[Coin-ipopt] Is Ipopt + MUMPS thread safe?

[Javier Pedrido]

Andreas,  Damien,

It works fine when using the HSL solver (it's a pity I cannot use it). I 
won't be solving very large NLPs and won't have lots of users solving the 
NLPs concurrently, so serializing the solving code does the trick for me (I 
just don't want the java app. server to die). Maybe some comment about this 
limitation can be added to the Ipopt documentation.

Best regards,
Javier

>From: Andreas Waechter <andreasw at watson.ibm.com>
>To: Damien Hocking <damien at khubla.com>
>CC: coin-ipopt at list.coin-or.org
>Subject: Re: Re: [Coin-ipopt] Is Ipopt + MUMPS thread safe?
>Date: Thu, 11 Oct 2007 12:49:14 -0400 (EDT)
>
>I wouldn't necessarily assume that Ipopt isn't threadsafe, at least the 
>goal was to have it threadsafe.
>
>Javier, could you try with Harwell's MA27 (that should be threadsafe the 
>way it is integrated in Ipopt) and see if that works?
>
>Thanks
>
>On Thu, 11 Oct 2007, Damien Hocking wrote:
>
>>I'm pretty sure IPOPT isn't thread-safe.  MUMPS definitely isn't.  If you 
>>want to run two separate solves in two threads, you need a separate 
>>instance of IPOPT in each thread.  Watch your BLAS and LAPACK libraries 
>>too, if they're old F77 codes, they might have things like SAVE 
>>statements, which means you should only run one instance in any process 
>>space.
>>
>>Damien
>>  _____
>>
>>From: Javier Pedrido [mailto:javierpedrido at hotmail.com]
>>To: coin-ipopt at list.coin-or.org
>>Sent: Thu, 11 Oct 2007 09:39:45 -0600
>>Subject: [Coin-ipopt] Is Ipopt + MUMPS thread safe?
>>
>>Hi,
>>
>>  I was trying the new Java interface and whenever I run it from 2 
>>different
>>  threads, Ipopt crashes. Ipopt uses MUMPS as linear solver and was 
>>compiled
>>  with g95/g++ and with ifort/cl. Both builds crash in multi-threaded
>>  environments. Am I doing something wrong or Ipopt/MUMPS are not thread 
>>safe?
>>
>>  Thanks in advance,
>>  Javier
>>
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