Response #1: 2005-08-15

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?
100,000s X 100,000s

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, Distributed-memory

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, General linear systems, Symmetric eigenvalue, Least-square problems

LAPACK Usage

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

3. If using another package, which one(s)?
FLAME

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

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?
Yes

11. From which languages do you call LAPACK routines?
C

12. Please describe any tools or helper functions that you frequently implement to assist your applications in using LAPACK?
explicit prototypes

13. How could the LAPACK interface be improved to feel more natural to your application and implementation language?
simplifying the indexing

14. If you have installed LAPACK yourself, how could the installation process be improved?
it always worked fine for me

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

16. What information in the LAPACK guide is hard to find or is missing, if any?
a precise description of the algorithm

ScaLAPACK Usage

1. Do you use ScaLAPACK (or a vendor version of ScaLAPACK )?
No

2. If you do not use ScaLAPACK, why?
Cost of learning

3. If using another package, which one(s)?
PLAPACK

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?
No

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?
Yes

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

Targeted Environment Specifics

1. Under which operating system environments do your applications run?
Linux

2. If your applications run in a shared-memory environment, which styles of parallelism do they employ?
Platform threading

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

3. If your applications run in a distributed-memory environment, which styles of parallelism do they employ?
Message passing

3a. Please specify any particular libraries of frameworks used?
MPI