./fix-syntax ./prism --javamaxmem 11g nand.prism nand.props --property reliable -const N=60,K=4 -sparse -bgs
Select best engine and backwards Gauss-Seidel as solution method, as the model is acyclic
PRISM
=====
Version: 4.4.dev
Date: Mon Dec 10 20:43:02 CET 2018
Hostname: qcomp2019
Memory limits: cudd=1g, java(heap)=1g
Command line: prism --javamaxmem 11g nand.prism nand.props --property reliable -const 'N=60,K=4' -sparse -bgs
Parsing model file "nand.prism"...
Parsing properties file "nand.props"...
1 property:
(1) "reliable": P=? [ F s=4&z/N<0.1 ]
Type: DTMC
Modules: multiplex
Variables: u c s z zx zy x y
---------------------------------------------------------------------
Model checking: "reliable": P=? [ F s=4&z/N<0.1 ]
Model constants: N=60,K=4
Building model...
Model constants: N=60,K=4
Computing reachable states...
Reachability (BFS): 2162 iterations in 11.81 seconds (average 0.005463, setup 0.00)
Time for model construction: 12.308 seconds.
Type: DTMC
States: 18826082 (1 initial)
Transitions: 29772212
Transition matrix: 97452 nodes (1103 terminal), 29772212 minterms, vars: 33r/33c
Prob0: 2162 iterations in 10.68 seconds (average 0.004940, setup 0.00)
Prob1: 1945 iterations in 9.92 seconds (average 0.005101, setup 0.00)
yes = 547, no = 1757695, maybe = 17067840
Computing remaining probabilities...
Engine: Sparse
Building sparse matrix... [n=18826082, nnz=26994875] [326.9 MB]
Creating vector for diagonals... [dist=1, compact] [35.9 MB]
Creating vector for RHS... [dist=2, compact] [35.9 MB]
Allocating iteration vector... [143.6 MB]
TOTAL: [542.3 MB]
Starting iterations...
Backwards Gauss-Seidel: 2 iterations in 8.52 seconds (average 0.241000, setup 8.03)
Value in the initial state: 0.6867214589192238
Time for model checking: 29.983 seconds.
Result: 0.6867214589192238 (value in the initial state)
Overall running time: 42.846 seconds.