Author: Westervelt, R.
Paper Title Page
S08NC10 Network Performance for Graphical Control Systems 326
 
  • P.N. Clout, M. Geib, R. Westervelt
    VISTA, Los Alamos, NM, USA
  
  Vsys­tem is a tool­box for build­ing graph­i­cally-based con­trol sys­tems. The real-time data­base com­po­nent, Vac­cess, in­cludes all the net­work­ing sup­port nec­es­sary to build multi-com­puter con­trol sys­tems. Vac­cess has two modes of data­base ac­cess, syn­chro­nous and asyn­chro­nous. Vdraw is an­other com­po­nent of Vsys­tem that al­lows de­vel­op­ers and users to de­velop con­trol screens and win­dows by draw­ing rather than pro­gram­ming. Based on Xwin­dows, Vsys­tem pro­vides the pos­si­bil­ity of run­ning Vdraw ei­ther on the work­sta­tion with the graph­ics or on the com­puter with the data­base. We have made some mea­sure­ments on the cpu load­ing, elapsed time and the net­work load­ing to give some guid­ance in sys­tem con­fig­u­ra­tion per­for­mance. It will be seen that asyn­chro­nous net­work ac­cess gives large per­for­mance in­creases and that the net­work data­base change no­ti­fi­ca­tion pro­to­col can be ei­ther more or less ef­fi­cient than the X-win­dow net­work pro­to­col, de­pend­ing on the graph­i­cal rep­re­sen­ta­tion of the data.  
DOI • reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S08NC10  
About • Received ※ 11 November 1991 — Accepted ※ 20 November 1991 — Issued ※ 04 December 1992  
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