PRISM
=====
Version: 4.5.dev
Date: Sat Mar 14 23:49:08 UTC 2020
Hostname: e72bdd194fc5
Memory limits: cudd=4g, java(heap)=11g
Command line: prism -javamaxmem 11g -cuddmaxmem 4g -heuristic speed -e 1e-6 -maxiters 1000000 wlan.4.prism wlan.props --property cost_min -const COL=0
Parsing model file "wlan.4.prism"...
Type: MDP
Modules: medium station1 station2
Variables: col c1 c2 x1 s1 slot1 backoff1 bc1 x2 s2 slot2 backoff2 bc2
Parsing properties file "wlan.props"...
7 properties:
(1) "collisions": Pmax=? [ F col=COL ]
(2) "cost_max": R{"cost"}max=? [ F s1=12&s2=12 ]
(3) "cost_min": R{"cost"}min=? [ F s1=12&s2=12 ]
(4) "num_collisions": R{"collisions"}max=? [ F s1=12&s2=12 ]
(5) "sent": P>=1 [ F s1=12&s2=12 ]
(6) "time_max": R{"time"}max=? [ F s1=12&s2=12 ]
(7) "time_min": R{"time"}min=? [ F s1=12&s2=12 ]
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Model checking: "cost_min": R{"cost"}min=? [ F s1=12&s2=12 ]
Model constants: COL=0
Warning: Switching to sparse engine and (backwards) Gauss Seidel (default for heuristic=speed).
Building model...
Model constants: COL=0
Computing reachable states...
Reachability (BFS): 145 iterations in 0.27 seconds (average 0.001862, setup 0.00)
Time for model construction: 0.407 seconds.
Type: MDP
States: 345000 (1 initial)
Transitions: 762252
Choices: 440206
Transition matrix: 14365 nodes (6 terminal), 762252 minterms, vars: 43r/43c/7nd
Prob0A: 797 iterations in 6.12 seconds (average 0.007680, setup 0.00)
Prob1E: 798 iterations in 7.36 seconds (average 0.009226, setup 0.00)
Warning: PRISM hasn't checked for zero-reward loops.
Your minimum rewards may be too low...
goal = 1, inf = 0, maybe = 344999
Computing remaining rewards...
Engine: Sparse
Building sparse matrix (transitions)... [n=345000, nc=440205, nnz=762251, k=3] [11.7 MB]
Building sparse matrix (transition rewards)... [n=345000, nc=440205, nnz=93239, k=3] [4.1 MB]
Creating vector for state rewards... [2.6 MB]
Creating vector for inf... [2.6 MB]
Allocating iteration vectors... [2 x 2.6 MB]
TOTAL: [26.3 MB]
Starting iterations...
Iteration 637: max relative diff=0.120332, 5.01 sec so far
Iterative method: 818 iterations in 7.02 seconds (average 0.007809, setup 0.63)
Value in the initial state: 7625.0
Time for model checking: 20.351 seconds.
Result: 7625.0 (value in the initial state)
Overall running time: 21.383 seconds.
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Note: There were 2 warnings during computation.