I did some more experiments and it turns out that freezing all globals
breaks quite a bit of code since the semantics for property assignment
change. For example, the following pattern wouldn't work anymore if
Error.prototype is frozen:
function MyError(e) {}
MyError.prototype = new Error
MyError.prototype.name = "MyError"; // ignored or TypeError if strict mode
or more simply:
var e = new Error;
e.name = "MyError"; // ignored or TypeError if strict mode
I guess object freezing can't be an after-thought and has to be part of the
contract of an API, in this case the built-in API.
Maik Riechert schrieb am Mittwoch, 8. Dezember 2021 um 12:17:50 UTC:
> I had another thought about re-using contexts. If there was a way to
> freeze the global object (make it and all its child objects read-only),
> would that be enough to guarantee a predictable state per request? I
> realize that this probably would break some libraries, but I'd like to
> explore it nevertheless. This would preclude caching any v8::Module objects
> (since they have state as well), but that would be fine.
>
> Maik Riechert schrieb am Montag, 6. Dezember 2021 um 14:29:24 UTC:
>
>> Sorry for the late response, for some reason this ended up in spam...
>> On 29.11.2021 23:50, Jakob Kummerow wrote:
>>
>> You can turn off snapshot compression to see if that makes a difference.
>> Add v8_enable_snapshot_compression = false to your GN args.
>>
>> Disabling snapshot compression helped a bit. As a test, I also disabled
>> string rehashing. Now most of the overhead is deserialization. I attached a
>> flamegraph, maybe that gives some insight.
>>
>
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