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53 lines
1.1 KiB
53 lines
1.1 KiB
// polling example [IT90]
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// gxn/dxp 26/01/00
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ctmc
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const int N = 2;
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const double mu = 1;
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const double gamma = 200;
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const double lambda = mu/N;
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module server
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s : [1..2]; // station
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a : [0..1]; // action: 0=polling, 1=serving
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[loop1a] (s=1)&(a=0) -> gamma : (s'=s+1);
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[loop1b] (s=1)&(a=0) -> gamma : (a'=1);
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[serve1] (s=1)&(a=1) -> mu : (s'=s+1)&(a'=0);
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[loop2a] (s=2)&(a=0) -> gamma : (s'=1);
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[loop2b] (s=2)&(a=0) -> gamma : (a'=1);
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[serve2] (s=2)&(a=1) -> mu : (s'=1)&(a'=0);
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endmodule
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module station1
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s1 : [0..1]; // state of station: 0=empty, 1=full
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[loop1a] (s1=0) -> 1 : (s1'=0);
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[] (s1=0) -> lambda : (s1'=1);
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[loop1b] (s1=1) -> 1 : (s1'=1);
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[serve1] (s1=1) -> 1 : (s1'=0);
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endmodule
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// construct further stations through renaming
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module station2 = station1 [ s1=s2, loop1a=loop2a, loop1b=loop2b, serve1=serve2 ] endmodule
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// (cumulative) rewards
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// expected time station 1 is waiting to be served
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rewards "waiting"
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s1=1 & !(s=1 & a=1) : 1;
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endrewards
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// expected number of times station 1 is served
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rewards "served"
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[serve1] true : 1;
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endrewards
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label "target" = s=1&a=0;
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