LAPACK and ScaLAPACK Survey Results - by response

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Response #1: 2005-09-01

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:

a. Single precision: Rarely
b. Double precision: Very Frequently
c. More than double precision: Never
d. Complex single precision: Rarely
e. Complex double precision: Sometimes
f. Complex, more than double precision: Never

3. What dense matrix sizes are most important or time-consuming for your application?
1,000s X 100s

4. Does your application come close to, or run out of memory on important problems?
No

5. Number of processors used for your application:

a. SMP: Less than 10
b. Distributed shared-memory: Less than 10
c. Distributed memory: Less than 10

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

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

a. User defined matrix types: Not useful
b. Using optional arguments in the language interface: Somewhat useful
c. Automatic memory allocation of the work space: Very useful
d. More complicated matrix data structures: Somewhat useful

9. Do your applications solve linear algebra problems of the type?
Linear positive definite systems, Banded linear systems, General 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?
Netlib

6. Do your applications make direct LAPACK calls?
Yes

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

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?
C, Fortran 77

14. If you have installed LAPACK yourself, how could the installation process be improved?
autoconfig!! Manually tweaking makefile options and manually installing the library is a pain. This would also allow for more reasonable shared library support. Also, go ahead a make a LAPACK 3.1 or 3.0.1 (or whatever you'd call it) release. Downloading the lapack-3.0 sources and then manually copying all of the patch files on top of the originals is a pain.

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?
Program samples would be nice. Especially from other languages.

ScaLAPACK Usage

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

2. If you do not use ScaLAPACK, why?
Not solving linear algebra

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, Solaris, Windows (cygwin)


Additional Information

7. Use DOE-lab resourcesNo








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