run does not reset timers

[odow]

Each call to run does not reset the timers, so repeated calls (e.g., in a row or column generation scheme) eventually hit a time limit.

Notice how the HiGHS run time : keeps increasing each iteration, and eventually the time limit is hit:

julia> using HiGHS

julia> highs = Highs_create()
Ptr{Nothing} @0x00007fe078c24000

julia> Highs_readModel(highs, "/Users/Oscar/Downloads/bug.mps")  # Doesn't matter. Arbitrary model
Running HiGHS 1.5.3 [date: 1970-01-01, git hash: 45a127b78]
Copyright (c) 2023 HiGHS under MIT licence terms
0

julia> Highs_setIntOptionValue(highs, "time_limit", 1)
0

julia> for _ in 1:7
           println()
           Highs_run(highs)
       end

Iteration, Runtime, ObjVal, NullspaceDim
0, 0.019859, -0.684376, 0
1000, 0.126506, -196828.896682, 0
1152, 0.142994, -198524.875970, 0
Model   status      : Optimal
Simplex   iterations: 44
QP ASM    iterations: 1152
Objective value     : -1.9852487597e+05
HiGHS run time      :          0.14

Iteration, Runtime, ObjVal, NullspaceDim
0, 0.163659, -0.684376, 0
1000, 0.270918, -196828.896682, 0
1152, 0.286709, -198524.875970, 0
Model   status      : Optimal
Simplex   iterations: 44
QP ASM    iterations: 1152
Objective value     : -1.9852487597e+05
HiGHS run time      :          0.29

Iteration, Runtime, ObjVal, NullspaceDim
0, 0.305871, -0.684376, 0
1000, 0.420568, -196828.896682, 0
1152, 0.437243, -198524.875970, 0
Model   status      : Optimal
Simplex   iterations: 44
QP ASM    iterations: 1152
Objective value     : -1.9852487597e+05
HiGHS run time      :          0.44

Iteration, Runtime, ObjVal, NullspaceDim
0, 0.458031, -0.684376, 0
1000, 0.568664, -196828.896682, 0
1152, 0.584456, -198524.875970, 0
Model   status      : Optimal
Simplex   iterations: 44
QP ASM    iterations: 1152
Objective value     : -1.9852487597e+05
HiGHS run time      :          0.59

Iteration, Runtime, ObjVal, NullspaceDim
0, 0.605321, -0.684376, 0
1000, 0.725592, -196828.896682, 0
1152, 0.742359, -198524.875970, 0
Model   status      : Optimal
Simplex   iterations: 44
QP ASM    iterations: 1152
Objective value     : -1.9852487597e+05
HiGHS run time      :          0.74

Iteration, Runtime, ObjVal, NullspaceDim
0, 0.761806, -0.684376, 0
1000, 0.872029, -196828.896682, 0
1152, 0.887218, -198524.875970, 0
Model   status      : Optimal
Simplex   iterations: 44
QP ASM    iterations: 1152
Objective value     : -1.9852487597e+05
HiGHS run time      :          0.89

Iteration, Runtime, ObjVal, NullspaceDim
0, 0.905723, -0.684376, 0
866, 1.000070, -192414.057770, 0
Model   status      : Time limit reached
Simplex   iterations: 44
QP ASM    iterations: 866
Objective value     : -1.9241405777e+05
HiGHS run time      :          1.00

Reported jump-dev/HiGHS.jl#167.

[jajhall]

Yes, this is a feature to be changed in v2.0.

[odow]

Hmm. So perhaps we could add a call to zeroAllClocks in the C API, and then HiGHS.jl could call that to reset things?

[jajhall]

Yes, that's easily done.

[odow]

Okay I'll work up a PR.