def convert_to_bytes(mem_str):
    """Convert a memory specification, potentially with M or G, into bytes.
    """
    if str(mem_str)[-1].upper().endswith("G"):
        return int(round(float(mem_str[:-1]) * 1024 * 1024))
    elif str(mem_str)[-1].upper().endswith("M"):
        return int(round(float(mem_str[:-1]) * 1024))
    else:
        return int(round(float(mem_str)))