[Webkit-unassigned] [Bug 186735] New: HTTPHeaderMap wastes 117KB of HashTable capacity on cnn.com

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=186735

            Bug ID: 186735
           Summary: HTTPHeaderMap wastes 117KB of HashTable capacity on
                    cnn.com
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Page Loading
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: simon.fraser at apple.com
                CC: beidson at apple.com

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

Wasted capacity: 117504 bytes (used 50816 of 168320 bytes, utilization: 30.19%) - 312 allocations
1   0x105db209d WTF::HashTable<WebCore::HTTPHeaderName, WTF::KeyValuePair<WebCore::HTTPHeaderName, WTF::String>, WTF::KeyValuePairKeyExtractor<WTF::KeyValuePair<WebCore::HTTPHeaderName, WTF::String> >, WTF::IntHash<WebCore::HTTPHeaderName>, WTF::HashMap<WebCore::HTTPHeaderName, WTF::String, WTF::IntHash<WebCore::HTTPHeaderName>, WTF::StrongEnumHashTraits<WebCore::HTTPHeaderName>, WTF::HashTraits<WTF::String> >::KeyValuePairTraits, WTF::StrongEnumHashTraits<WebCore::HTTPHeaderName> >::HashTable(WTF::HashTable<WebCore::HTTPHeaderName, WTF::KeyValuePair<WebCore::HTTPHeaderName, WTF::String>, WTF::KeyValuePairKeyExtractor<WTF::KeyValuePair<WebCore::HTTPHeaderName, WTF::String> >, WTF::IntHash<WebCore::HTTPHeaderName>, WTF::HashMap<WebCore::HTTPHeaderName, WTF::String, WTF::IntHash<WebCore::HTTPHeaderName>, WTF::StrongEnumHashTraits<WebCore::HTTPHeaderName>, WTF::HashTraits<WTF::String> >::KeyValuePairTraits, WTF::StrongEnumHashTraits<WebCore::HTTPHeaderName> > const&)
2   0x106550267 WTF::HashTable<WebCore::HTTPHeaderName, WTF::KeyValuePair<WebCore::HTTPHeaderName, WTF::String>, WTF::KeyValuePairKeyExtractor<WTF::KeyValuePair<WebCore::HTTPHeaderName, WTF::String> >, WTF::IntHash<WebCore::HTTPHeaderName>, WTF::HashMap<WebCore::HTTPHeaderName, WTF::String, WTF::IntHash<WebCore::HTTPHeaderName>, WTF::StrongEnumHashTraits<WebCore::HTTPHeaderName>, WTF::HashTraits<WTF::String> >::KeyValuePairTraits, WTF::StrongEnumHashTraits<WebCore::HTTPHeaderName> >::operator=(WTF::HashTable<WebCore::HTTPHeaderName, WTF::KeyValuePair<WebCore::HTTPHeaderName, WTF::String>, WTF::KeyValuePairKeyExtractor<WTF::KeyValuePair<WebCore::HTTPHeaderName, WTF::String> >, WTF::IntHash<WebCore::HTTPHeaderName>, WTF::HashMap<WebCore::HTTPHeaderName, WTF::String, WTF::IntHash<WebCore::HTTPHeaderName>, WTF::StrongEnumHashTraits<WebCore::HTTPHeaderName>, WTF::HashTraits<WTF::String> >::KeyValuePairTraits, WTF::StrongEnumHashTraits<WebCore::HTTPHeaderName> > const&)
3   0x1065501df WTF::HashMap<WebCore::HTTPHeaderName, WTF::String, WTF::IntHash<WebCore::HTTPHeaderName>, WTF::StrongEnumHashTraits<WebCore::HTTPHeaderName>, WTF::HashTraits<WTF::String> >::operator=(WTF::HashMap<WebCore::HTTPHeaderName, WTF::String, WTF::IntHash<WebCore::HTTPHeaderName>, WTF::StrongEnumHashTraits<WebCore::HTTPHeaderName>, WTF::HashTraits<WTF::String> > const&)
4   0x10654fb3f WebCore::HTTPHeaderMap::operator=(WebCore::HTTPHeaderMap const&)
5   0x10654f8d7 WebCore::ResourceResponseBase::operator=(WebCore::ResourceResponseBase const&)
6   0x106547177 WebCore::ResourceResponse::operator=(WebCore::ResourceResponse const&)
7   0x107f9cf12 WebCore::CachedResource::setResponse(WebCore::ResourceResponse const&)
8   0x107f98b2f WebCore::CachedResource::responseReceived(WebCore::ResourceResponse const&)

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