BUtil is header-only collection of clean C++ bindings for MPI. It's meant to make writing C++ MPI programs more productive and safe.
One unique feature of BUtil is a more intuitive declarative point-to-point syntax. To send the variable value from rank 0 to rank 1, you can write:
BUtil::message(value)(0)->to(1);A simple bi-directional exchange reduction looks like this:
template <typename T, typename Fn>
T reduce_recursive(T& value, size_t size, const Fn& fn) {
if (size == 1)
return value;
size_t radius = size / 2;
T exchange_value = value;
for (size_t i = 0; i < radius; i++) {
BUtil::message(exchange_value)(i)->to(i+radius);
}
T saved_value = exchange_value;
exchange_value = value;
for (size_t i = 0; i < radius; i++) {
BUtil::message(exchange_value)(i+radius)->to(i);
}
if (BUtil::rank() < radius) {
saved_value = exchange_value;
}
value = fn(value, saved_value);
return reduce_recursive(value, radius, fn);
}To use BUtil, just add BUtil to your CPLUS_INCLUDE_PATH. For example:
[xiii@e2649efe9413 src]$ git clone https://github.com/BenBrock/BUtil.git
[xiii@e2649efe9413 BUtil]$ cd BUtil
[xiii@e2649efe9413 BUtil]$ pwd
/home/xiii/src/BUtil
[xiii@e2649efe9413 BUtil]$ export CPLUS_INCLUDE_PATH=$CPLUS_INCLUDE_PATH:/home/xiii/src/BUtilThen just compile your programs while including the BUtil/BUtil.hpp header file.
BUtil currently wraps point-to-point communication, broadcast, allreduce, and reduce.
#include <BUtil/BUtil.hpp>
int main(int argc, char** argv) {
BUtil::init();
int val;
assert(BUtil::nprocs() >= 4);
if (BUtil::rank() == 0) {
val = 12;
}
BUtil::message(val)(0)->to(1);
BUtil::message(val)(0)->to(2);
BUtil::message(val)(0)->to(3);
printf("Rank %d now has value %d\n", BUtil::rank(), val);
BUtil::finalize();
return 0;
}#include <BUtil/BUtil.hpp>
int main(int argc, char** argv) {
BUtil::init();
printf("Hello! I'm rank %lu/%lu\n", BUtil::rank(), BUtil::nprocs());
constexpr size_t n = 1024;
std::vector<int> vec(n, BUtil::rank());
auto reduced_vec = BUtil::allreduce(vec, MPI_SUM);
BUtil::finalize();
}
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