Performance

Performant system

Responsive (fast)

Stable (doesn't explode)

... under a heavy workload

Why?

More and more partners ask for SLAs on response times
(or more transparency)

It improves the quality of our product

We need to scale

We need to be profitable and it reduces costs

How do we measure it?

Performance tests

Performance testing is a non-functional software testing technique that determines how the stability, speed, scalability, and responsiveness of an application holds up under a given workload.

Apps
(or anything else)

Prometheus

https://k6.io

https://monitoring.prod.oina.ws - Load testing dashboard

How to write a performance test?

Engineering / Performance

k6 tests are simple TypeScript scripts

https://gitlab.com/swan-io/commons/performance-tests

export const options: Options = {
  stages: [
    { duration: "10s", target: 3 },
    { duration: "30s", target: 3 },
    { duration: "10s", target: 0 },
  ],
  tags: {
    namespace: env.NAMESPACE,
  },
};

const graphqlQuery = graphql(`
  query ProjectInfoById($id: ID!) {
    projectInfoById(id: $id) {
      __typename
      id
      ...
    }
  }
`);

export default function () {
  const projectId = getRandomProjectId();
  const response = sendGqlRequest(urls.unauthenticated, graphqlQuery, {
    id: projectId,
  });

  check(response, {
    "status is 200 and has no error": (r) =>
      r.status === 200 && r.body.errors === undefined,
  });
}