Bug 1144414

Summary:	Reenable special LAPACK functions
Product:	[Fedora] Fedora	Reporter:	Milan Bouchet-Valat <nalimilan>
Component:	openblas	Assignee:	Susi Lehtola <susi.lehtola>
Status:	CLOSED NOTABUG	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	20	CC:	susi.lehtola
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Last Closed:	2014-09-19 19:11:18 UTC	Type:	Bug
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Description Milan Bouchet-Valat 2014-09-19 10:37:22 UTC

Would it be possible to reenable the optimized LAPACK functions which are bundled in OpenBLAS? You apparently removed them when you found a bug, which has now been fixed since 0.2.7 [1][2].

I'm asking because of Julia user of my RPM package complained that Julia was slower than MATLAB, which was actually that the reference LAPACK was slower than Intel MKL.

Thanks!


1: https://bugzilla.redhat.com/show_bug.cgi?id=739398#c42
2: https://github.com/xianyi/OpenBLAS/issues/191

Comment 1 Susi Lehtola 2014-09-19 19:11:18 UTC

If you had bothered to look

* Tue Jul 23 2013 Susi Lehtola <jussilehtola> - 0.2.7-1
- Update to 0.2.7.
- Use OpenBLAS versions of LAPACK functions, as they seem to be
  working now.

* Mon Jul 08 2013 Susi Lehtola <jussilehtola> - 0.2.5-10
- Due to long standing bug, replace all OpenBLAS LAPACK functions with
  generic ones, so that package can finally be released in stable.

Comment 2 Milan Bouchet-Valat 2014-09-19 21:08:49 UTC

Ah sorry. Actually I had a look at git, but I didn't go so far in the past, as I hadn't noticed this bug fix was so old. And it look like the perfect explanation for my problem (the absence of threading). :-)

I've now realized I needed to link to libopenblasp if I want to enable threading. Would it be possible to get a very short explanation somewhere like /usr/share/doc/openblas/? Four lines would be enough:
- libopenblas.so provides the serial library
- libopenblasp.so provides a threaded library based on pthreads (built with USE_THREAD=1 USE_OPENMP=10)
- libopenblaso.so provides a threaded library based on OpenMP (built with USE_THREAD=1 USE_OPENMP=1)

libopenblas64.so, libopenblasp64.so and libopenblaso64.so offer the ILP64 versions of these libraries (built with INTERFACE64=1)

What I wrote is probably inaccurate, but I wanted to take my share of the work. Thanks!

Comment 3 Susi Lehtola 2014-09-19 22:08:00 UTC

That is already in the package descriptions.

Comment 4 Milan Bouchet-Valat 2014-09-20 09:50:42 UTC

Yeah, but for some reason I was looking for docs in /usr/share/doc, I hadn't even noticed there were several packages. I'd say it doesn't hurt to have information in two places.