[Webkit-unassigned] [Bug 186726] New: SymbolTable wastes 1.5MB of HashTable capacity on cnn.com

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=186726

            Bug ID: 186726
           Summary: SymbolTable wastes 1.5MB 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: 1570032 bytes (used 640016 of 2210048 bytes, utilization: 28.96%) - 6908 allocations
1   0x116698ef5 WTF::HashTable<WTF::RefPtr<WTF::UniquedStringImpl, WTF::DumbPtrTraits<WTF::UniquedStringImpl> >, WTF::KeyValuePair<WTF::RefPtr<WTF::UniquedStringImpl, WTF::DumbPtrTraits<WTF::UniquedStringImpl> >, JSC::SymbolTableEntry>, WTF::KeyValuePairKeyExtractor<WTF::KeyValuePair<WTF::RefPtr<WTF::UniquedStringImpl, WTF::DumbPtrTraits<WTF::UniquedStringImpl> >, JSC::SymbolTableEntry> >, JSC::IdentifierRepHash, WTF::HashMap<WTF::RefPtr<WTF::UniquedStringImpl, WTF::DumbPtrTraits<WTF::UniquedStringImpl> >, JSC::SymbolTableEntry, JSC::IdentifierRepHash, WTF::HashTraits<WTF::RefPtr<WTF::UniquedStringImpl, WTF::DumbPtrTraits<WTF::UniquedStringImpl> > >, JSC::SymbolTableIndexHashTraits>::KeyValuePairTraits, WTF::HashTraits<WTF::RefPtr<WTF::UniquedStringImpl, WTF::DumbPtrTraits<WTF::UniquedStringImpl> > > >::HashTable()
2   0x116698ed5 WTF::HashMap<WTF::RefPtr<WTF::UniquedStringImpl, WTF::DumbPtrTraits<WTF::UniquedStringImpl> >, JSC::SymbolTableEntry, JSC::IdentifierRepHash, WTF::HashTraits<WTF::RefPtr<WTF::UniquedStringImpl, WTF::DumbPtrTraits<WTF::UniquedStringImpl> > >, JSC::SymbolTableIndexHashTraits>::HashMap()
3   0x11668fc05 WTF::HashMap<WTF::RefPtr<WTF::UniquedStringImpl, WTF::DumbPtrTraits<WTF::UniquedStringImpl> >, JSC::SymbolTableEntry, JSC::IdentifierRepHash, WTF::HashTraits<WTF::RefPtr<WTF::UniquedStringImpl, WTF::DumbPtrTraits<WTF::UniquedStringImpl> > >, JSC::SymbolTableIndexHashTraits>::HashMap()
4   0x11668fa6e JSC::SymbolTable::SymbolTable(JSC::VM&)
5   0x11668fc4d JSC::SymbolTable::SymbolTable(JSC::VM&)
6   0x11580d3a1 JSC::SymbolTable::create(JSC::VM&)
7   0x116690951 JSC::SymbolTable::cloneScopePart(JSC::VM&)
8   0x11575434c JSC::CodeBlock::setConstantRegisters(WTF::Vector<JSC::WriteBarrier<JSC::Unknown, WTF::DumbValueTraits<JSC::Unknown> >, 0ul, WTF::CrashOnOverflow, 16ul> const&, WTF::Vector<JSC::SourceCodeRepresentation, 0ul, WTF::CrashOnOverflow, 16ul> const&)

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