {
pool.Enqueue([&files, &streams, &offsets, &read_timers, &write_timers, id]() {
write_timers[id].Start();
streams[id]->Scatter<Type>(files[id], offsets[id]);
write_timers[id].Stop();
auto reader = streams[id]->OpenCatReader(true);
read_timers[id].Start();
while (reader.HasNext()) {
reader.Next<Type>();
}
read_timers[id].Stop();
});
}
pool.LoopUntilEmpty();
std::cout << "RESULT"
<< " datatype=" << type_as_string
<< " size=" << bytes
<< " write_time_worker0=" << write_timers[0].Microseconds()
<< " read_time_worker0=" << read_timers[0].Microseconds()
<< " write_time_worker1=" << write_timers[1].Microseconds()
<< " read_time_worker1=" << read_timers[1].Microseconds()
<< " write_time_worker2=" << write_timers[2].Microseconds()
<< " read_time_worker2=" << read_timers[2].Microseconds()
<< std::endl;
}
}