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Cold Start Benchmark

The benchmark.sh script is a bash script to compare the cold-start time of using the AWS Lambda Powertools in a semi-automated way. It does so by deploying two Lambda functions which both have the aws-lambda-powertools module installed. One Lambda function will import and initialize the three main utilities (Metrics, Logger, Tracer), while the other one will not.

Please note that this requires the SAM CLI version 1.2.0 or later.

Usage

To use the script, you should move into the benchmark folder and run the benchmark script:

export S3_BUCKET=code-artifact-s3-bucket

cd benchmark
./benchmark.sh

This will:

  • Deploy a CloudFormation stack using guided SAM deployment (you will need to answer a few questions).
  • Run loops to update the memory setting of the functions to force a cold start, then invoke them. This process is repeated a number of time to get more consistent results.
  • Wait for the data to propagate from CloudWatch Logs to CloudWatch Logs Insights.
  • Run a query on CloudWatch Logs insights, looking at the REPORT line from the logs.
  • Delete the CloudFormation stack.