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<https://twitter.com/bashorov/status/1674042199305011202>

Special thanks to <@UAG4QQZB6>

`Unhandled JavaScript exception: wasm validation error: at offset 123: bad type`

Didn't work for me on Firefox Android either

Try it on Chrome. <@U0BMF6PDJ> I'm assuming <http://play.kotlinlang.org|play.kotlinlang.org> is enrolled in the WasmGC origin trial?

If not, then <chrome://flags/#enable-webassembly-garbage-collection>

So, totally unscientific crappy benchmark, BUT interesting as a starting point:

JVM: 173.841535 ms
JS: 98.2 ms
JS IR: 63.7 ms
WASM: 27.7 ms

Why is JVM so slow? Something to do with the way play runs this code on the JVM?

I guess JS, JS IR, and WASM are running on my local beefy box, JVM is running on some resource-constrained VM on the play server.

I assume JVM hotspot doesn't have enough time to kick in

Yeah, but even putting the computeAck in a loop it gets a bit faster at 155 ms but doesn't improve beyond that. But like I said, crappy benchmark.

Would be interesting to see a comparison on the same hardware

Maybe even applying some "serverless" optimisations to jvm too

Yeah, with kotlinx-benchmark to set up a more reasonable microbenchmark environment

<@UFT11FKSP> Same issue here with Firefox on Linux, despite enabling `wasm_function_references` and `wasm_gc`.

The compose demo doesn't work as well (<https://zal.im/wasm/creative/>)

I'm almost sure it did work in the past ...

I note the Kotlin docs reference `javascript.options.wasm_function_references` and `javascript.options.wasm_gc`, but those aren't available options (any more?) in about:config. They can be added manually but don't exist by default.

Ran kotlinx-benchmark on that ack fun. Here are the results (for comparison only)
• wasm: 62.658358974358976ms
• linuxX64: 243.702351ms
• js: 199.5830523333333ms
• jvm: 124.03912462037037ms

&gt; Try it on Chrome. <@U0BMF6PDJ> I’m assuming <http://play.kotlinlang.org|play.kotlinlang.org> is enrolled in the WasmGC origin trial?
<@U0NT624JZ> Sure :slightly_smiling_face:

&gt; Didn’t work for me on Firefox Android either
<@UL1A5BA2X> Try Firefox Nightly, but still you need to turn on flags at about:config, more here <http://kotl.in/wasm_help|kotl.in/wasm_help>

<@UFT11FKSP> for Firefox GC proposals is available only in Nightly versions now, and not Origin Trials :disappointed: so you need to turn on features manually at about:config, more here <http://kotl.in/wasm_help|kotl.in/wasm_help>

<https://kotlinlang.slack.com/archives/CDFP59223/p1687967537288999?thread_ts=1687957776.202199&amp;cid=CDFP59223>
These are available on FF nightly, and it does work with these enabled. Shame the stable version doesn't even have these flags, even if disabled by default.

Don’t hesitate to vote <https://bugzilla.mozilla.org/show_bug.cgi?id=1825077>