# calculates throughput in gib/s from the meassured
# transfer duration (in nanoseconds) for a given element
# with the size of this given in bytes
def calc_throughput(size_bytes,time_ns):
    time_seconds = time_ns * 1e-9
    size_gib = size_bytes / (1024 ** 3)
    throughput_gibs = size_gib / time_seconds
    return throughput_gibs


# reverse array search: return index of value in array
def index_from_element(value,array):
    for (idx,val) in enumerate(array):
        if val == value: return idx
    return 0