[Cbc] Cbc bug

[Haroldo Gambini Santos]

Hi,

I suggest to disable the lift-and-project cuts (remove the lift on).  
IMHO they are quite expensive to generate, this could be the reason of 
the solver hanging.

Cheers
On 26-02-2016 11:41, Haroldo Gambini Santos wrote:
>
>
> On 26-02-2016 10:21, See Chuen Teck wrote:
>> Hi,
>>
>> So sorry for the late message. I was waiting for cbc 2.98 to be 
>> release. Indeed, it works fine with default setting. However, when I 
>> used the below settings, cbc2.98 hangs.
>>
>> heur off
>> cuts on
>> reduce on
>> zero on
>> lift on
>> branch
>>
>> On 16/1/2016 2:25 AM, Haroldo Gambini Santos wrote:
>>> Hi,
>>>
>>> I'm doing tests with your MIP here and the error does not occurred.
>>>
>>> I'm using the current CBC 2.9 stable (with will become CBC 2.98),  
>>> you can download it with:
>>> svn co https://projects.coin-or.org/svn/Cbc/stable/2.9 coin-Cbc
>>>
>>> Could you try with this new release ?  Some fixes were made since 
>>> 2.97...
>>>
>>> Cheers,
>>>
>>> Haroldo
>>>
>>> On 15-01-2016 10:57, See Chuen Teck wrote:
>>>> Hi Cbc,
>>>>
>>>> I encountered the below with the attached mps file (in zip format). 
>>>> I used cbc 2.9.7 on linux machine.
>>>>
>>>>
>>>> Cbc0010I After 192500 nodes, 103 on tree, 1e+50 best solution, best 
>>>> possible 40 (4425.69 seconds)
>>>> Cbc0010I After 192600 nodes, 96 on tree, 1e+50 best solution, best 
>>>> possible 40 (4428.60 seconds)
>>>> Cbc0010I After 192700 nodes, 96 on tree, 1e+50 best solution, best 
>>>> possible 40 (4431.18 seconds)
>>>> Cbc0010I After 192800 nodes, 92 on tree, 1e+50 best solution, best 
>>>> possible 40 (4433.39 seconds)
>>>> Cbc0010I After 192900 nodes, 96 on tree, 1e+50 best solution, best 
>>>> possible 40 (4435.83 seconds)
>>>> Cbc0010I After 193000 nodes, 96 on tree, 1e+50 best solution, best 
>>>> possible 40 (4438.38 seconds)
>>>> Segmentation fault (core dumped)
>>>>
>>>>
>>>> _______________________________________________
>>>> Cbc mailing list
>>>> Cbc at list.coin-or.org
>>>> http://list.coin-or.org/mailman/listinfo/cbc
>>>
>>> -- 
>>> ==================================================
>>> Haroldo Gambini Santos
>>> D.Sc, Computer Science
>>> Universidade Federal de Ouro Preto
>>> http://www.decom.ufop.br/haroldo/
>>
>
> -- 
> ==================================================
> Haroldo Gambini Santos
> D.Sc, Computer Science
> Universidade Federal de Ouro Preto
> http://www.decom.ufop.br/haroldo/

-- 
==================================================
Haroldo Gambini Santos
D.Sc, Computer Science
Universidade Federal de Ouro Preto
http://www.decom.ufop.br/haroldo/

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