for (i = 0; i < num_procs; i++) {
src = dst = rank ^ i;
Request::sendrecv(send_ptr + send_disps[dst] * send_chunk, send_counts[dst], send_type, dst, tag,
for (i = 0; i < num_procs; i++) {
src = dst = rank ^ i;
Request::sendrecv(send_ptr + send_disps[dst] * send_chunk, send_counts[dst], send_type, dst, tag,