While crossbeam_skiplist::SkipMap and std::collections::BTreeMap are solid choices for a general-purpose ordered map, they may not be ideal for a database environment. This is primarily due to its reliance on dynamic memory allocations for each entry, leading to non-contiguous memory layouts. In a database scenario, where performance and efficient memory usage are critical, this can become a bottleneck.
The lack of contiguous memory means that pointer chasing occurs frequently during lookups, increasing cache misses and search times. This added overhead can significantly impact performance when performing large-scale or frequent queries.
In contrast, skl::SkipMap provides a more suitable approach for database environments because it stores entries in a continuous memory buffer, reducing the need for frequent allocations. This leads to better cache locality and faster search operations, making skl::SkipMap a more performant choice in cases where minimizing memory overhead and maximizing search efficiency are crucial, such as in database systems.
Hence, in 0.5, the sidecar of the write-ahead log will be changed to skl::SkipMap.
While
crossbeam_skiplist::SkipMap
andstd::collections::BTreeMap
are solid choices for a general-purpose ordered map, they may not be ideal for a database environment. This is primarily due to its reliance on dynamic memory allocations for each entry, leading to non-contiguous memory layouts. In a database scenario, where performance and efficient memory usage are critical, this can become a bottleneck.The lack of contiguous memory means that pointer chasing occurs frequently during lookups, increasing cache misses and search times. This added overhead can significantly impact performance when performing large-scale or frequent queries.
In contrast,
skl::SkipMap
provides a more suitable approach for database environments because it stores entries in a continuous memory buffer, reducing the need for frequent allocations. This leads to better cache locality and faster search operations, makingskl::SkipMap
a more performant choice in cases where minimizing memory overhead and maximizing search efficiency are crucial, such as in database systems.Hence, in
0.5
, the sidecar of the write-ahead log will be changed toskl::SkipMap
.