Data Rates Assessment on L2–L3 CPU Bus and Bus between CPU and RAM in Modern CPUs

Bus Adapter CPU RAM Disk Net Printer

The computational performance of multiprocessors continues to improve by leaps and bounds fueled in part by rapid improvements in processor and interconnection technology I O performance thus becomes ever more critical to avoid becoming the bottleneck of system performance In this paper we provide an introduction to I O architectural issues in multiprocessors with a focus on disk subsystems Whi...

System Bus Host Memory Main CPU Accelerator

Memory Banks Crossbar CTI Rings X - ring CTI CPU CPU PCI Bus

In this article we present results from an experimental evaluation study of the HP Exemplar le system. Our experiments consist of simple micro-benchmarks that study the impact of various factors on the le system performance. These factors include I/O request/buuer sizes, vectored/non-vectored access patterns, read-ahead policies, multi-threaded (temporally irregular) requests, and architectural...

Super-Scalar Database Compression between RAM and CPU Cache

Data-intensive query processing tasks like data mining, scientific data analysis, and decision support can leave a database system severely I/O-bound, even when common RAID configurations are used. Traditionally, this problem has been tackled by adding more and more disks, connected through expensive interconnect networks. This brute-force approach results in systems of which the price is domin...

Cpu Cpu 1 Cpu 2 Cpu

Coherent-cache shared-memory architectures often give disappointing performance which can be alleviated by manual tuning. We describe a new trace analysis tool, clarissa, which helps diagnose problems and pinpoint their causes. Unusually, clarissa works by analysing potential contention, instead of measuring predicted contention by simulating a speciic memory system design. This is important be...