Cryptographic operations are 150 times slower in Jest compared to node

[naddison36]

🐛 Bug Report

When I run a JS function that does cryptographic operations on node.js is takes around 400 milliseconds. When I run the exact same JS code in a Jest test, it takes a minute.

To Reproduce

git clone https://github.com/jpmorganchase/anonymous-zether
cd anonymous-zether/packages/anonymous.js/
npm i
cd src

Then create a js file with the following code. eg commitPerfTest.js

const { GeneratorParams, FieldVector } = require("./prover/algebra.js");
const bn128 = require("./utils/bn128.js");
const params = new GeneratorParams();
params.extend(64);
const gExp = new FieldVector(Array.from({ length: 64 }).map(bn128.randomScalar));
const hExp = new FieldVector(Array.from({ length: 64 }).map(bn128.randomScalar));

const startTime = new Date();

params.commit(gExp, hExp, bn128.randomScalar());

const endTime = new Date();
console.log(`Commit took ${endTime - startTime} milliseconds`);

Run the code. On my MacBook Pro this takes around 400ms

node commitPerfTest.js

Now run the above code in a Jest test. eg commitPerf.test.js

test("commit perf test", () => {
    const { GeneratorParams, FieldVector } = require("./prover/algebra.js");
    const bn128 = require("./utils/bn128.js");
    const params = new GeneratorParams();
    params.extend(64);
    const gExp = new FieldVector(Array.from({ length: 64 }).map(bn128.randomScalar));
    const hExp = new FieldVector(Array.from({ length: 64 }).map(bn128.randomScalar));

    const startTime = new Date();

    params.commit(gExp, hExp, bn128.randomScalar());

    const endTime = new Date();
    console.log(`Commit took ${endTime - startTime} milliseconds`);
    expect(endTime - startTime).toBeLessThan(1000);
});

Now run the Jest test assuming you have Jest installed globally

jest commitPerf.test.js

On my laptop, the last params.commit(gExp, hExp, bn128.randomScalar()); line takes around 60000 milliseconds. I've also tested with Jest 23 and 22 and they also take around one minute.

Expected behavior

I'd expect Jest to add some overhead and could live with it being 2, even up to 10 times, slower than node. But 150 times slower is unworkable.

Link to repl or repo (highly encouraged)

https://github.com/jpmorganchase/anonymous-zether
Consensys/anonymous-zether#12 (comment)

envinfo

I was testing using Jest 24.9.0

System:
OS: macOS Mojave 10.14.6
CPU: (8) x64 Intel(R) Core(TM) i7-6820HQ CPU @ 2.70GHz
Binaries:
Node: 12.11.1 - ~/.nvm/versions/node/v12.11.1/bin/node
Yarn: 1.19.0 - /usr/local/bin/yarn
npm: 6.11.3 - ~/.nvm/versions/node/v12.11.1/bin/npm

[SimenB]

This is a duplicate of #5163. Adding

{
  "jest": {
    "extraGlobals": ["Math"]
  }
}

to package.json results in this:

[naddison36]

Wow, that simple config change has the test running in 600 ms now on my laptop. That's a 100x improvement! Thanks @SimenB

[github-actions]

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