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CHARM is a C++ runtime system for scaling and improving applications performance on chiplet-based processors.

You must have a 64-bit Linux system with the following installed to build CHARM.

• Build
  • CMake >= 2.8.12
• Compiler
  • GCC > 4.8
• External:
  • libpfm
  • MPI
  • pthread
• optional
  • libnuma
  • gperftool

Unlike Grappa and Ring, which promote a unified shared memory model, Charm emphasizes coordinated data distribution and task division among processes. It addresses not just NUMA architectures but also the heterogeneity of partitioned L3 caches in chiplet-based processors.

You can use run() to capture the whole process you want to run. Use all_do() to spawn the same task on all cores just like what you do in SPMD. Use call() to perform a remote process call.

void run([]{ /*your codes*/ });
void all_do([]{ /*your works*/ });

void call(GlobalAddress<T> gt, [](T* t){} );
auto f = call(GlobalAddress<T> gt, [](T* t){} );
T result = f.get() // this will block explicitly just like C++11 future

void call(int which_core, [](){} );
auto f = call(int which_core, [](){} );
T result = f.get() // this will block explicitly just like C++11 future

#include <iostream>
#include <vector>
#include <cstdio>
#include "charm.h"

int x;

int main(int argc, char* argv[]){
  CHARM_Init(&argc, &argv);
  run([]{
    all_do([]{
      x=0;
      if(thread_rank() == 0){
        auto gx = make_global(0, 1, &x);
        call(gx, [](int *x){
           sync_printf("hello world", (*x));
        });//call
      }
    });//all_do
  });//run
  CHARM_Finalize();
  return 0;
}