03-getitem-test.py - AWS Code Sample


#!/usr/bin/env python3 # Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved. # SPDX-License-Identifier: Apache-2.0 """ Purpose Gets items out of an Amazon DynamoDB table for a specified number of iterations. The total amount of time spent retrieving items is measured and reported. When no arguments are specified, this script is run with the Boto3 client. When a DAX cluster endpoint is specified, the script uses the DAX client. Running in each mode lets you compare the performance of the two clients. """ import argparse import sys import time import amazondax import boto3 def get_item_test(key_count, iterations, dyn_resource=None): """ Gets items from the table a specified number of times. The time before the first iteration and the time after the last iteration are both captured and reported. :param key_count: The number of items to get from the table in each iteration. :param iterations: The number of iterations to run. :param dyn_resource: Either a Boto3 or DAX resource. :return: The start and end times of the test. """ if dyn_resource is None: dyn_resource = boto3.resource('dynamodb') table = dyn_resource.Table('TryDaxTable') start = time.perf_counter() for _ in range(iterations): for partition_key in range(1, key_count + 1): for sort_key in range(1, key_count + 1): table.get_item(Key={ 'partition_key': partition_key, 'sort_key': sort_key }) print('.', end='') sys.stdout.flush() print() end = time.perf_counter() return start, end if __name__ == '__main__': parser = argparse.ArgumentParser() parser.add_argument( 'endpoint_url', nargs='?', help="When specified, the DAX cluster endpoint. Otherwise, DAX is not used.") args = parser.parse_args() test_key_count = 10 test_iterations = 50 if args.endpoint_url: print(f"Getting each item from the table {test_iterations} times, " f"using the DAX client.") # Use a with statement so the DAX client closes the cluster after completion. with amazondax.AmazonDaxClient.resource(endpoint_url=args.endpoint_url) as dax: test_start, test_end = get_item_test( test_key_count, test_iterations, dyn_resource=dax) else: print(f"Getting each item from the table {test_iterations} times, " f"using the Boto3 client.") test_start, test_end = get_item_test( test_key_count, test_iterations) print(f"Total time: {test_end - test_start:.4f} sec. Average time: " f"{(test_end - test_start)/ test_iterations}.")