AWS Compute Optimizer FAQs

Q: What is AWS Compute Optimizer?

AWS Compute Optimizer helps you identify the optimal AWS resource configurations, such as Amazon Elastic Compute Cloud (EC2) instance types, Amazon Elastic Block Store (EBS) volume configurations, task sizes of Amazon Elastic Container Service (ECS) services on AWS Fargate, and AWS Lambda function memory sizes, using machine learning to analyze historical utilization metrics. AWS Compute Optimizer provides a set of APIs and a console experience to help you reduce costs and increase workload performance by recommending the optimal AWS resources for your AWS workloads.

Q: What can I do with AWS Compute Optimizer?

AWS Compute Optimizer delivers intuitive and easily actionable AWS resource recommendations to help you quickly identify optimal AWS resources for your workloads without requiring specialized expertise or investing substantial time and money. The AWS Compute Optimizer console provides you with a global, cross-account view of all resources analyzed by AWS Compute Optimizer and recommendations so that you can quickly identify the most impactful optimization opportunities.

Q: How can I get started with AWS Compute Optimizer?

To sign up for AWS Compute Optimizer, go to the AWS Compute Optimizer console and click “opt in.” You must have an AWS account to access this service. Once you opt in, AWS Compute Optimizer immediately starts analyzing your AWS resources and starts delivering recommendations. When you first opt in AWS Compute Optimizer, it may take up to 12 hours to fully analyze the AWS resources in your account.

Q: What data does AWS Compute Optimizer use for my recommendations?

When you opt in AWS Compute Optimizer, you authorize the service to use AWS resource configuration data and CloudWatch metrics. This data is required because AWS Compute Optimizer needs to identify the resources to assess, and it needs sufficient metrics history before it makes recommendations.

Q: When should I use AWS Compute Optimizer EC2 instance type recommendations and when should I use AWS Cost Explorer EC2 Resource Rightsizing Recommendations?

Cost Explorer Resource Rightsizing Recommendations and Compute Optimizer use the same recommendation engine. Compute Optimizer delivers recommendations to help customers identify optimal EC2 instance types for their workloads. The Cost Explorer console and API surfaces a subset of these recommendations that may lead to cost savings, and augments them with customer-specific cost and savings information (such as billing information, available credits, RI and Savings Plans) to help cost-management owners quickly identify savings opportunities through infrastructure rightsizing. Compute Optimizer console and its API delivers all recommendations regardless of the cost implications. Engineering teams can use Compute Optimizer to evaluate price-performance trade-off for their workloads, receive recommendations that incorporate additional data (such as memory metrics), and evaluate projected resource utilization and performance risk.

Q: How many recommended options does AWS Compute Optimizer deliver for each AWS resource?

AWS Compute Optimizer delivers up to three resource recommended options for Amazon Elastic Compute Cloud (EC2), Amazon Elastic Block Store (EBS), and EC2 Auto Scaling groups. AWS Compute Optimizer delivers one memory size recommendation for AWS Lambda functions, and it provides one task-level CPU and memory size recommendation for Amazon Elastic Container Service (ECS) services on AWS Fargate.

Q: Does AWS Compute Optimizer deliver recommendations for all AWS resources?

AWS Compute Optimizer delivers recommendations for selected types of EC2 instances, EC2 Auto Scaling groups, EBS volumes, Amazon ECS services on AWS Fargate, and Lambda functions.

Q: How much data does AWS Compute Optimizer analyze to generate recommendations?

AWS Compute Optimizer analyzes metrics from the past 14 days to generate recommendations.

Q: How do I identify my biggest cost savings and performance improvement opportunities?

You can quickly identify and prioritize top optimization opportunities through two new sets of dashboard-level metrics: savings opportunity and performance improvement opportunity.

Savings opportunity metrics quantify the Amazon EC2, Amazon EBS, Amazon ECS services on AWS Fargate, and AWS Lambda monthly savings you can achieve at the account level, resource type level, or resource level by adopting Compute Optimizer recommendations. You can use these metrics to evaluate and prioritize cost efficiency opportunities, as well as monitor your cost efficiency over time. Performance improvement opportunity metrics quantify the percentage and number of underprovisioned resources at the account level and resource type level. You can use these metrics to evaluate and prioritize performance improvement opportunities that address resource bottleneck risks.

