v8Flags.setMaxHeapSize() is this shared for all engines?

[RakeshRaparthi]

v8Flags.setMaxHeapSize(4gb)

• when we set 4Gb. is 4gb shared for all engines?
• or for each engine have 4gb heap?

[caoccao]

Every V8 runtime has its own heap with that max heap size. Once it's set, there's no way of adjusting it and all V8 runtimes share the same max heap size. That's by design.

[RakeshRaparthi]

If I initialize 20 engines with setMaxHeapSize(4GB), each engine can use up to 4GB.. is it right? YES/NO. please confirm.

[caoccao]

Yes. The worst case is 20 x 4GB, but that's very rare.