21–30 of 520 posts
Is there a technical reason for the web limit to be 16 GB specifically? Or is it just a round number picked so that the limit could be standardized? Also, has the limit on JS heap size (and ArrayBuffer size) also been relaxed to 16 GB or is it still lower?
> Wasm GC is low-level as well: a compiler targeting Wasm can declare the memory layout of its runtime data structures in terms of struct and array types, plus unboxed tagged integers, whose allocation and lifetime is then handled by Wasm.
There's already a lot misunderstandings about wasm, and I fear that people will just go "It supports GC, so we can just export python/java/c#/go etc."
This is not a silver bullet. Cpp, or rust are probably still going to be the way to go.
Relying on the GC features of WASM will require writing code centered around the abstractions for the compiler that generates WASM.
Earlier quoted context omitted.
Not including GC would have been a mistake. Having to carry a complete garbage collector with every program, especially on platforms like browsers were excellent ones already exist, would have been a waste.
how is that different from compiling against a traditional CPU which also doesn't have a built in GC? i mean those programs that need a GC already have one. so what is the benefit of including one on the "CPU"?
Garbage collection is a small part of the go run time, but it's not insignificant.
The one in particular I have in mind would be to put WASM on graphical calculators, in order to have a more secure alternative to the ASM programs (it's possible nowadays to write in higher-level languages, but the term stuck) that could work across manufacturers. Mid-range has RAM on the order of 256 KiB, but a 32-bit core clocked at more than 200 MHz, so there's plenty of CPU throughput but not a lot of memory to work with.
Sadly, the closest thing there is for that is MicroPython. It's good for what it does, but its performance and capabilities are nowhere near native.
Earlier quoted context omitted.
how is that different from compiling against a traditional CPU which also doesn't have a built in GC? i mean those programs that need a GC already have one. so what is the benefit of including one on the "CPU"?
The "CPU" in every browser already has one. This lets garbage-collected languages use that one. That's an enormous savings in code size and development effort.
so most GC-languages being ported to webassembly already have a GC, so what is the benefit of using a provided GC then?
on the other hand i see GC as a feature that could become part of any modern CPU. then the benefit would be large, as any language could use it and wouldn't have to implement their own at all anymore.
Does WASM still have 64 KiB pages? I get why for desktops, but there are use-cases for running WASM on microcontrollers where that's either inconvenient or outright impossible. The one in particular I have in mind would be to put WASM on graphical calculators, in order to have a more secure alternative to the ASM programs (it's possible nowadays to write in higher-level languages, but the term stuck) that could work…
> GC and Exception handling This was not necessary.. what a mistake, specially EH..
Does WASM still have 64 KiB pages? I get why for desktops, but there are use-cases for running WASM on microcontrollers where that's either inconvenient or outright impossible. The one in particular I have in mind would be to put WASM on graphical calculators, in order to have a more secure alternative to the ASM programs (it's possible nowadays to write in higher-level languages, but the term stuck) that could work…
On gc: > Wasm GC is low-level as well: a compiler targeting Wasm can declare the memory layout of its runtime data structures in terms of struct and array types, plus unboxed tagged integers, whose allocation and lifetime is then handled by Wasm. There's already a lot misunderstandings about wasm, and I fear that people will just go "It supports GC, so we can just export python/java/c#/go etc." This is not a silver b…
What's the value proposition of WASM GC if not this?
Has anyone benchmarked 64bit memory on the current implementations? There's the potential for performance regressions there because they could exploit the larger address space of 64bit hosts to completely elide bounds checks when running 32bit WASM code, but that doesn't work if the WASM address space is also 64bit.
> WebAssembly apps tend to run slower in 64-bit mode than they do in 32-bit mode. This performance penalty depends on the workload, but it can range from just 10% to over 100%—a 2x slowdown just from changing your pointer size. > This is not simply due to a lack of optimization. Instead, the performance of Memory64 is restricted by hardware, operating systems, and the design of WebAssembly itself. https://spidermonke…