Q: What is enhanced infrastructure metrics?

Enhanced infrastructure metrics is a paid Compute Optimizer feature for EC2 instances that improves recommendation accuracy and relevance for workloads with monthly or quarterly utilization patterns. Upon activation of the feature, Compute Optimizer automatically ingests and analyzes up to six times more utilization metrics history than the default Compute Optimizer option (up to three months of history compared to 14 days). You can activate the feature at the organization, account, or resource level via the Compute Optimizer console or API for all existing and newly created EC2 instances and Auto Scaling groups.

Q: How much do enhanced infrastructure metrics cost?

Visit the Compute Optimizer pricing page for details.

Q: What types of EC2 instance recommendations does AWS Compute Optimizer support?

AWS Compute Optimizer supports EC2 instance type and size recommendations for standalone EC2 instances of M, C, R, T, X, I, D, H, and z instance families. For the full list of supported EC2 instance types, see documentation.

Q: What data does AWS Compute Optimizer use for my EC2 instance recommendations?

AWS Compute Optimizer analyzes default CloudWatch metrics, such as CPU utilization, network packets per second, local storage throughput, and local storage IOPS when generating EC2 instance type recommendations.

Q: Does AWS Compute Optimizer analyze my EC2 instance memory metrics?

If you use CloudWatch agent to publish memory utilization, AWS Compute Optimizer automatically analyzes memory metrics published by the CloudWatch Agent in the “CWAgent” namespace.

Q: What happens if I don’t have memory metrics available for my EC2 instances?

If metrics for a hardware resource, such as memory, are not available, AWS Compute Optimizer will attempt to avoid making a recommendation that downsizes that dimension.

Q: How does AWS Compute Optimizer determine performance risk for recommended EC2 instance options?

Performance risk indicates the likelihood of the instance type not meeting the resource needs for your workload. Compute Optimizer calculates an individual performance risk score for each resource dimension of the recommended instance, including CPU, memory, EBS throughput, EBS IOPS, disk throughput, network throughput, and network PPS. For each resource dimension, the performance risk score is computed as the proportion of time over the historical lookback period where capacity may be constrained in the given resource dimension. The performance risk of the recommended instance is calculated as the maximum performance risk score across the analyzed resource specifications.

Q: How does AWS Compute Optimizer help me to understand recommended EC2 instance options?

AWS Compute Optimizer projects the would-be CPU and memory utilization of your EC2 instance had you used the recommended option, so that you can understand how your workload would have performed on the recommended options. AWS Compute Optimizer also lists the configuration differences between the current instance and the recommended instance type, so you can understand the updates you may need to apply to migrate your workloads from the current instance to the recommended instance type. 

Q: Does AWS Compute Optimizer consider EC2 instance pricing information when delivering recommendations?

After AWS Compute Optimizer identifies a list of optimal AWS resources for your workload, it incorporates a variety of pricing dimensions, such as on-demand pricing, along with expected performance risk to rank the recommendations. AWS Compute Optimizer does not consider transient pricing factors, such as spot pricing.

Q: What types of Auto Scaling group recommendations does AWS Compute Optimizer support?

AWS Compute Optimizer provides EC2 instance type and size recommendations for EC2 Auto Scaling groups with a fixed group size, meaning desired, minimum, and maximum are all set to the same value and have no scaling policy attached. Additionally, all Auto Scaling group member instances must be of type M, C, R, T, X, I, D, H, and z instance families. At this time Compute Optimizer does not support Auto Scaling groups configured with mixed instances policy. For the full list of supported EC2 instance types, see documentation.

Q: What data does AWS Compute Optimizer use for my Auto Scaling group recommendations?

