文档介绍：A Characterization of Processor Performance in the VAX-11/780
Joel S. Emer Douglas W. Clark
Digital Equipment Corp. Digital Equipment Corp.
77 Reed Road 295 Foster Street
Hudson, MA 01749 Littleton, MA 01460
ABSTRACT
effect of many architectural and implementation
features.
This paper reports the results of a study of VAX-
11/780 processor performance using a novel hardware Prior related work includes studies of opcode
monitoring technique. A micro-PC histogram frequency and other features of instruction-
monitor was built for these measurements. It keeps a processing [10, 11, 15, 16]; some studies report timing
count of the number of microcode cycles executed at information as well [1, 4, 12].
each microcode location. Measurement experiments
were performed on live timesharing workloads as After describing our methods and workloads in
well as on synthetic workloads of several types. The Section 2, we will report the frequencies of various
histogram counts allow the calculation of the processor events in Sections 3 and 4. Section 5
frequency of various architectural events, such as the resents plete, detailed timing results, and
frequency of different types of opcodes and operand ection 6 concludes the paper.
specifiers, as well as the frequency of some
implementation-specific events, such as translation
buffer misses.