A sample path analysis of the delay in the M/G/C system

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Using sample path analysis we show that under the same load the mean delay in queue in the M/G/2 system is smaller than that in the corresponding M/G/1 system, when the service time has either the DMRL or NBU property and the service discipline is FCFS. The proof technique uses a new device that equalizes the work in a two server system with that in a single sterver system. Other interesting quantities such as the average difference in work between the two servers in the GI/G/2 system and an exact alternate derivation of the mean delay in the M/M/2 system from sample path analysis are presented. For the same load, we also show that the mean delay in the M/G/C system with general service time distribution is smaller than that in the M/G/1 system when the traffic intensity is less than 1/c.

Original languageEnglish (US)
Pages (from-to)256-266
Number of pages11
JournalJournal of Applied Probability
Issue number1
StatePublished - Mar 1996
Externally publishedYes


  • Bounds for mean delay
  • Multi-server queue
  • Sample path analysis

ASJC Scopus subject areas

  • Statistics and Probability
  • General Mathematics
  • Statistics, Probability and Uncertainty


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