On Tuesday, October 20, 2020 3:36 PM, Dan Williams <dan.j.williams@xxxxxxxxx> wrote: > > What does Linux get from merging mpool? > What Linux gets from merging mpool is a generic object store target with some unique and beneficial features: - the ability to allocate objects from multiple classes of media - facilities to memory-map (and unmap) collections of related objects with similar lifetimes in a single call - proactive eviction of object data from the page cache which takes into account these object relationships and lifetimes - concurrent access to object data directly and memory mapped to eliminate page cache pollution from background operations - a management model that is intentionally patterned after LVM so as to feel familiar to Linux users The HSE storage engine, which is built on mpool, consistently demonstrates throughputs and latencies in real-world applications that are multiples better than common alternatives. We believe this represents a concrete example of the benefits of the mpool object store. That said, we are very open to ideas on how we can improve the mpool implementation to be better aligned with existing Linux I/O mechanisms. Thanks, Nabeel
