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Htmlunit tuning#715

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rbri merged 19 commits intoHtmlUnit:masterHtmlUnit/htmlunit:masterfrom rschwietzke:htmlunit-tuning-master-rebaserschwietzke/htmlunit:htmlunit-tuning-master-rebaseCopy head branch name to clipboardJan 28, 2024

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Commits on Jan 27, 2024

• Globally shared caches have to be thread-safe, if it is static, it is

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• Only keep a hashmap for a namespace if we need it

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• ConcurrentHashmap is more efficent than a classic synchronized map

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• Synchronization for changing a reference on a clone that is only known to the thread that created it, removed.

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• The clone might want to have the same synchronized list as the source

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• Attempt to use a CopyOnWriteArrayList instead of two lists and sychronized, but churns too much memory when we need a fail-safe iterator

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• Revert "Attempt to use a CopyOnWriteArrayList instead of two lists and sychronized, but churns too much memory when we need a fail-safe iterator"

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• Save references, a dedicated lock and a second holder object, listener lists should not be insanely large and hence we can remove by iterating

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• Different concept for an ordered map that avoid the need for an extra index based structure later, less memory when in use, based on FashHashMap with futher footprint reduction

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• JavaScript mimetype lookup via FashHashMap and upper and lowercasing by default, only in case we don't find anything, we go the lowercasing and comparision route

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• Removed lowercase caching. Memory access for a large random map, especially when also shared, is more expensive than a potential lower casing operation which in most case might not be needed at all.

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• Just run a cheap check first before comparing stuff

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• Using OrderHashMap instead of LinkedHashMap plus List

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• List should be cheaper than a map for the expected data amount even when asking contains or get due to the more likely cache misses when jumping into an array of hashes

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• Lookup of elements is more efficient now

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• Added performance idea notepad

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• Fixed merge issue

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• Fixing ordered map growth and assuring it is not stuck when looking up content beyond the original position

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• Styleguide updates

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