[Ipopt] Run ipopt instance per thread for parallel computing

[Jonathan Hogg]

MA27 has been thread safe since 2001 - all state is held in the arguments.

Jonathan.

On 25/07/12 23:43, Damien wrote:
> All,
>
> The crashes on that ticket are probably caused by Fortran SAVE or 
> COMMON statements in the linear solvers.  MUMPS had them for sure, and 
> given how old MA27 is it probably does too.  There was some discussion 
> on the MUMPS list a while back about running multiple instances of 
> MUMPS, and if my memory serves me correctly it was done by wrapping 
> the SAVE statements with OMP THREADPRIVATE directives so that global 
> memory was separated for each instance. Since then MUMPS might have 
> been modified, I'll look through the old MUMPS list and try and find 
> the mail thread that had a working solution on it.
>
> Damien
>
> On 25/07/2012 3:41 PM, George Zhou wrote:
>>
>> Hi, All,
>>
>> https://projects.coin-or.org/Ipopt/ticket/167#comment:1,
>>
>> From Andreas's comments, I think the following two changes could make 
>> application run ipopt in parallel, as long each thread only access 
>> its own instance of ipopt
>>
>> 1)Declare ipopt as TLS variable. (per thread based)
>>
>> 2)In Ipopt/src/Common/IpTaggedObject.hpp, change the following two 
>> variables as TLS variable or atomic ones:
>>
>> static Tag unique_tag_;
>>
>> Tag tag_
>>
>> Anyone has successful story to run multiple instances of ipopt in one 
>> application?
>>
>> Thanks
>>
>> George
>>
>>
>>
>> ------------------------------------------------------------------------
>>
>> *  George Zhou**
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>>
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