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- W332302499 abstract "Analysis of large physics data sets is a major computing task at Fermilab. One step in such an analysis involves culling ``interesting`` events via the use of complex query criteria. What makes this unusual is the scale required: 100`s of gigabytes of event data must be scanned at 10`s of megabytes per second for the typical queries that are applied, and data must be extracted from 10`s of terabytes based on the result of the query. The Physics Object Persistency Manager (POPM) system is a solution tailored to this scale of problem. A running POPM environment can support multiple queries in progress, each scanning at rates exceeding 10 megabytes per second, all of which are sharing access to a very large persistent address space distributed across multiple disks on multiple hosts. Specifically, POPM employs the following techniques to permit this scale of performance and access: Persistent objects: Experimental data to be scanned is ``populated`` as a data structure into the persistent address space supported by POPM. C++ classes with a few key overloaded operators provide nearly transparent semantics for access to the persistent storage. Distributed and parallel I/O: The persistent address space is automatically distributed across disks of multiple ``I/O nodes`` within the POPM system. A striping unit concept is implemented in POPM, permitting fast parallel I/O across the storage nodes, even for small single queries. Efficient Shared access: POPM implements an efficient mechanism for arbitration and multiplexing of I/O access among multiple queries on the same or separate compute nodes." @default.
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- W332302499 date "1996-01-01" @default.
- W332302499 modified "2023-09-27" @default.
- W332302499 title "POPE: A distributed query system for high performance analysis of very large persistent object stores" @default.
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