aws-lambda-cpp

A C++ AWS Lambda implementation which implements the bootstrap specification for Lambda.

Published here:

https://services.mycodefu.com/c/mongodb

Serverless

The project is deployed to AWS using Serverless:
https://www.serverless.com/

Refer to the AWS guide for settings: https://www.serverless.com/framework/docs/providers/aws/guide/serverless.yml/

Tried several load tests of the solution, and found that 1024MB RAM gave the sweet spot of performance to price.
Less than 1024MB we found slower cold starts in th 2s+ range. Adding more RAM did not improve performance.

Lambda

Specification:
https://docs.aws.amazon.com/lambda/latest/dg/lambda-dg.pdf

Load Test Result for Base C++ Bootstrap Only

Following script in K6 run from an m5.2xlarge EC2 instance in the same region:

import http from 'k6/http';
import { check, sleep } from "k6";

export let options = {
    stages: [
        { duration: "5s", target: 5 },
        { duration: "5s", target: 10 },
        { duration: "5s", target: 15 },
        { duration: "5s", target: 20 },
        { duration: "5s", target: 25 },
        { duration: "5s", target: 30 },
        { duration: "5s", target: 35 },
        { duration: "5s", target: 40 },
        { duration: "5s", target: 45 },
        { duration: "5s", target: 50 },
        { duration: "60s", target: 50 },
        { duration: "60s", target: 0 }
    ]
};

export default function () {
    let res = http.get('https://services.mycodefu.com/c/cpp/hello');
    check(res, { 'status was 200': (r) => r.status == 200 });
}

Stats for roundtrip performance of C++ bootstrap lambda:

Mean (average): 13.96 ms  
Min: 8.43 ms  
Median: 13.37 ms  
p90: 16.20 ms  
p95: 18.45 ms  
Max: 200.77 ms  

Compiling MongoDB C++ Driver

http://mongocxx.org/mongocxx-v3/installation/linux/