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[mono] Migrate various GHashTables to dn_simdhash - #100497
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This was referenced Apr 4, 2024
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Checkpoint Checkpoint Checkpoint Checkpoint Checkpoint Checkpoint Checkpoint Checkpoint Checkpoint Add missing files Checkpoint Add missing header Cleanups and more comments Checkpoint Fix insertion Remove generic add and get, they complicate everything for no reason Build fix Build fixes Cleanup When cascading, wrap around to the first bucket when we reach the end. This reduces wasted space a lot. Simplify declaring specializations Cleanup Convert spaces to tabs Rearrange things so that find_first_matching_suffix gets inlined Basic removal implementation Expand tests Build fixes Cleanup MSVC doesn't support warning preprocessor command so use pragma message Fix build Fix build Fix linker problem by defining string comparison and hasher inline Match semantics of ghashtable better Checkpoint dn_allocator allocations aren't zeroed :) Cleanup Use dn_simdhash_string_ptr for namespace lookup cache Fix build Allow hiding the default specializations of a simdhash so you can wrap them Make simdhash_string_ptr pre-compute and cache the length of the string Cache the hashcode of keys in string_ptr since it makes natural cache alignment possible and speeds up rehashing Rearrange things to fix C4505 Prohibit declaring multiple specializations in one .c file since it would cause duplicate includes Maybe fix duplicate include Fix use of base foreach for string_ptr hashtable Annotate fallthrough in murmurhash for clang Manually unroll the murmurhash3 duff's device to satisfy clang Oops Fix leaked dn_simdhash_t instance Cleanup Fix truncation warning with 64-bit strlen Workaround linux x64 linker problem Fix GCC build parse error Cleanup & rearrange things; attempt to fix GCC build Updates so test suite works again; verified on linux x64 gcc Fix indentation Cleanup Fix foreaches Split architecture-specific stuff into its own header Specializing foreach means key_is_pointer/value_is_pointer aren't needed Cleanup Simplify preprocessor token gluing Cleanup and improve comments Align the address of the first bucket Comment out neon for now Cleanup Alignment and arch-specific pointer size fixes Fix ARM clang/gcc build Maybe fix CI-specific build issue MSVC docs were wrong :( Cleanup Silence MSVC warnings again Rework string_ptr to avoid pre-computing string length, and use a streaming reformulation of MurmurHash3-32 Cleanup Add dn_simdhash_u32_ptr and use it in mono_image_init_name_cache Add missing file Fix type mismatch No need to eagerly load the suffixes, and doing so makes scalar fallback codegen much worse Optimize scalar fallback Migrate all simdhash fixes and changes from simdhash-2 into simdhash PR #1 Enable ARM NEON support in simdhash since we have system headers now Update utils header from successor branch Dedupe + improve 64-bit pointer hash Fix windows build Address PR feedback Do some calculations using uint64_t and bounds check before converting back to uint32_t Do some key calculations using size_t Introduce dn_simdhash_assert and use it instead of assert Broken attempt at configurable assertions Add ptr_ptr simdhash variant Use simdhash for interp patch_sites_table Migrate method and methodref cache to simdhash Add missing include, fix typo Migrate data_hash and patchsite_hash to simdhash Refactoring, add support for remove callback Add ghashtable-compatible simdhash variant Migrate 3 tables to dn_simdhash_ght Change cascade flag into a cascade counter, and clean it up when removing items Fix cascade counters potentially getting corrupt when trying to add duplicate keys Attempt to optimize ght variant a little Correct semantics in get_data_item_wide_index Migrate bundled_resources to ght and optimize its hash and key comparer Pre-reserve capacity for some simdhash instances that grow during startup Reduce initial size of these simdhashes because we have one instance per assembly Fix bundled_resources by adding ANOTHER hash table Migrate MonoJitMemoryManager::seq_points to simdhash Add equivalent operation for g_hash_table_insert_replace Rename simdhash replace operation to make it clear that it only replaces the value Adjust modified code to have the same overwrite behavior as the old g_hash_table Probably meaningless semantic tweak for replace handler Migrate jit_code_hash and interp_code_hash to simdhash_ptr_ptr Add safety check Wrap dn_simdhash_ght_foreach in a COMPONENT_API wrapper so debugger-engine can access it across a linking boundary Bring back the InternalHashTables, removing them had performance consequences I can't identify the cause of Fix test Optimize pointer hash (testing) force-enable wasm simd for simdhash Wasm simd codegen tweak Optimize simdhash search Refactorings and possible speedup Optimize bucket scanning Bucket scan optimization Repair merge damage Repair merge damage
This was referenced Apr 20, 2024
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Migrates various GHashTables in the mono runtime over to dn_simdhash, and optimizes a couple specific spots in the process - in particular bundled resources, which had a very expensive compare function and hash function for keys.
Opening now to run CI tests so I can investigate any broken tests locally. I probably did other stuff in this branch that I can't remember, but it'll be obvious once the parent branch is squashed and I review the diff again...
There are more hash tables in mono that might be profitable to migrate based on profiling, but they're more complex scenarios, i.e. internal hash tables or concurrent hash tables, so I opted not to do them in this PR. In one case when I tried migrating one of them, things actually got slower.