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By default, Node.js enables trap-handler-based WebAssembly bound
checks. As a result, V8 does not need to insert inline bound checks
int the code compiled from WebAssembly which may speedup WebAssembly
execution significantly, but this optimization requires allocating
a big virtual memory cage (currently 10GB). If the Node.js process
does not have access to a large enough virtual memory address space
due to system configurations or hardware limitations, users won't
be able to run any WebAssembly that involves allocation in this
virtual memory cage and will see an out-of-memory error.
```console
$ ulimit -v 5000000
$ node -p "new WebAssembly.Memory({ initial: 10, maximum: 100 });"
[eval]:1
new WebAssembly.Memory({ initial: 10, maximum: 100 });
^
RangeError: WebAssembly.Memory(): could not allocate memory
at [eval]:1:1
at runScriptInThisContext (node:internal/vm:209:10)
at node:internal/process/execution:118:14
at [eval]-wrapper:6:24
at runScript (node:internal/process/execution:101:62)
at evalScript (node:internal/process/execution:136:3)
at node:internal/main/eval_string:49:3
```
`--disable-wasm-trap-handler` disables this optimization so that
users can at least run WebAssembly (with a less optimial performance)
when the virtual memory address space available to their Node.js
process is lower than what the V8 WebAssembly memory cage needs.
PR-URL: https://github.com/nodejs/node/pull/52766
Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com>
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| .. | ||
| test-wasm-allocation.js | ||
| testcfg.py | ||
| wasm-allocation.status | ||