Snapshot limitations

[Roey Berman]

Hi,

I'm trying to create a persistent v8 runtime where I can at any point take a snapshot of a running isolate.

I'm wondering what the limitations of SnapshotCreator are.

I have only seen it being used for creating startup snapshots.

Is it possible to call SnapshotCreator.CreateBlob() multiple times on the same instance?

I got a segfault when I tried that but I couldn't see anything the implies that it shouldn't be safe in the docs.

Also, is it possible to load modules during snapshot creation?

Thanks,

- Roey

[Jakob Gruber]

I think crbug.com/v8/10500 will answer some of your questions. Short version: no, currently you can't snapshot a running isolate with arbitrary state. Also take a look at the d8 --stress-snapshot flag, which takes a snapshot after executing arbitrary JS but without guaranteeing that the resulting deserialized heap state is still executable (in many cases it won't be). Re. modules support, see crbug.com/v8/10855.

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[Roey Berman]

Thanks for the quick response.

I'll go over everything and see if there's a way to work around these limitations.

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