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 -~----------~----~----~----~------~----~------~--~---
