[Perf] Don't allocate all rocksdb keys #2449
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Signed-off-by: ljedrz <ljedrz@gmail.com>
Signed-off-by: ljedrz <ljedrz@gmail.com>
howardwu
approved these changes
May 8, 2024
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Most of the rocksdb keys are relatively small, and we can avoid allocating them by using a
SmallVec. Based on the heap profilesjemallocis able to reuse this memory, but it costs CPU time to do so; also, such a change will reduce the number of (alloc-related) syscalls in non-Linux nodes.The size was chosen to be 64B, as this covers the most common key sizes (including the prefixes).