Response #1: 2005-10-28

General

1. Is dense linear algebra a performance bottleneck in your applications?
Yes

2. How often do your applications use the arithmetic precisions listed below:

3. What dense matrix sizes are most important or time-consuming for your application?
10,000s X 10,000s

4. Does your application come close to, or run out of memory on important problems?
Yes

5. Number of processors used for your application:

6. Which architectures do you use or intend to use in the next three years?
Multi-core-thread, Symmetric-multi-procs, Vector-computers, Distributed-memory, Widely-distributed

7. Do you use any other sequential or parallel dense linear algebra packages other than LAPACK or ScaLAPACK?
plapack

8. Please rank how the following features would be useful to your current or planned applications?

9. Do your applications solve linear algebra problems of the type?
Linear positive definite systems, Banded linear systems, Symmetric eigenvalue, Least-square problems

LAPACK Usage

1. Do you use LAPACK (or a vendor version of LAPACK )?
Yes

4. If you use LAPACK, do you use a vendors version or one obtained directly from Netlib?
Vendor, Netlib

5. If you have used both a vendors version of LAPACK and Netlibs, how do the two versions compare?
I use MKL provided by Intel. Level 2 BLAS routines from MKL are faster than

6. Do your applications make direct LAPACK calls?
Yes

7. Do your applications use libraries which depend on LAPACK?
Yes

8. Do your applications use a higher-level interface to LAPACK?
No

10. Is the LAPACK procedure interface a barrier to more extensive use?
No

11. From which languages do you call LAPACK routines?
Fortran 77, Fortran 90/95

12. Please describe any tools or helper functions that you frequently implement to assist your applications in using LAPACK?
I have not implemented such tools. I think that the use of lapack routines is quite simple.

13. How could the LAPACK interface be improved to feel more natural to your application and implementation language?
I think it is not necessary to make such improvements.

14. If you have installed LAPACK yourself, how could the installation process be improved?
One could consider to provide makefiles for some popular platforms and compilers like Intel compilers.

15. How frequently do you refer to the LAPACK Users Guide?
Very Frequently

ScaLAPACK Usage

1. Do you use ScaLAPACK (or a vendor version of ScaLAPACK )?
Yes

4. If you use ScaLAPACK, do you use a vendors version or one obtained directly from Netlib?
Netlib

6. Do your applications make direct ScaLAPACK calls?
Yes

7. Do your applications use libraries which depend on ScaLAPACK?
No

8. Do your applications use a higher-level interface to ScaLAPACK?
No

10. Is the ScaLAPACK procedure interface a barrier to more extensive use?
No

11. From which languages do you call ScaLAPACK routines?
Fortran 77

13. How could the ScaLAPACK interface be improved to feel more natural to your application and implementation language?
I think that the use of block cyclic distribution of dense matrices is a little bit complicated. Thus it woluld be nice to find routines that assist do distribute matrics.

14. If you have installed ScaLAPACK yourself, how could the installation process be improved?
The collection of makefiles could be extended.

15. How frequently do you refer to the ScaLAPACK Users Guide?
Very Frequently

Targeted Environment Specifics

1. Under which operating system environments do your applications run?
HP/UX, Linux, Unicos

2a. Please specify any particular libraries of frameworks used?
phtread

Additional Information