Closed 4er4er4er closed 7 months ago
When CBC hits a time limit set with lim:time, it displays an error message:
lim:time
ampl: model sched1.mod data sched.dat let least_assign := 14; ampl: option solver "..\cbc"; ampl: option cbc_options 'lim:time=10 int:logLevel=1'; ampl: solve; cbc 2.10.10: lim:time = 10 int:logLevel = 1 Welcome to the CBC MILP Solver Version: 2.10.10 Build Date: Apr 18 2023 command line - Cbc_C_Interface -logLevel 1 -log 0 -solve -quit (default Call failed: 'Cbc_solve(lp())' with code 1 ampl:
AMPL's timing parameters show that the time limit was reached, but all zeros were returned for the variables:
ampl: display _solve_time, _solve_elapsed_time; _solve_time = 10 _solve_elapsed_time = 10.063 ampl: display Work; Work [*] := 1 0 14 0 27 0 40 0 53 0 66 0 79 0 92 0 105 0 118 0 2 0 15 0 28 0 41 0 54 0 67 0 80 0 93 0 106 0 119 0 3 0 16 0 29 0 42 0 55 0 68 0 81 0 94 0 107 0 120 0 4 0 17 0 30 0 43 0 56 0 69 0 82 0 95 0 108 0 121 0 5 0 18 0 31 0 44 0 57 0 70 0 83 0 96 0 109 0 122 0 6 0 19 0 32 0 45 0 58 0 71 0 84 0 97 0 110 0 123 0 7 0 20 0 33 0 46 0 59 0 72 0 85 0 98 0 111 0 124 0 8 0 21 0 34 0 47 0 60 0 73 0 86 0 99 0 112 0 125 0 9 0 22 0 35 0 48 0 61 0 74 0 87 0 100 0 113 0 126 0 10 0 23 0 36 0 49 0 62 0 75 0 88 0 101 0 114 0 11 0 24 0 37 0 50 0 63 0 76 0 89 0 102 0 115 0 12 0 25 0 38 0 51 0 64 0 77 0 90 0 103 0 116 0 13 0 26 0 39 0 52 0 65 0 78 0 91 0 104 0 117 0 ;
Based on other tests with this problem, I believe that no solution is being returned, even though a feasible solution has been found. (When the time limit is removed, a solution is found in about 18 seconds.)
Fixed by commit above
When CBC hits a time limit set with
lim:time
, it displays an error message:AMPL's timing parameters show that the time limit was reached, but all zeros were returned for the variables:
Based on other tests with this problem, I believe that no solution is being returned, even though a feasible solution has been found. (When the time limit is removed, a solution is found in about 18 seconds.)