[Webkit-unassigned] [Bug 186729] New: StructureCache wastes 240KB of HashTable capacity on cnn.com

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=186729

            Bug ID: 186729
           Summary: StructureCache wastes 240KB of HashTable capacity on
                    cnn.com
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: simon.fraser at apple.com

Using tooling from bug 186698, loading can and running "notifyutil -p com.apple.WebKit.dumpHashTableCapacity" shows:

Wasted capacity: 244368 bytes (used 148848 of 393216 bytes, utilization: 37.85%) - 1 allocations
1   0x1166cc265 WTF::HashTable<JSC::PrototypeKey, WTF::KeyValuePair<JSC::PrototypeKey, JSC::Weak<JSC::Structure> >, WTF::KeyValuePairKeyExtractor<WTF::KeyValuePair<JSC::PrototypeKey, JSC::Weak<JSC::Structure> > >, JSC::PrototypeKeyHash, WTF::HashMap<JSC::PrototypeKey, JSC::Weak<JSC::Structure>, JSC::PrototypeKeyHash, WTF::HashTraits<JSC::PrototypeKey>, WTF::HashTraits<JSC::Weak<JSC::Structure> > >::KeyValuePairTraits, WTF::HashTraits<JSC::PrototypeKey> >::HashTable()
2   0x1166cc245 WTF::HashMap<JSC::PrototypeKey, JSC::Weak<JSC::Structure>, JSC::PrototypeKeyHash, WTF::HashTraits<JSC::PrototypeKey>, WTF::HashTraits<JSC::Weak<JSC::Structure> > >::HashMap()
3   0x1166cc1a5 WTF::HashMap<JSC::PrototypeKey, JSC::Weak<JSC::Structure>, JSC::PrototypeKeyHash, WTF::HashTraits<JSC::PrototypeKey>, WTF::HashTraits<JSC::Weak<JSC::Structure> > >::HashMap()
4   0x1166cc15b JSC::WeakGCMap<JSC::PrototypeKey, JSC::Structure, JSC::PrototypeKeyHash, WTF::HashTraits<JSC::PrototypeKey> >::WeakGCMap(JSC::VM&)
5   0x1166cc10d JSC::WeakGCMap<JSC::PrototypeKey, JSC::Structure, JSC::PrototypeKeyHash, WTF::HashTraits<JSC::PrototypeKey> >::WeakGCMap(JSC::VM&)
6   0x1166cc0dd JSC::StructureCache::StructureCache(JSC::VM&)
7   0x1166bffed JSC::StructureCache::StructureCache(JSC::VM&)
8   0x1166bc42f JSC::VM::VM(JSC::VM::VMType, JSC::HeapType)

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