为何免费版AWS Lambda并发实例仅100而非标称的1000？

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亚马逊官方说明免费计划默认支持1000个Lambda实例，但我在高负载压测、同时发送多请求时，仅分配了100个实例，原本预期能分配全部1000个实例，请问这是什么原因？

SAM配置模板 #

AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31

Globals:
  Function:
    Timeout: 50
    MemorySize: 3000
    Tracing: Active
  Api:
    TracingEnabled: true

Resources:
  InferenceFunction:
    Type: AWS::Serverless::Function
    Properties:
      PackageType: Image
      Architectures:
      - x86_64
      Events:
        Inference:
          Type: Api
          Properties:
            Path: /predict
            Method: post
    Metadata:
      Dockerfile: Dockerfile
      DockerContext: ./app
      DockerTag: python3.9-v1

  ApplicationResourceGroup:
    Type: AWS::ResourceGroups::Group
    Properties:
      Name:
        Fn::Join:
        - ''
        - - ApplicationInsights-SAM-
          - Ref: AWS::StackName
      ResourceQuery:
        Type: CLOUDFORMATION_STACK_1_0
  ApplicationInsightsMonitoring:
    Type: AWS::ApplicationInsights::Application
    Properties:
      ResourceGroupName:
        Fn::Join:
        - ''
        - - ApplicationInsights-SAM-
          - Ref: AWS::StackName
      AutoConfigurationEnabled: 'true'
    DependsOn: ApplicationResourceGroup
Outputs:
  InferenceApi:
    Description: API Gateway endpoint URL for Prod stage for Inference function
    Value: !Sub "https://${ServerlessRestApi}.execute-api.${AWS::Region}.amazonaws.com/Prod/predict/"
  InferenceFunction:
    Description: Inference Lambda Function ARN
    Value: !GetAtt InferenceFunction.Arn
  InferenceFunctionIamRole:
    Description: Implicit IAM Role created for Inference function
    Value: !GetAtt InferenceFunctionRole.Arn

Lambda处理器Python代码 #

import json

from analyzer.model import Model

model_file = '/opt/ml/model'
model = Model(model_file, device="cpu")


def lambda_handler(event, context):
    sample = event['body']
    result = model(sample)

    return {
        'statusCode': 200,
        'body': json.dumps(
            {
                "predicted_label": result.value
            }
        )
    }

Dockerfile内容 #

FROM public.ecr.aws/lambda/python:3.9

COPY . .

RUN python3.9 -m pip install -r requirements.txt -t .

CMD ["app.lambda_handler"]

内容的提问来源于stack exchange，提问作者Danielto1404