Hi All, Has anybody perhaps had any luck with using "arm64" architecture for Lambdas? I was thinking that perhaps Api construct with its DefaultFunctionProps like below could be a place to use it (as below), but I cannot find in in any documentation. Has anybody had any insights? :

import { Architecture } from "@aws-cdk/aws-lambda";
...
  app.setDefaultFunctionProps({
    timeout: 120,
    memorySize: 256,
    architecture: Architecture.arm64,
    ....

Yeah, this works for me

import { Architecture } from '@aws-cdk/aws-lambda';

// default to ARM architecture but allow override if we're in a region that doesn't support it
const architecture = process.env.LAMBDA_ARCHITECTURE === 'ARM_64' ? Architecture.ARM_64 : Architecture.X86_64;

export default function main(app: <http://sst.App|sst.App>): void {
  app.setDefaultFunctionProps({
    runtime: 'nodejs14.x',
    architectures: [architecture],
  })
  ...
}

Ross, thanks so much! Works like a charm 🙂👍

Good stuff

@Ross Coundon do you happen to know how to check which regions support ARM_64? I tried the following to test things in us-east-1 and still seem to be getting x86_64

Not programmatically, the press release document does mention which though

Thanks. Was able to find that now and it looks like it should be available in US East. Not sure yet why it’d keep defaulting new functions to old architecture. Will have to keep playing it with a bit

I don't think it's the default, I think you have to specify

Thanks Ross. I may have presumed

process.env.LAMBDA_ARCHITECTURE

was something that the region set/dictated. Is this something you are setting manually within the account in addition to updating the stack index with that code?

We set that env var in our own stack. We used to default to the ARM_64 arch but then discovered it wasn't supported everywhere, so we set it in Seed according to what's available in the deployed region. We actually default to X86_64 as we know that's supported everywhere i.e.

const architecture = process.env.LAMBDA_ARCHITECTURE === 'ARM_64' ? Architecture.ARM_64 : Architecture.X86_64;

Ah, ok. Thanks again Ross.

@Ross Coundon are you seeing a good performance boost/cost savings with arm64?