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In persistent B+ -Tree, random updates of small key-value (KV) pairs will cause severe XPBuffer-induced write amplification (XBI-amplification) because CPU cacheline size is smaller than media access granularity in persistent memory (PM). We observe that XBI-amplification directly determines the application performance when the PM bandwidth is exhausted in multi-thread scenarios. However, none of the existing work can efficiently address the XBI-amplification issue while maintaining superior range query performance.
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Li et al. (2024) studied this question.
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