LAPACK and ScaLAPACK Survey Results - by response

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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:

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

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

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

5. Number of processors used for your application:

a. SMP:
b. Distributed shared-memory:
c. Distributed memory: More than 100

6. Which architectures do you use or intend to use in the next three years?
Distributed-memory

7. Do you use any other sequential or parallel dense linear algebra packages other than LAPACK or ScaLAPACK?
no

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

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

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

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?
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?
C, Fortran 77

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

12. Please describe any tools or helper functions that you frequently implement to assist your applications in using ScaLAPACK?
different data distribution models

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

Targeted Environment Specifics

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

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









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