Support .net 9 for lambda

[nrglv]

Describe the feature

• Please vote on this issue by adding a 👍 reaction to the original issue to help the community and maintainers prioritize this request
• Please do not leave "+1" or "me too" comments, they generate extra noise for issue followers and do not help prioritize the request

Use Case

1. Performance Optimizations
Over 1,000 changes aimed at improving performance and code generation quality.
Modernized garbage collector with a new dynamic adaptation mechanism, adjusting to application memory needs instead of available system resources. This improves efficiency on multi-core systems, especially for memory-constrained or dynamically changing workloads.
2.JIT Compiler Improvements
Profile-guided optimizations (PGO) for better loop handling, inline expansion, and bounds checking.
Enhanced vector instruction support, including Arm64 SVE and Intel AVX10.
Exception handling is 50% faster, while type casting operations (e.g., (IFoo)myFoo and myFoo is IFoo) are up to 70% faster.
LINQ and JSON Performance
LINQ methods like Take and DefaultIfEmpty are up to 10x faster with empty arrays or collections.
3. Significant improvements in System.Text.Json:
UTF-8 string writing eliminates unnecessary memory allocation.
Optimized resizing operations for JsonObject.
TechEmpower benchmarks show 15% better JSON processing performance and 93% memory usage reduction compared to .NET 8.
4. Runtime Enhancements
New attribute model introduced for feature activation and trimming in libraries.
These advancements make .NET 9 faster, more memory-efficient, and well-suited for modern high-performance applications.

https://github.com/dotnet/runtime/releases
https://devblogs.microsoft.com/dotnet/performance-improvements-in-net-9/

Proposed Solution

No response

Other Information

No response

Acknowledgements

• I may be able to implement this feature request
• This feature might incur a breaking change

AWS .NET SDK and/or Package version used

AWSSDK.Lambda 3.7.400.2

Targeted .NET Platform

.NET 9

Operating System and version

Mac, Linux

[slang25]

What is it you are asking for here? You can already run a .NET 9 Lambda using a provided runtime, the dotnet Lambda runtime will only support LTS releases.

The lambda core library doesn't need retargeting to support .NET 9 and get all the benefits you lost.

[ashishdhingra]

@nrglv Good morning. AWS provided Lambda runtimes support .NET LTS releases only. Lambda .NET 9 container images might take a while to be available in ECR repo. CC @normj @philasmar for any inputs.

[petro2050]

What is it you are asking for here? You can already run a .NET 9 Lambda using a provided runtime, the dotnet Lambda runtime will only support LTS releases.

The lambda core library doesn't need retargeting to support .NET 9 and get all the benefits you lost.

I think we need instructions here if it's possible to do this.

• provided.al2023
• .NET 9
• zip deployment

Do we need to publish the app as self-contained? If so, what does this mean for cold-start times due to a bigger binary size?

[ashishdhingra]

@nrglv Good morning. AWS provided Lambda runtimes support .NET LTS releases only. Lambda .NET 9 container images might take a while to be available in ECR repo. CC @normj @philasmar for any inputs.

@nrglv In the meanwhile, you could go with self-contained deployments until container images are available in ECR repo.

[github-actions]

This issue has not received a response in 5 days. If you want to keep this issue open, please just leave a comment below and auto-close will be canceled.