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Conference rusure::math

Title:	Mathematics at DEC

Moderator:	RUSURE::EDP

Created:	Mon Feb 03 1986
Last Modified:	Fri Jun 06 1997
Last Successful Update:	Fri Jun 06 1997
Number of topics:	2083
Total number of notes:	14613

1181.0. "Help on queuing models" by EAGLE1::BEST (R D Best, sys arch, I/O) Thu Jan 11 1990 18:46

Where can I find expertise within the corporation on queuing models for
performance simulation ?

I'd like to get some help in making some modeling decisions on whether and how
I can aggregate characteristics of I/O subsystems to squish them on top
of an existing I/O performance model that uses the CSIM package.

I think I need (at least for now) to parameterise a cascade combination
of a CI link and an HSC controller.  I don't know enough about the subtleties
of queuing theory to judge the legitimacy of this.

T.R	Title	User	Personal Name	Date	Lines
1181.1	a pointer	VMSDEV::GARGEYA	Kamesh Gargeya	`Fri Jan 12 1990 17:20`	19
	there are several groups within the company (including mine) involved in building and using mathematical and/or simulation models to evaluate the performance of systems/subsystems. the assumptions being made and the "level" of detail of the model depend on the specific questions being answered using the models. what questions are you trying to answer using the model? members of the I/O performance group (located at CXO in Colorado) have built several models of the I/O subsystem and have captured the details of the HSC controller. you may want to contact ken bates (SSDEVO::) or dennis haugh (SSDEVO::) in the I/O performance group. if you still need help, feel free to contact me directly. regards, -- kamesh
1181.2		EAGLE1::BEST	R D Best, sys arch, I/O	`Fri Jan 12 1990 21:14`	1
	Thanks; I will try Ken and perhaps some other people in CXO.
1181.3		DWOVAX::YOUNG	If it bleeds, we can kill it.	`Sun Jan 14 1990 06:31`	4
	You might also try ATPS::PANG (Jee Pang) who has done similar work for the DECCP product. -- Barry
1181.4	A useful book..	SDOGUS::DRAKE	Dave (Diskcrash) Drake 619-268-2660	`Mon Jan 29 1990 00:50`	8
	There is a book available on the subject, somewhat old, but should be available through anyplace that carries Dover books. "Elements of Queueing Theory with Applications", Thomas L. Saaty ISBN 0-486-64553-3 We have used queueing models in the field to project IO capacity of disk drives under various loads. I wish more engineers had exposure to this stuff in order to stay out of trouble.....