Response #1: 2005-08-14

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?
Sequential, Multi-core-thread, Distributed-shared-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?
Generalized eigenvalue, Symmetric eigenvalue

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

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 90/95

13. How could the LAPACK interface be improved to feel more natural to your application and implementation language?
remove user supplied workspace; do it automatically. More obvious (longer) routine names, although this might break f77 applications.

15. How frequently do you refer to the LAPACK Users Guide?
Never

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?
Vendor

5. If you have used both a vendors version of ScaLAPACK and Netlibs, how do the two versions compare?
Vendor supplied is faster, but more buggy.

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 90/95

13. How could the ScaLAPACK interface be improved to feel more natural to your application and implementation language?
Automated workspace, more obvious routine names.

15. How frequently do you refer to the ScaLAPACK Users Guide?
Never

Targeted Environment Specifics

1. Under which operating system environments do your applications run?
AIX, Linux, Mac OS X, Tru64

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

Additional Information