NDLI: Separating data and control transfer in distributed operating systems

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Separating data and control transfer in distributed operating systems

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Separating data and control transfer in distributed operating systems

Content Provider	ACM Digital Library
Author	Thekkath, Chandramohan A. Levy, Henry M. Lazowska, Edward D.
Abstract	Advances in processor architecture and technology have resulted in workstations in the 100+ MIPS range. As well, newer local-area networks such as ATM promise a ten- to hundred-fold increase in throughput, much reduced latency, greater scalability, and greatly increased reliability, when compared to current LANs such as Ethernet.We believe that these new network and processor technologies will permit tighter coupling of distributed systems at the hardware level, and that distributed systems software should be designed to benefit from that tighter coupling. In this paper, we propose an alternative way of structuring distributed systems that takes advantage of a communication model based on remote network access (reads and writes) to protected memory segments.A key feature of the new structure, directly supported by the communication model, is the separation of data transfer and control transfer. This is in contrast to the structure of traditional distributed systems, which are typically organized using message passing or remote procedure call (RPC). In RPC-style systems, data and control are inextricably linked—all RPCs must transfer both data and control, even if the control transfer is unnecessary.We have implemented our model on DECstation hardware connected by an ATM network. We demonstrate how separating data transfer and control transfer can eliminate unnecessary control transfers and facilitate tighter coupling of the client and server. This has the potential to increase performance and reduce server load, which supports scaling in the face of an increasing number of clients. For example, for a small set of file server operations, our analysis shows a 50% decrease in server load when we switched from a communications mechanism requiring both control transfer and data transfer, to an alternative structure based on pure data transfer.
Starting Page	2
Ending Page	11
Page Count	10
File Format	PDF
ISBN	0897916603
DOI	10.1145/195473.195481
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	1994-11-01
Publisher Place	New York
Access Restriction	Subscribed
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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