Help needed. WebAssembly page memory usage is very large

[曹俊跃]

Hi memory dev team,

I have a web page using WebAssembly for video playing and the memory consumption is very high. Besides, the memory keeps growing when I play the video.

I followed https://chromium.googlesource.com/chromium/src/+/HEAD/docs/memory/debugging_memory_issues.md instruction to find out the problem and I found the difference is mainly in private footprint.

1. The attached trace_with_heap_dump-before.json.gz is dumped before loading the wasm part. The private footprint is 374MB

2. The attached trace_with_heap_dump-after.json.gz is dumped after loading the wasm part. The private footprint is 2093MB

I also attached two smaps from /proc/<proc_id>/smaps.

Reproduce(SharedArrayBuffer needs to be run with https, See readme in the zip):

Reproduce demo page:https://drive.google.com/file/d/1hY5xol9FP1YRmY7itSWzPmhxM_FcyQx3/view?usp=sharing

I hope you can help me to find out why the memory usage is so large. Thank you very much.