mksnapshot and warm_up

[Johannes Rieken]

Hey, 

Can someone help me understand what the difference between a warm and cold snapshot is? I stumbled over `WarmUpSnapshotDataBlob` but I am not entirely sure how to make use of them via the mksnapshot-tools and what the sequence would be. Do I begin with a custom snapshot and then snapshot that snapshot again after its functions have been used?

Thanks, 

Joh

[Jakob Gruber]

On Thu, Mar 1, 2018 at 4:43 PM, Johannes Rieken <johanne...@gmail.com> wrote:

Hey, 

Can someone help me understand what the difference between a warm and cold snapshot is? I stumbled over `WarmUpSnapshotDataBlob` but I am not entirely sure how to make use of them via the mksnapshot-tools and what the sequence would be. Do I begin with a custom snapshot and then snapshot that snapshot again after its functions have been used?

Yes. See https://cs.chromium.org/chromium/src/v8/src/snapshot/mksnapshot.cc?l=177&rcl=fd158bc49d646d93a59cd07d07dfb9627bc94a30 for an example.

The steps are also nicely explained here:

https://cs.chromium.org/chromium/src/v8/src/api.cc?l=830&rcl=fd158bc49d646d93a59cd07d07dfb9627bc94a30 

[Johannes Rieken]

Great! Thanks for the speedy reply. Looking at https://cs.chromium.org/chromium/src/v8/test/cctest/test-serialize.cc?type=cs&q=CustomSnapshotDataBlobWithWarmup&l=1167 makes me think/hope  that functions are being compiled but state isn't changed (e.g. the assignment to `a` isn't persistent). Is that a correct assumption?

[ramon...@gmail.com]

Hello! I use a new email filtering service called BitBounce to better filter my spam. To deliver your email to my inbox, please click the link below and pay the small Credo fee. Thank you! You can sign up or get more info about BitBounce by clicking here. To deliver your email: We’ve never met. I’ll pay your fee. I know you. Add me to your whitelist. Email That Pays BitBounce is a product by: Turing Technology, Inc. BitBounce.com Redwood City, CA

[Jakob Gruber]

AFAIK that's correct. The polluted warmup context is thrown out, and a second clean context (with the now-compiled code) is serialized into the warmed up snapshot.

--

--
v8-users mailing list
v8-u...@googlegroups.com
http://groups.google.com/group/v8-users
---
You received this message because you are subscribed to the Google Groups "v8-users" group.
To unsubscribe from this group and stop receiving emails from it, send an email to v8-users+unsubscribe@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

Jakob Gruber

Software Engineer

jgr...@google.com

Google Germany GmbH

Erika-Mann-Straße 33

80636 München

Geschäftsführer: Paul Manicle, Halimah DeLaine Prado

Registergericht und -nummer: Hamburg, HRB 86891

Sitz der Gesellschaft: Hamburg

Diese E-Mail ist vertraulich. Falls sie diese fälschlicherweise erhalten haben sollten, leiten Sie diese bitte nicht an jemand anderes weiter, löschen Sie alle Kopien und Anhänge davon und lassen Sie mich bitte wissen, dass die E-Mail an die falsche Person gesendet wurde.

    

This e-mail is confidential. If you received this communication by mistake, please don't forward it to anyone else, please erase all copies and attachments, and please let me know that it has gone to the wrong person.

[ramon...@gmail.com]