Re: [Help-glpk] GLPK just hangs

[Pavel Klinov]

Xypron,

Unfortunately, it's not straightforward. It also occurs inside my
column generator (each column is generated by optimizing a MIP
instance). I tried once to create a synthetic test by generating a
series of MIP instances but couldn't reproduce the behaviour.

I'll give it another try when I have time.

Thanks,
Pavel

On Fri, Sep 3, 2010 at 6:04 PM, Xypron <address@hidden> wrote:
> Hello Pavel,
>
> could you,please, supply an example to reproduce the behavior.
>
> Best regards
>
> Xypron
>
>
> Pavel Klinov wrote:
>>
>> Hello Xypron and others,
>>
>> I have also observed that behaviour (asked here [1]). The performance
>> can degrade quite seriously unless I reload the problem instance. I'd
>> appreciate if someone could suggest another way of performing the same
>> steps (rounding or whatever) but w/o writing/reading data on disk.
>>
>> Thanks,
>> Pavel
>>
>> On Fri, Sep 3, 2010 at 5:53 PM, Xypron<address@hidden>  wrote:
>>
>>>>>
>>>>> The weirdness is not that it just gets stuck in an infinite loop. The
>>>>> weird
>>>>> part is that it works fine if instead of calling
>>>>> lpx_simplex/lpx_integer
>>>>> on
>>>>> the problem that is already in memory, I write the problem to a file
>>>>> and
>>>>> load it again.
>>>>>
>>>
>>>
>>
>>
>
>



-- 
cheers,
--pavel
http://www.cs.man.ac.uk/~klinovp