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.

On Thu, Mar 1, 2018 at 5:31 PM, Johannes Rieken <johannes.rie...@gmail.com>
wrote:

> 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?
>
> On Thursday, March 1, 2018 at 5:16:37 PM UTC+1, Jakob Gruber wrote:
>>
>> 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/mks
>> napshot.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
>>
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