I just verified a customer reported bug - a slowdown in the new bookmark manager when deleting folders containing many (~2,500) bookmarks. Deleting them takes over a minute. Profiling with ETW (Event Tracing for Windows -- this is on a Windows machine) shows that 98.6% of the CPU time (it is CPU bound) is inside chrome_child.dll!v8::internal::Isolate::get_stack_trace_line_fun.
With the old bookmark manager the deletion is virtually instantaneous. I have also seen get_stack_trace_line_fun consuming a huge portion of CPU time on slashdot.org. This feels like it might be a serious regression in JS performance in multiple scenarios. I've filed a bug for this: https://code.google.com/p/chromium/issues/detail?id=474276 My bookmarks tests are on 32-bit canary. The slashdot tests were on stable (41.0.2272.101). Here is a partial call stack. After get_stack_trace_line_fun it goes into unresolved addresses (generated code presumably) before popping out in chrome_child.dll!v8::internal::Runtime_KeyedGetProperty. | | | chrome_child.dll!blink::Node::dispatchMouseEvent | | | chrome_child.dll!blink::EventDispatcher::dispatchEvent | | | chrome_child.dll!blink::MouseEventDispatchMediator::dispatchEvent | | | chrome_child.dll!blink::EventDispatcher::dispatchEventAtTarget | | | chrome_child.dll!blink::NodeEventContext::handleLocalEvents | | | chrome_child.dll!blink::Node::handleLocalEvents | | | chrome_child.dll!blink::EventTarget::fireEventListeners | | | chrome_child.dll!blink::EventTarget::fireEventListeners | | | chrome_child.dll!blink::V8AbstractEventListener::handleEvent | | | chrome_child.dll!blink::V8AbstractEventListener::handleEvent | | | chrome_child.dll!blink::V8AbstractEventListener::invokeEventHandler | | | chrome_child.dll!blink::V8EventListener::callListenerFunction | | | chrome_child.dll!blink::ScriptController::callFunction | | | chrome_child.dll!blink::ScriptController::callFunction | | | chrome_child.dll!blink::V8ScriptRunner::callFunction | | | chrome_child.dll!v8::Function::Call | | | chrome_child.dll!v8::Function::Call | | | chrome_child.dll!v8::internal::Execution::Call | | | chrome_child.dll!v8::internal::Isolate::get_stack_trace_line_fun -- -- v8-dev mailing list [email protected] http://groups.google.com/group/v8-dev --- You received this message because you are subscribed to the Google Groups "v8-dev" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
