Hi, > Specifically, I'd like to measure only the memory allocated due to WasmGC (excluding everything JS related).
If you take a heap snapshot, these snapshots include wasm-gc objects. At least in DevTools wasm types look like "$type5316 (wasm)". (If you don't have source maps, otherwise the name should be nicer.) So you should be able to take a heap snapshot and then process it to filter it to the types that include "(wasm)" to get the wasm-gc heap usage. > Is it possible to measure the heap usage due to WasmGC separately? No, you'll need to extract that information unfortunately (or see --trace-gc-object-stats below). > (I only use WasmGC's structs (and i31s, but they are not stored on the heap I guess)) Exactly, i31refs do not take extra heap usage (other than the memory for the reference itself, e.g. when stored in a struct / array. Getting the maximum memory would be more difficult. You can get aggregated data with the command line flag --trace-gc-object-stats. There you'd need to mainly check for WASM_ARRAY_TYPE and WASM_STRUCT_TYPE. This might be even easier than filtering the heap snapshots and as it logs these stats on every mark compact of the GC it should give you a good indication of what the maximum heap usage for wasm is, assuming there aren't that many large JS allocations happening in between. (You might want to make sure to trigger a manual GC at the end of the script, not sure if things like --expose-gc work in node.js to do that.) Best regards, Matthias On Sat, Jun 8, 2024 at 11:14 PM Wolfgang <w22639...@gmail.com> wrote: > Hello, > I'm running some numbers for my masters thesis. > > I'd like to measure the heap usage of Node.js when running a WasmGC module. > > Specifically, I'd like to measure only the memory allocated due to WasmGC > (excluding everything JS related). > E.g. the total memory allocated and the maximum observed throughout > execution would be interesting for me. > > Is it possible to measure the heap usage due to WasmGC separately? > (I only use WasmGC's structs (and i31s, but they are not stored on the > heap I guess)) > > Thanks in advance. > Best, > Wolfgang > > -- > -- > v8-dev mailing list > v8-dev@googlegroups.com > http://groups.google.com/group/v8-dev > --- > You received this message because you are subscribed to the Google Groups > "v8-dev" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to v8-dev+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/v8-dev/a48c3ded-c738-4f79-a0fa-8d838d629570n%40googlegroups.com > <https://groups.google.com/d/msgid/v8-dev/a48c3ded-c738-4f79-a0fa-8d838d629570n%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- -- v8-dev mailing list v8-dev@googlegroups.com http://groups.google.com/group/v8-dev --- You received this message because you are subscribed to the Google Groups "v8-dev" group. To unsubscribe from this group and stop receiving emails from it, send an email to v8-dev+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/v8-dev/CACx9iANrDzoeNYLStvDPJLQERK%2Bj2Ui_bGTDw1zWZ93bf8oPUA%40mail.gmail.com.
