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Updates to cluster example. 

git-svn-id: https://www.prismmodelchecker.org/svn/prism/prism/trunk@280 bbc10eb1-c90d-0410-af57-cb519fbb1720
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Dave Parker 19 years ago
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2 changed files with 97 additions and 90 deletions
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  1. 49
      prism-examples/cluster/cluster.csl
  2. 106
      prism-examples/cluster/cluster.sm

49
prism-examples/cluster/cluster.csl
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@ -1,45 +1,52 @@
// properties from [HHK00]
// Properties based on those from [HHK00]
// left_operational_i : left_n>=i & Toleft_n
// right_operational_i : right_n>=i & Toright_n
// operational_i : (left_n+right_n)>=i & Toleft_n & line_n & Toright_n
// left_operational_i : left_n>=i & toleft_n
// right_operational_i : right_n>=i & toright_n
// operational_i : (left_n+right_n)>=i & toleft_n & line_n & toright_n
// minimum_k : left_operational_k | right_operational_k | operational_k
// premium = minimum_N
label "minimum" = (left_n>=k & Toleft_n) | (right_n>=k & Toright_n) | ((left_n+right_n)>=k & Toleft_n & line_n & Toright_n);
label "premium" = (left_n>=left_mx & Toleft_n) | (right_n>=right_mx & Toright_n) | ((left_n+right_n)>=left_mx & Toleft_n & line_n & Toright_n);
label "minimum" = (left_n>=k & toleft_n) | (right_n>=k & toright_n) | ((left_n+right_n)>=k & toleft_n & line_n & toright_n);
label "premium" = (left_n>=left_mx & toleft_n) | (right_n>=right_mx & toright_n) | ((left_n+right_n)>=left_mx & toleft_n & line_n & toright_n);
const double T;
// in the long run, the probability that premium QOS will be delivered
// In the long run, the probability that premium QoS will be delivered
S=? [ "premium" ]
// in the long run, the chance that QOS is below minimum
// In the long run, the chance that QoS is below minimum
S=? [ !"minimum" ]
// the system will always be able to offer premium QOS at some point in the future
// The system will always be able to offer premium QoS at some point in the future
P>=1 [ true U "premium" ]
// the chance that QOS drops below minimum quality within T time units (from the initial state)
// The chance that QoS drops below minimum quality within T time units
// (from the initial state)
P=? [ true U<=T !"minimum" ]
// if facing insufficient QOS, the maximum probability of facing the same problem after T time units
// If facing insufficient QoS, the maximum probability of facing
// the same problem after T time units
P=? [ true U[T,T] !"minimum" {!"minimum"}{max} ]
// the minimum probability of going from minimum QOS to premium QOS within T time units
// The minimum probability of going from minimum QoS to premium QoS
// within T time units
P=? [ true U<=T "premium" {"minimum"}{min} ]
// the minimum probability of going from minimum QOS to premium QOS within T time units without violating the minimum QOS constraint along the way
// The minimum probability of going from minimum QoS to premium QoS
// within T time units without violating the minimum QoS constraint along the way
P=? [ "minimum" U<=T "premium" {"minimum"}{min} ]
// the maximum probability that it takes more than T time units to recover from insufficient QOS
// The maximum probability that it takes more than T time units
// to recover from insufficient QoS
P=? [ !"minimum" U>=T "minimum" {!"minimum"}{max} ]
// percentage of operational workstations at time T starting from below minimum QOS
R{"per_oper"}=? [ I=T {!"minimum"}{min} ]
// The minimum percentage of operational workstations at time T
// when starting from below minimum QoS
R{"percent_op"}=?[ I=T {!"minimum"}{min} ]
// The expected time (from the initial state)
// that the system spends below minimum QoS until time T
R{"time_not_min"}=?[ C<=T ]
// from the inital state the expected time that the system is below minimum QOS until time T
R{"below_min"}=? [ C<=T ]
// The expected number of repairs by time T (starting in the initial state)
R{"num_repairs"}=?[ C<=T ]
// from the inital state the expected number of repairs by time T
R{"repairs"}=? [ C<=T ]