AWS Compute Optimizer needs at least 30 hours of metrics before it makes recommendations for Auto Scaling groups. AWS Compute Optimizer analyzes default CloudWatch metrics of each member EC2 instances, such as CPU utilization and network I/O metrics, as well as Auto Scaling group configuration, such as scaling policy and associated launch template.

Q: What types of EBS volume recommendations does AWS Compute Optimizer support?

AWS Compute Optimizer supports IOPS and throughput recommendations for General Purpose (SSD) (gp3) volumes and IOPS recommendations for Provisioned IOPS (io1 and io2) volumes.

Q: What data does AWS Compute Optimizer use for my EBS volume recommendations?

AWS Compute Optimizer needs at least 30 consecutive hours of metrics before it makes recommendations for EBS volumes. AWS Compute Optimizer analyzes default CloudWatch metrics for EBS volumes, such as IOPS and throughput metrics.

Q: How does AWS Compute Optimizer determine performance risk for recommended EBS volume options?

Performance risk indicates the likelihood that the recommended option does not meet the performance requirements of your workload. The higher the performance risk, the more effort you may need to spend to validate whether the recommended EBS volume configuration meets the performance requirements of your workload.

Q: Does AWS Compute Optimizer consider EBS volume pricing information when delivering recommendations?

After AWS Compute Optimizer identifies a list of optimal EBS volume configurations for your workload, it incorporates public EBS pricing, along with expected performance risk, to rank the recommendations.

Q: What kind of Lambda functions does Compute Optimizer support?

Compute Optimizer helps you optimize two categories of Lambda functions. The first category includes Lambda functions that may be overprovisioned in memory sizes. You may consider downsizing the memory sizes of these functions to save costs. The second category includes compute-intensive Lambda functions that may benefit from additional CPU power. You may consider increasing their memory sizes to trigger an equivalent increase in CPU available to these functions and reduce runtime. For functions that do not fall under any of these categories, Compute Optimizer does not deliver recommendations for them.

Q: What data does Compute Optimizer use for my Lambda function recommendations?

AWS Compute Optimizer analyzes 14 days of Lambda function invocation history, including function runtime duration, CPU time used, and memory usage, to deliver recommendations.

Q: Does Compute Optimizer consider Lambda function pricing information when delivering recommendations?

Yes. After Compute Optimizer identifies optimal memory sizes for your Lambda functions, it incorporates public Lambda pricing, expected function runtime, and number of function invocations over the past 14 days to calculate a “would-be” cost number. You can use this number to understand what your Lambda cost would have been had you set the memory size of your Lambda function to the recommended option.

Q: What type of recommendations does ACO support for Amazon ECS on AWS Fargate?

AWS Compute Optimizer provides task-level CPU and memory size recommendations for Amazon ECS services running on AWS Fargate.

Q: What data does AWS Compute Optimizer use for my Amazon ECS services on AWS Fargate recommendations?

AWS Compute Optimizer needs at least 24 hours of metrics before it makes recommendations for your Amazon ECS services on AWS Fargate. AWS Compute Optimizer analyzes CPU and memory utilization data of Amazon ECS services on AWS Fargate.

Q: How does AWS Compute Optimizer help me understand recommendations for Amazon ECS services on AWS Fargate?

AWS Compute Optimizer projects the would-be CPU and memory utilization of your Amazon ECS services on AWS Fargate had you configure them as recommended, so that you can understand how your workload would have performed on the recommended configurations.

Q: Does AWS Compute Optimizer consider AWS Fargate pricing information when delivering recommendations?

Yes. After Compute Optimizer identifies optimal CPU and memory sizes for your Amazon ECS services on AWS Fargate, it incorporates public AWS Fargate pricing, new CPU and memory configurations, and runtime history over the past 14 days to calculate a “would-be” cost. You can use this information to understand what your Amazon ECS services on AWS Fargate cost would have been had you set the CPU and memory size to the recommended option.  

Q: Does AWS Compute Optimizer integrate with AWS Organizations?

Yes, AWS Compute Optimizer integrates with AWS Organizations to allow you to see all your recommendations within your organization. In order to use this feature, your organization must have “all features” enabled, and you must log in as the primary account of your organization.