v8 context snapshots... essential for startup?

[Jean-François Dagenais]

Hi all!

Currently integrating libcef/cefsimple with my target, and faced with a white rectangle. I have tried --disable-gpu and my traces show chromium using swiftshader libEGL and libGLESv2.

This is my basic run setup, as root:

cefsimple --no-sandbox --url=about://gpu --disable-gpu

I have not yet been able to generate context snapshots, and when I start on the target, I get 2 of these with a stack trace:

# Fatal error in , line 0

# Failed to deserialize the V8 snapshot blob. This can mean that the snapshot blob file is corrupted or missing.

Just so I don't waste time and am able to prioritize, can this cause the white rectangle?

Thanks for any pointers guys!

[Yang Guo]

It means that no JS gets executed. That might result in things that rely on JS execution to not render.

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[Jean-François Dagenais]

Thanks Yang,

So, just loading a png or "about://gpu" should not really be affected by this ?

[Jean-François Dagenais]

For what it's worth... it seems the build generates a snapshot_blob.bin even if use_v8_context_snapshot = false

The absence of this file on the target causes v8 engine init fatal error and prevents cefsimple (or libcef?) to initialize properly.

[Jakob Gruber]

V8 requires snapshot_blob.bin as you found out. To avoid confusion, `use_v8_context_snapshot` refers to a custom snapshot for chromium, which is slightly different from the default snapshot (it contains a few addtl things). 

So in your case, I'd suggest using `use_v8_context_snapshot = false`, while still properly installing snapshot_blob.bin.

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[Jean-François Dagenais]

Thanks Jakob!