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

[Andrew Wald]

Yeah I saw they were close, just didn't know if the wallclock was maybe
checked on a different frequency or perhaps on a separate thread.

On Mon, Jan 22, 2018 at 8:59 PM, Matthew Galati <matthew.galati at gmail.com>
wrote:

> Wall clock and cpu are pretty close here. I suspect CBC is just not
> checking maxtime often enough (inside some expensive operation).
>
> Sent from my iPhone
>
> On Jan 22, 2018, at 9:48 PM, Andrew Wald <andrewjohnwald at gmail.com> wrote:
>
> 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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>>
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