Results for Summer 2013 CAP 4800 Project - Server trace case
------------------------------------------------------------

Execution output:

  =============================================================
  ==         *** Model of a cluster of servers ***           ==
  =============================================================
  = N                = 10 nodes
  = Mu               = 5.000000 req/sec
  = SAMPLE_INTERVAL  = 60.000000 sec
  = LOW_THRESH       = 7.100000 %
  = HIGH_THRESH      = 7.200000 %
  = INCREMENT        = 1
  = DECREMENT        = 1
  =============================================================
  = Total CPU time   = 4.555000 sec
  = Total sim time   = 2579428.218140 sec
  =------------------------------------------------------------
  = >>> Simulation results                                    -
  =------------------------------------------------------------
  = Mean number active = 3.246290 nodes
  = Mean response time = 0.233915 sec
  = 50% response time  = 0.200000 sec
  = 98% response time  = 0.332041 sec
  = 99% response time  = 0.498199 sec
  =------------------------------------------------------------
                CSIM Simulation Report (Version 19.0 for Borland C)

                             Mon May 27 19:45:05 2013


                       Ending simulation time:   2579428.218
                       Elapsed simulation time:  2579428.218
                       CPU time used (seconds):        4.555


  FACILITY SUMMARY

  facility     service    service          through-    queue     response   compl
  name           disc      time    util.     put       length      time     count
  --------------------------------------------------------------------------------
  Server for   fcfs       0.20000  0.062    0.31232    0.09797    0.31370   805604
  Server for   fcfs       0.20000  0.046    0.22893    0.05210    0.22759   590517
  Server for   fcfs       0.20000  0.035    0.17632    0.03556    0.20168   454794
  Server for   fcfs       0.20000  0.028    0.14045    0.02817    0.20058   362288
  Server for   fcfs       0.20000  0.023    0.11292    0.02260    0.20010   291272
  Server for   fcfs       0.20000  0.018    0.09035    0.01807    0.20003   233047
  Server for   fcfs       0.20000  0.014    0.07082    0.01416    0.20001   182674
  Server for   fcfs       0.20000  0.011    0.05267    0.01053    0.20000   135859
  Server for   fcfs       0.20000  0.007    0.03681    0.00736    0.20000    94936
  Server for   fcfs       0.20000  0.005    0.02329    0.00466    0.20000    60065



  TABLE 1:  Table for number of active servers

        minimum         1.000000          mean                    3.246290
        maximum        10.000000          variance                8.044809
        range           9.000000          standard deviation      2.836337
        observations       42990          coefficient of var      0.873717

  TABLE 2:  Table for response time

        minimum         0.200000          mean                    0.233915
        maximum        28.673877          variance                0.291337
        range          28.473877          standard deviation      0.539757
        observations     3211056          coefficient of var      2.307493

Calculation of energy savings:
-----------------------------

  With 3.246 machines powered-on on average for 30 days the energy savings is
  as follows...

  Base case of 10 machines powered-on always:

    10 x 200 x 30 x 24 = 1440.0 kWh

  Policy case of 3.246 machines powered-on on average:

    (3.246 x 200 x 30 x 24) + ((10 - 3.246) x 5 x 30 x 24) = 491.7 kWh

  So, the energy savings is:

    1440.0 - 491.7 = 948.3 kWh (or about $95 per month at $0.10 per kWh)

---