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Showing content from https://docs.aws.amazon.com/lambda/latest/dg/gettingstarted-limits.html below:

Lambda quotas - AWS Lambda

New AWS accounts have reduced concurrency and memory quotas. AWS raises these quotas automatically based on your usage.

AWS Lambda is designed to scale rapidly to meet demand, allowing your functions to scale up to serve traffic in your application. Lambda is designed for short-lived compute tasks that do not retain or rely upon state between invocations. Code can run for up to 15 minutes in a single invocation and a single function can use up to 10,240 MB of memory.

It’s important to understand the guardrails that are put in place to protect your account and the workloads of other customers. Service quotas exist in all AWS services and consist of hard limits, which you cannot change, and soft limits, which you can request increases for. By default, all new accounts are assigned a quota profile that allows exploration of AWS services.

To see the quotas that apply to your account, navigate to the Service Quotas dashboard. Here, you can view your service quotas, request a quota increase, and view current utilization. From here, you can drill down to a specific AWS service, such as Lambda:

The following sections list default quotas and limits in Lambda by category.

Lambda sets quotas for the amount of compute and storage resources that you can use to run and store functions. Quotas for concurrent executions and storage apply per AWS Region. Elastic network interface (ENI) quotas apply per virtual private cloud (VPC), regardless of Region. The following quotas can be increased from their default values. For more information, see Requesting a quota increase in the Service Quotas User Guide.

For details on concurrency and how Lambda scales your function concurrency in response to traffic, see Understanding Lambda function scaling.

The following quotas apply to function configuration, deployment, and execution. Except as noted, they can't be changed.

The Lambda documentation, log messages, and console use the abbreviation MB (rather than MiB) to refer to 1,024 KB.

Function memory allocation

128 MB to 10,240 MB, in 1-MB increments.

Note: Lambda allocates CPU power in proportion to the amount of memory configured. You can increase or decrease the memory and CPU power allocated to your function using the Memory (MB) setting. At 1,769 MB, a function has the equivalent of one vCPU.

Function timeout

900 seconds (15 minutes)

Function environment variables

4 KB, for all environment variables associated with the function, in aggregate

Function resource-based policy

20 KB

Function layers

five layers

Function concurrency scaling limit

For each function, 1,000 execution environments every 10 seconds

Invocation payload (request and response)

6 MB each for request and response (synchronous)

20 MB for each streamed response (Synchronous. The payload size for streamed responses can be increased from default values. Contact Support to inquire further.)

256 KB (asynchronous)

1 MB for the total combined size of request line and header values

Bandwidth for streamed responses

Uncapped for the first 6 MB of your function's response

For responses larger than 6 MB, 2MBps for the remainder of the response

Deployment package (.zip file archive) size

50 MB (zipped, when uploaded through the Lambda API or SDKs). Upload larger files with Amazon S3.

50 MB (when uploaded through the Lambda console)

250 MB The maximum size of the contents of a deployment package, including layers and custom runtimes. (unzipped)

Container image settings size

16 KB

Container image code package size

10 GB (maximum uncompressed image size, including all layers)

Test events (console editor)

10

/tmp directory storage

Between 512 MB and 10,240 MB, in 1-MB increments

File descriptors

1,024

Execution processes/threads

1,024

The following quotas are associated with Lambda API requests.

Invocation requests per function per Region (synchronous)

Each instance of your execution environment can serve up to 10 requests per second. In other words, the total invocation limit is 10 times your concurrency limit. See Understanding Lambda function scaling.

Invocation requests per function per Region (asynchronous)

Each instance of your execution environment can serve an unlimited number of requests. In other words, the total invocation limit is based only on concurrency available to your function. See Understanding Lambda function scaling.

Invocation requests per function version or alias (requests per second)

10 x allocated provisioned concurrency

This quota applies only to functions that use provisioned concurrency.

GetFunction API requests

100 requests per second. Cannot be increased.

GetPolicy API requests

15 requests per second. Cannot be increased.

Remainder of the control plane API requests (excludes invocation, GetFunction, and GetPolicy requests)

15 requests per second across all APIs (not 15 requests per second per API). Cannot be increased.

Quotas for other services, such as AWS Identity and Access Management (IAM), Amazon CloudFront (Lambda@Edge), and Amazon Virtual Private Cloud (Amazon VPC), can impact your Lambda functions. For more information, see AWS service quotas in the Amazon Web Services General Reference, and Invoking Lambda with events from other AWS services.

Many applications involving Lambda use multiple AWS services. Because different services have different quotas for various features, it can be challenging to manage these quotas across your entire application. For example, API Gateway has a default throttle limit of 10,000 requests per second, whereas Lambda has a default concurrency limit of 1,000. Due to this mismatch, it's possible to have more incoming requests from API Gateway that Lambda can handle. You can resolve this by requesting a Lambda concurrency limit increase to match the expected level of traffic.

Load testing your application allows you to monitor the performance of your application end-to-end before deploying to production. During a load test, you can identify any quotas that may act as a limiting factor for the traffic levels you expect and take action accordingly.

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