[Fwd: RE: Is JAMA thread-safe]

[Ron Boisvert <boisvert@nist.gov>]

Sender: kazar001@umn.edu
Subject: RE: Is JAMA thread-safe


BLAS has a parallel (MPI & OMP) library called PBLAS. 
http://www.msi.umn.edu/cgi-bin/soft/software_detail.html?id=308&lab_id=&subject_id= 
however, not sure they include everything in BLAS. however, we had parallel 
RNG's in PBLAS. thanks, baris kazar


On Oct 10 2006, G. W. (Pete) Stewart wrote:

>If Jama was not designed with thread safety in mind, it probably is
>not.  But if the LAPACK experience is typical, it probably would not
>be hard to make it so.  LAPACK has few routines that SAVE information
>in static variables, which is thread dangerous.  It has no COMMON
>statements, so it does not modify global variables, another dangerous
>practice.  Since some vendors have offered thread-safe versions of
>LAPACK, its fair to conclude there are work-arounds for the few
>routines that have SAVE variables.
>
>The reference implementation of the BLAS, which LAPACK uses, appears
>to be thread safe.  But that is no guarantee that vendor implemented
>BLAS are also thread safe.
>
>I forget if Jama has random matrix generators, but those could be a
>problem, since they must save a seed.  A web search gave conflicting
>opinions on the thread safety of Java's random number generators.
>
>Pete Stewart
>
>On Mon, 9 Oct 2006, Cleve Moler wrote:
>
>> Date: Mon, 9 Oct 2006 18:27:26 -0400 (EDT)
>> From: Cleve Moler <moler@mathworks.com>
>> Reply-To: jama@nist.gov
>> To: Multiple recipients of list <jama@nist.gov>
>> Subject: RE: Is JAMA thread-safe
>>
>> I certainly never considered that issue when I wrote much of the code a
>> few years ago.  What does it take to make it thread safe?
>>
>>   -- Cleve Moler
>>      The MathWorks
>>
>> -----Original Message-----
>> From: jama@nist.gov [mailto:jama@nist.gov] On Behalf Of Geri Wagner
>> Sent: Monday, October 09, 2006 10:27 AM
>> To: Multiple recipients of list
>> Subject: Is JAMA thread-safe
>>
>> Hi
>>
>> I wonder whether the JAMA implementation is thread-safe.
>>
>> I could not find a statetment on the website, but perhaps I have
>> overlooked it. Thank you for comments.
>>
>> --
>> ----------------------------------------
>> Dr. Geri Wagner
>> Quantitative Analyst
>> ----------------------------------------
>> Swissrisk AG
>> Raeffelstr. 32, 8045 Zuerich Switzerland
>> t: +41 44 455 70 00
>> f: +41 44 455 70 01
>> m: +41 79 706 72 33
>> www.swissrisk.com
>> ----------------------------------------
>>
>>
>>
>> ----- End forwarded message -----
>>
>>
>>
>>
>>
>>
>> ----- End forwarded message -----
>>
>>
>>
>
>
>
>