#include <iostream>
#include <hip/hip_runtime.h>

#define HIP(e) \
if (hipError_t err = (e); err != hipSuccess) { \
	std::cerr << __FILE__ << ":" << __LINE__ << " " << err << "\n"; \
	exit(1); \
}

int main(void) {

	size_t n = 1024 * 1024;
	double *p;

	HIP(hipMallocManaged(&p, sizeof(double) * n, hipMemAttachGlobal));
	HIP(hipDeviceSynchronize());
	
	for (size_t i = 0; i < n; ++i) {
		p[i] = i;
	}
	
	HIP(hipDeviceSynchronize());

	return 0;
}