[Cbc] two minor issues in cbc (maxtime and log)

[Andrew Wald]

Hi Matthew,

It seems like your problem is pretty large and spent a lot of time
pre-processing...

Not sure if this will help since I don't have your files to test, but this
might be something to try. What about constraining by the wall clock like
this when you call it up:
cbc -solve -quit -seconds 1300 -timeMode elapsed

- Andrew


On Mon, Jan 22, 2018 at 8:06 PM, Matthew Galati <Matthew.Galati at sas.com>
wrote:

> Two minor issues. This is through the C++ CBCModel API using the latest
> CBC.
>
>
>
>    1. I set max time (1300 seconds), but CBC did not stop until after
>    19,900 seconds.
>    2. This is a maximization problem, but the final summary states “Lower
>    bound” for the bound. It might be cleaner to just say “bound” – to avoid
>    confusion.
>
>
>
> command line - cbc -solve -quit -seconds 1300 (default strategy 1)
>
> Continuous objective value is 1.88508e+09 - 855.75 seconds
>
> Cgl0005I 998000 SOS with 13941976 members
>
> Cgl0004I processed model has 999000 rows, 13941976 columns (13941976
> integer (13
>                           941976 of which binary)) and 26887952 elements
>
> Cutoff increment increased from 1e-05 to 0.9999
>
> Cbc0020I Exiting on maximum time
>
> Cbc0005I Partial search - best objective 1e+50 (best possible
> -1.885078e+09), to
>                                              ok 0 iterations and 0 nodes
> (19624.31 seconds)
>
> Cbc0035I Maximum depth 0, 0 variables fixed on reduced cost
>
> Cuts at root node changed objective from -1.88508e+09 to -1.88508e+09
>
> Probing was tried 0 times and created 0 cuts of which 0 were active after
> adding
>                                             rounds of cuts (0.000 seconds)
>
> Gomory was tried 0 times and created 0 cuts of which 0 were active after
> adding
>                                             rounds of cuts (0.000 seconds)
>
> Knapsack was tried 0 times and created 0 cuts of which 0 were active after
> addin
>                                                 g rounds of cuts (0.000
> seconds)
>
> Clique was tried 0 times and created 0 cuts of which 0 were active after
> adding
>                                 rounds of cuts (0.000 seconds)
>
> MixedIntegerRounding2 was tried 0 times and created 0 cuts of which 0 were
> activ
>                                           e after adding rounds of cuts
> (0.000 seconds)
>
> FlowCover was tried 0 times and created 0 cuts of which 0 were active
> after addi
>                                          ng rounds of cuts (0.000 seconds)
>
> TwoMirCuts was tried 0 times and created 0 cuts of which 0 were active
> after add
>                                         ing rounds of cuts (0.000 seconds)
>
>
>
> Result - Stopped on time limit
>
>
>
> No feasible solution found
>
> Lower bound:                    1885078031.000
>
> Enumerated nodes:               0
>
> Total iterations:               0
>
> Time (CPU seconds):             19928.34
>
> Time (Wallclock seconds):       19973.07
>
>
>
> Total time (CPU seconds):       19930.87   (Wallclock seconds):
> 19975.64
>
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