Hi, Mads，
Yeah, I see. Thanks for your answer. Another question :-), if we enable multi-thread by v8::V8::Locker, will other threads dead too if one thread encounter OOM? Sincerely~ Xiang On Wed, Nov 25, 2009 at 3:54 PM, Mads Sig Ager <[email protected]> wrote: > > Nothing like that exists. We do not know in advance that we are going > to run out of memory. > > -- Mads > > On Wed, Nov 25, 2009 at 8:52 AM, Xiang Zhong <[email protected]> wrote: > > > > Hi, Mads, > > > > Is there a way that the caller can get notified before an OOM situation > > happen? > > If that is possible, the caller can call v8::V8::TerminateExecution() > > beforehand, and dispose the global object in time to free memory. > > That will save v8 from being dead or crashing. > > > > We can hook a callback through SetGlobalGCEpilogueCallback() after GC > > happen, if we can get a flag some like " GC_FAIL_GOING_TO_OUT_OF_MEMORY", > > then it is possible to check the flag and terminate in time. > > Does there exist something like that? > > > > Wishes~ > > Xiang > > > > On Wed, Nov 25, 2009 at 3:35 PM, Mads Sig Ager <[email protected]> > wrote: > >> > >> An out of memory situation can leave the VM in an inconsistent state, > >> so it is not possible to continue. It is therefore the expected > >> behavior that we cannot continue here. > >> > >> Cheers, -- Mads > >> > >> On Wed, Nov 25, 2009 at 3:45 AM, Xiang <[email protected]> wrote: > >> > > >> > Hi, All, > >> > > >> > I have declared v8::V8::IgnoreOutOfMemoryException(), and the out of > >> > memory exception is caught by trycatch as expected. > >> > > >> > However, after disposing the current context, we can't create a new > >> > context. > >> > > >> > The handle is empty. > >> > > >> > Please check the following UＴ case: > >> > > >> > Reproduction steps > >> > --------------------------------------------------------- > >> > Please add the following case to test-api.cc, > >> > > >> > When creating a new context, > >> > v8::Persistent<v8::Context> context = v8::Context::New(0, > >> > v8::Handle<v8::ObjectTemplate>(), v8::Handle<v8::Value>()); > >> > It will fail > >> > > >> > TEST(CreateNewContextAfterOutOfMemory) { > >> > // It's not possible to read a snapshot into a heap with > >> > different > >> > dimensions. > >> > if (v8::internal::Snapshot::IsEnabled()) return; > >> > // Set heap limits. > >> > static const int K = 1024; > >> > v8::ResourceConstraints constraints; > >> > constraints.set_max_young_space_size(256 * K); > >> > constraints.set_max_old_space_size(4 * K * K); > >> > v8::SetResourceConstraints(&constraints); > >> > > >> > // Execute a script that causes out of memory. > >> > v8::HandleScope scope; > >> > { > >> > LocalContext context; > >> > v8::V8::IgnoreOutOfMemoryException(); > >> > Local<Script> script = > >> > Script::Compile(String::New(js_code_causing_out_of_memory)); > >> > Local<Value> result = script->Run(); > >> > > >> > // Check for out of memory state. > >> > CHECK(result.IsEmpty()); > >> > CHECK(context->HasOutOfMemoryException()); > >> > } > >> > > >> > { > >> > v8::Persistent<v8::Context> context = v8::Context::New(0, > >> > v8::Handle<v8::ObjectTemplate>(), v8::Handle<v8::Value>()); > >> > > >> > > >> > //Check here! > >> > > >> > //I think we should be allowed to create a new context > >> > //And the Handle should not be empty > >> > CHECK(!context.IsEmpty()); > >> > context.Dispose(); > >> > context.Clear(); > >> > } > >> > } > >> > > > >> > > > > > > > > > > > > > > > > --~--~---------~--~----~------------~-------~--~----~ v8-dev mailing list [email protected] http://groups.google.com/group/v8-dev -~----------~----~----~----~------~----~------~--~---
