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Performance of Firefly RPC MICHAEL D. SCHROEDER and MICHAEL BURROWS
 

Summary: Performance of Firefly RPC
MICHAEL D. SCHROEDER and MICHAEL BURROWS
Digital Equipment Corporation
In this paper we report on the performance of the remote procedure call (RPC) implementation for
the Firefly multiprocessor and analyze the implementation to account precisely for all measured
latency. From the analysis and measurements, we estimate how much faster RPC could be if certain
improvements were made. The elapsed time for an intermachine call to a remote procedure that
accepts no arguments and produces no results is 2.66 ms. The elapsed time for an RPC that has a
single 1440-byte result (the maximum result that will fit in a single packet) is 6.35 ms. Maximum
intermachine throughput of application program data using RPC is 4.65 Mbits/s, achieved with four
threads making parallel RPCs that return the maximum-size result that fits in a single RPC result
packet. CPU utilization at maximum throughput is about 1.2 CPU seconds per second on the calling
machine and a little less on the server. These measurements are for RPCs from user space on one
machine to user space on another, using the installed system and a 10 Mbit/s Ethernet. The RPC
packet exchange protocol is built on IP/UDP, and the times include calculating and verifying UDP
checksums. The Fireflies used in the tests had 5 MicroVAX II processors and a DEQNA Ethernet
controller.
Categories and Subject Descriptors: C.2.4 [Computer-Communication Networks]: Distributed
Systems--network operating systems; C.4 [Computer Systems Organization]: Performance of
Systems-performance attributes; D.4.4 [Operating Systems]: Communications Management-

  

Source: Arpaci-Dusseau, Andrea - Department of Computer Sciences, University of Wisconsin at Madison
Newhall, Tia - Computer Science Department, Swarthmore College

 

Collections: Computer Technologies and Information Sciences