[Ipopt] Run ipopt instance per thread for parallel computing

[Damien]

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
>
>
>
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