Performance Tests - unodb-dev/unodb GitHub Wiki

Flavors

Concurrent ART flavor overhead in single threaded workloads

Code changes

2021-03-14: Effect of replacing RMW atomics with load non atomic modify store in OL critical sections
2021-04-22: Effect of removing std::uncaught_exceptions calls on OL obsoleting critical section enter and exit
2021-05-05: Effect of removing polymorphism on inode entry removal
2021-05-06: Effect of removing redundant nullptr checks in deleters
2021-05-11: Effect of annotating pmr_allocate with __attribute__((malloc,returns_nonnull))
2021-05-15: Effect of removing Node256 fullness check on add
2021-05-16: Effect of removing is_full dispatch on add node path
2021-05-26: Effect of removing node type check before growing inode
2021-05-28: Effect of merging find_child and add node type dispatch
2021-06-09: Effect of branching exactly once in remove code path
2021-06-10: Effect of initializing Node48 child_indexes at declaration
2021-06-21: Effect of removing branching on children_count in N4 insert_position_search
2021-06-29: Effect of SIMD'ing Node4 insert position search
2021-07-20: Effect of tagged node pointers
2021-09-20: Effect of LD_PRELOAD'ing jemalloc
2021-09-24: Effect of removing pool PMR allocators
2021-10-13: Effect of optimistic_lock::try_read_lock testing once in the straight path
2021-10-14: Effect of fully inlining try_read_unlock
2021-11-22: Effect of lock-free QSBR step 1
2021-11-22: Effect of lock-free QSBR step 2
2021-11-25: Effect of lock-free QSBR step 3
2021-11-26: Effect of lock-free QSBR step 4
2021-12-07: Effect of lock-free QSBR step 5
2021-12-17: Effect of lock-free QSBR step 6
2021-12-17: Effect of lock-free QSBR step 7
2021-12-17: Effect of lock-free QSBR step 8
2021-12-22: Effect of lock-free QSBR step 9
2021-12-23: Effect of lock-free QSBR step 10
2021-12-23: Effect of lock-free QSBR step 11
2021-12-23: Effect of lock-free QSBR step 12
2022-03-16: Effect of padding OLC ART counters
2022-04-22: Effect of AVX2 for Node48 insert position search
2022-04-29: Effect of Node48 AVX2 insert position search unrolling x2
2022-05-03: Effect of Node48 AVX2 insert position search unrolling x4
2022-05-04: Effect of simpler Node4 add_two_to_empty key2_i
2022-08-03: Effect of Node4 NEON search
2022-08-05: Effect of Node16 NEON search
2022-08-05: Effect of Node16 NEON search replacing uint128_t with a ternary
2022-08-07: Effect of Node48 NEON search
2022-08-11: Effect of Node48 NEON search unrolled x2
2025-01-30: Effect of replacing RMW with W in optimistic lock obsoletion
2025-01-30: Effect of replacing RMW with W in optimistic lock write unlock

Unmerged changes

2022-10-24: Effect of jemalloc sdallocx sized-free

Compilers

2021-05-23: Performance of LLVM 12 vs LLVM 11
2021-05-24: Performance of GCC 11 vs GCC 10
2022-07-04: Performance of LLVM 12 vs LLVM 11, take 2
2022-08-26: Performance of LLVM 13 vs LLVM 12
2022-08-31: Performance of LLVM 14 vs LLVM 13
2022-09-21: Performance of LLVM 15 vs LLVM 14
2022-10-04: Performance of GCC 12 vs GCC 11
2023-09-28: Performance of LLVM 16 vs LLVM 15
2023-10-10: Performance of LLVM 17 vs LLVM 16