Wasmtime at Scale: Isolation, Cold-Start and Tail-Latency Trade-offs of WebAssembly Microservices in Production

This paper will cover the implementation of Wasmtime to support WebAssembly microservices on a large scale particularly focusing on the performance trade-offs associated with isolation, cold-start latency, and tail-latency under production. WebAssembly is an attractive option in the context of new cloud-native applications because of its ability to provide secure, portable and efficient microservice, however, there are unique challenges associated with its integration scale. This study assesses the possibilities of Wasmtime in solving these issues by examining its behavior in the real-world production environment. We measure the capability of the runtime at meeting the most important trade-offs: isolation guarantees securities, cold-start latencies guarantee responsiveness and tail-latency minimization in the name of provide users with a consistent experience. The researchers conclude that Wasmtime is much better in terms of scalability and performance, however, with some limitations in extreme conditions. The results are informative to developers who are interested in optimizing WebAssembly-based microservices and can be used to guide future developments in WebAssembly runtimes to address large-scale high-performance applications.