Viewing profile — herobird

My view on specifications is that their long-term success depends on the value they provide relative to their complexity. Complexity inevitably grows over time, so spending that co…

> There is a lot of desire for advancement, but standardization means decisions are hard to reverse. For many, things are moving too quickly and in the wrong direction. Most Wasm p…

It's kinda frustrating that Mozilla's CEO thinks that axing ad-blockers would be financially beneficial for them. Quite the opposite is true (I believe) since a ton of users would …

Article author here! Feel free to ask me anything. :)

Yes, Wasmi's fuel metering is deterministic.

Awww, makes me very happy to hear! :) Thank you!

Wasmtime, being an optimizing JIT, usually is ~10 times faster than Wasmi during execution. However, execution is just one metric that might be of importance. For example, Wasmi's …

Yes, rational is to provide a pragmatic and efficient solution to infinite loops. There is a variety of ways to implement fuel metering with varying trade-offs, e.g. performance, d…

I am really sorry I have waited so long to extend Wasmi's resumable calls with this very useful feature. :S Feel free to message me if you ever plan to adjust your design to make u…

I don't know how fuel metering in Wasmtime works and what its overhead is but keep in mind that Wasmi is an interpreter based Wasm runtime whereas Wasmtime generates machine code (…

Great question! Wasmi's fuel metering can be thought of as is there was an adjustable counter and for each instruction that Wasmi executes this counter is decreased by some amount.…

> Every iteration of the loop polls the network and input drivers, draws the desktop interface, runs one step of each active WASM application, and flushes the GPU framebuffer. This…

Wasmi author here. Glad to see Wasmi being used in embedded contexts were it really shines. :) I just watched the demo video of Munal OS and am still in awe of all of its features.…

Have you had experience implementing SSA via sea-of-nodes representation? Could it be that in this case dominance frontier is no longer important and one could use the simpler SSA …

Yes this iterative process is indeed very visible. Wasmi started out as a mostly safe Rust interpreter and over time went more and more into a performance oriented direction. Thoug…

No I do not but it is a very interesting question and probably not even answerable in practice because not every instruction takes the same amount of time to execute to completion.…

Also great job on Wizard btw! Your article about Wizard was a really interesting read to me. The abundance of Wasm runtimes is a testimony of how great the WebAssembly standard rea…

Oh this is very interesting! I wish I knew about this before I wrote my own benchmarking suite. :D

Thank you! :) when using lazy-unchecked translation with relatively small programs, setting up the Linker sometimes can take up the majority of the overall execution with ~50 host …

I am aware of Wizard and I think it is a pretty interesting Wasm runtime. It would be really cool if it was part of Wasmi's benchmark testsuite ( https://github.com/wasmi-labs/wasm…

Wasmi is an independent project nowadays. And you are right that it was originally designed for efficient smart contract execution but with a scope for more general use.

Thank you, that's a good summary of the article! Even faster startup times can be achieved by so-called in-place interpreters that do not even translate the Wasm binary at all and …

I was just told that I should state here that I am the author of the article, please ask me anything. :)

For startup performance Wasmi and Wasm3 are both the fastest engines according to the benchmarks. For execution performance you are right that generally JIT engines are expected to…