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e18c302 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 | # Cold Start Benchmark
The [benchmark.sh script](./benchmark.sh) is a bash script to compare the cold-start time of using the Powertools for AWS Lambda (Python) 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 core utilities (`Metrics`, `Logger`, `Tracer`), while the other one will not.
Please note that this requires the [SAM CLI](https://github.com/aws/aws-sam-cli) version 1.2.0 or later.
## Usage
> **NOTE**: This script is expected to run in Unix-based systems only, and can incur charges on your AWS account.
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 2.5 minutes to ensure data propagates 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.
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