XBT_DEBUG("Copying %zu bytes from %p to %p", buff_size, tmpbuff, comm->dst_buff_);
memcpy_private(comm->dst_buff_, tmpbuff, private_blocks);
XBT_DEBUG("Copying %zu bytes from %p to %p", buff_size, tmpbuff, comm->dst_buff_);
memcpy_private(comm->dst_buff_, tmpbuff, private_blocks);