On Tue, Jun 3, 2025 at 12:35 PM Subash <subash2826...@gmail.com> wrote:
> ok Jakob, thanks for clarification. if we --no-extensible_ro_snapshot do
> this, will it have a any performance impact.
>
I wouldn't expect a major impact, but it's impossible to say for sure
without measuring your specific case.
>
> On Tue, Jun 3, 2025 at 4:01 PM Jakob Gruber <jgru...@chromium.org> wrote:
>
>>
>>
>> On Tue, Jun 3, 2025 at 12:17 PM Subash <subash2826...@gmail.com> wrote:
>>
>>> Hi Jakob Grube,
>>>
>>> I am not reusing isolate. Each js execution happens in its own
>>> isolate. But I have a threadpool that will reuse the thread. Means the same
>>> thread may create another isolate after it gets a chance again.
>>> I load the snapshot bytes into char* array. Each create the isolate i
>>> will copy the bytes and feed to startup data in CreateParams.
>>>
>>
>> With default settings, all Isolates within the same process will reuse
>> certain resources. Perhaps most importantly, ReadOnlySpace is reused. This
>> is why all snapshots used within the same process must have compatible RO
>> space layout.
>>
>>
>>>
>>> I am creating a snapshot using
>>> SnapshotCreator::CreateBlob(FunctionCodeHandling::kKeep).
>>>
>>> I will check with --no-extensible_ro_snapshot
>>>
>>> flags.append(" --no-extensible_ro_snapshot");
>>> v8::V8::SetFlagsFromString(flags.c_str());
>>>
>>> I am disabled like this.
>>>
>>>
>>>
>>>
>>> On Tue, Jun 3, 2025 at 1:01 PM Jakob Gruber <jgru...@chromium.org>
>>> wrote:
>>>
>>>>
>>>>
>>>> On Tue, Jun 3, 2025 at 8:29 AM Subash Durairaj <subash2826...@gmail.com>
>>>> wrote:
>>>>
>>>>>
>>>>> /lib/x86_64-linux-gnu/libc.so.6(+0x3bd60)[0x7fe7781b6d60]
>>>>>
>>>>> v8::internal::StringTableInsertionKeyC2EPNS0_7IsolateENS0_6HandleINS0_6StringEEENS0_27DeserializingUserCodeOptionE+0x1c)[0x55b7ef4e844c]
>>>>>
>>>>> v8::internal::StringTable::InsertForIsolateDeserializationIsolateERKSt6vectorINS0_6HandleINS0_6StringEEESaIS7_EE+0x74)[0x55b7ef416e14]
>>>>>
>>>>> v8::internal::SharedHeapDeserializer::DeserializeStringTableEv+0x93)[0x55b7ef4f80f3]
>>>>>
>>>>> v8::internal::SharedHeapDeserializer::DeserializeIntoIsolateEv+0x68)[0x55b7ef4f8448]
>>>>>
>>>>> v8::internal::Isolate::Init::SnapshotDataES3_S3_b+0xd0d)[0x55b7ef12e00d]
>>>>>
>>>>> v8::internal::Snapshot::InitializeEPNS0_7IsolateE+0x189)[0x55b7ef4f94b9]
>>>>> v8::Isolate::Initialize::CreateParamsE+0x193)[0x55b7ef08d243]
>>>>> v8::Isolate::New::CreateParamsE+0x22)[0x55b7ef08d532]
>>>>>
>>>>>
>>>>> Hi Team, i am getting this crash when creating a new isolate.
>>>>>
>>>>> i am embedded v8 and running as a server to provide js execution.
>>>>> i ran maximum of 100 isolates in parallel with two different
>>>>> snapshot.
>>>>> each execution choose any one of snapshot
>>>>>
>>>>
>>>> We've seen problems related to using different snapshots within the
>>>> same Isolate before. To rule this out, please try disabling the
>>>> `extensible_ro_snapshot` when building the snapshot, either by using the gn
>>>> flag:
>>>>
>>>> v8_enable_extensible_ro_snapshot=false
>>>>
>>>> or the runtime flag:
>>>>
>>>> --no-extensible_ro_snapshot
>>>>
>>>> Otherwise, we'll need more information about the crash.
>>>>
>>>>
>>>>>
>>>>> i am getting this crash randomly. wondering how to fix this
>>>>>
>>>>> Please give me the direction to fix this.
>>>>>
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