[Cbc] setting setUseElapsedTime caused RINS to immediately time out

[Fei Peng]

Perfect. Thanks John!


> On Jan 29, 2015, at 12:59 PM, John Forrest <john.forrest at fastercoin.com> wrote:
> 
> Fei,
> 
> Fixed in trunk and stable/2.9.
> 
> If you need it in 2.8, it is only a two line change - look at the changeset for 2.9
> 
> John Forrest
>> On 28/01/15 16:30, fpeng wrote:
>> Hello Cbc community,
>> 
>> I'm seeing an issue when using wall time instead of cputime in CBC: after calling setUseElapsedTime(true) (which should make cbc use wall time instead of the default cpu time), all RINS runs during cbc branchandbound will time out almost immediately, something like:
>> 
>> Cbc0028I Starting sub-tree for CbcHeuristicRINS - maximum nodes 200
>> Cbc0020I Exiting on maximum time
>> Cbc0005I Partial search - best objective 1e+50 (best possible -391348.59), took 0 iterations and 0 nodes (1422388648.51 seconds)
>> Cbc0035I Maximum depth 0, 0 variables fixed on reduced cost
>> Cbc0029I Ending sub-tree for CbcHeuristicRINS
>> Cbc0045I Heuristic RINS took 0.139259 seconds (no good)
>> 
>> although the rest of the cbc run seems normal and uses the correct wall time to terminate without a problem. I used the default RINS and didn't change any settings. I believe RINS smallbranchandbound is using the main branchandbound routine, so it's perplexing to see the time handled incorrectly here.
>> 
>> Some background: the reason I wanted to use wall time is that cpu time doesn't translate to wall time very well in parallel: if I have multiple cores, setting setMaximumSeconds(tLim*numCores) doesn't always terminate cbc after tLim seconds, and sometimes I get vastly different termination times. If anyone knows what's happening here please let me know.
>> 
>> Thanks!
>> Fei
>> 
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