106
prism-examples/cluster/cluster.sm
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@ -1,36 +1,36 @@
// workstation cluster [HHK00]
// Workstation cluster [HHK00]
// dxp/gxn 11/01/00
ctmc
const int N; // number of workstations in each cluster
const int left_mx = N; // number of work stations in left cluster
const int right_mx = N; // number of work stations in right cluster
const int N; // Number of workstations in each cluster
const int left_mx = N; // Number of work stations in left cluster
const int right_mx = N; // Number of work stations in right cluster
// minimum QOS requires 3/4*N connected workstations operational
// Minimum QoS requires 3/4 connected workstations operational
const int k = floor(0.75*N);
formula minimum = (left_n>=k & Toleft_n) |
(right_n>=k & Toright_n) |
((left_n+right_n)>=k & Toleft_n & line_n & Toright_n);
formula minimum = (left_n>=k & toleft_n) |
(right_n>=k & toright_n) |
((left_n+right_n)>=k & toleft_n & line_n & toright_n);
// rates
const double line_rate = 0.0002;
const double Toleft_rate = 0.00025;
const double Toright_rate = 0.00025;
// Failure rates
const double ws_fail = 1/500; // Single workstation: average time to fail = 500 hrs
const double switch_fail = 1/4000; // Switch: average time to fail = 4000 hrs
const double line_fail = 1/5000; // Backbone: average time to fail = 5000 hrs
// left cluster
// Left cluster
module Left
left_n : [0..left_mx] init left_mx; // number of workstations operational
left : bool; // being repaired?
left_n : [0..left_mx] init left_mx; // Number of workstations operational
left : bool; // Being repaired?
[startLeft] !left & (left_n<left_mx) -> 1 : (left'=true);
[repairLeft] left & (left_n<left_mx) -> 1 : (left'=false) & (left_n'=left_n+1);
[] (left_n>0) -> 0.002*left_n : (left_n'=left_n-1);
[] (left_n>0) -> ws_fail*left_n : (left_n'=left_n-1);
endmodule
// right cluster
// Right cluster
module Right = Left[left_n=right_n,
left=right,
left_mx=right_mx,
@ -38,70 +38,70 @@ module Right = Left[left_n=right_n,
repairLeft=repairRight ]
endmodule
// repair unit
// Repair unit
module Repairman
r : bool; // repairing?
r : bool; // Repairing?
[startLeft] !r -> 10 : (r'=true); // inspect Left
[startRight] !r -> 10 : (r'=true); // inspect Right
[startToLeft] !r -> 10 : (r'=true); // inspect ToLeft
[startToRight] !r -> 10 : (r'=true); // inspect ToRight
[startLine] !r -> 10 : (r'=true); // inspect Line
[startLeft] !r -> 10 : (r'=true); // Inspect Left
[startRight] !r -> 10 : (r'=true); // Inspect Right
[startToLeft] !r -> 10 : (r'=true); // Inspect ToLeft
[startToRight] !r -> 10 : (r'=true); // Inspect ToRight
[startLine] !r -> 10 : (r'=true); // Inspect Line
[repairLeft] r -> 2 : (r'=false); // repair Left
[repairRight] r -> 2 : (r'=false); // repair Right
[repairToLeft] r -> 0.25 : (r'=false); // repair ToLeft
[repairToRight] r -> 0.25 : (r'=false); // repair ToRight
[repairLine] r -> 0.125 : (r'=false); // repair Line
[repairLeft] r -> 2 : (r'=false); // Repair Left
[repairRight] r -> 2 : (r'=false); // Repair Right
[repairToLeft] r -> 0.25 : (r'=false); // Repair ToLeft
[repairToRight] r -> 0.25 : (r'=false); // Repair ToRight
[repairLine] r -> 0.125 : (r'=false); // Repair Line
endmodule
// line/backbone
// Line/backbone
module Line
line : bool; // being repaired?
line_n : bool init true; // working?
line : bool; // Being repaired?
line_n : bool init true; // Working?
[startLine] !line & !line_n -> 1 : (line'=true);
[repairLine] line & !line_n -> 1 : (line'=false) & (line_n'=true);
[] line_n -> line_rate : (line_n'=false);
[] line_n -> line_fail : (line_n'=false);
endmodule
// left switch
module ToLeft = Line[line=Toleft,
line_n=Toleft_n,
line_rate=Toleft_rate,
// Left switch
module ToLeft = Line[line=toleft,
line_n=toleft_n,
line_fail=switch_fail,
startLine=startToLeft,
repairLine=repairToLeft ]
endmodule
// right switch
module ToRight = Line[line=Toright,
line_n=Toright_n,
line_rate=Toright_rate,
// Right switch
module ToRight = Line[line=toright,
line_n=toright_n,
line_fail=switch_fail,
startLine=startToRight,
repairLine=repairToRight ]
endmodule
// reward structures
// Reward structures
// percentage of operational workstations stations
rewards "per_oper"
// Percentage of operational workstations stations
rewards "percent_op"
true : 100*(left_n+right_n)/(2*N);
endrewards
// time spent below minimum QoS
rewards "below_min"
// Time that the system is not delivering at least minimum QoS
rewards "time_not_min"
!minimum : 1;
endrewards
// number of repairs
rewards "repairs"
[repairLeft] REPAIR : 1;
[repairRight] REPAIR : 1;
[repairToLeft] REPAIR : 1;
[repairToRight] REPAIR : 1;
[repairLine] REPAIR : 1;
// Number of repairs
rewards "num_repairs"
[repairLeft] true : 1;
[repairRight] true : 1;
[repairToLeft] true : 1;
[repairToRight] true : 1;
[repairLine] true : 1;
endrewards
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